十年探索

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中国古代史重要大事年表：十年探索时期

中国古代史重要大事年表：十年探索时期
1956年——三大改造完成，社会主义制度基本建立，由此进入社会主义初级阶段、
1958年之后——少数民族先后进入社会主义社会
1956年——毛泽东发表《论十大关系》，中共由此开始探索建设社会主义
1956年秋——中共八大召开
1957年——武汉长江大桥建成
1957年春——毛泽东发表《关于正确处理人民内部矛盾》
1957年——整风运动（反官僚主义、反宗派主义、反主观主义）
1957年——反右派斗争扩大化
1958年——党中央提出"鼓足干劲,力争上游,多快好省地建设社会主义"的总路线、开展了大跃进、人民公社化运动
1958年的三面红旗——总路线、大跃进、人民公社化
1959年夏——庐山会议引发“反右倾运动”，彭德怀等人遭到错误批判
1959年到1961年——三年自然灾害
1960年冬——党中央开始纠正农村工作中的“左”倾错误
1961年——党和政府提出“八字方针”，全面调整国民经济,恢复发展生产
1962年初——七千人大会，初步总结“大跃进”以来的经验教训
1964年——国民经济调整任务基本完成
1964年10月16日——我国第一颗原子弹爆炸成功
1965年——实现石油自给
十年探索重大项目：二钢三油（武钢、包钢、大庆油田、大港油田、胜利油田）
原子弹、结晶牛胰岛素，兰新、包兰、成昆铁路（1958～1970）
历史知识点总结第 1 页共1 页。

社会主义建设的十年探索

中共八大的主要内容
1、主要矛盾的变化：人民对于经济文化迅速发展的需要和当前经济文化不能满足人民需要的状况之间的矛盾
2、工作重心：经济建设
3、经济建设方针：既反保守又反冒进，在综合平衡中稳步前进
评价
八大的路线、方针是正确的，是党在我国社会主义时期对马克思列宁主义的创造性的运用，也是毛泽东思想的新发展，为新时期社会主义事业的发展和党的建设指明了方向。但是……八大以后，我们党的指导思想上发生了“左” 倾错误，八大提出的路线和许多正确的方针、意见没有能够在实践中坚持下去。
国民经济调整的成就
工农业生产恢复状况：(比上一年增长) 农业 1962年 6.2% 1963年 11.6% 1964年 13.5% 8.5% 19.6% 工业
新中国石油工业发展
——原油产量增加状况 1949年 12万吨
1957年
1960年
146万吨
520万吨
31.5万吨
*突出表现：工业——大炼钢铁运动
农业——追求粮食高产
工业：“以钢为纲”，要在七年、五年、甚至三年内达到原定十五年的钢产量。农业：“以粮为纲”，要在一、二年内达到原定十二年的指标。
毛泽东在中南海观看工作人员炼钢
妇女们在利用土高炉炼钢
农民放弃耕作，上山采矿，建土高炉
2、“大跃进”
*时间： 1958年 *特点：追求工农业生产的高速度，不断提高计划指标
1957年产量
钢铁： 535万吨
粮食：1950亿公斤
北戴河会议计划产量 1958年钢铁：1070万吨粮食：3500亿公斤 1959年 3000万吨
不切实际的高指标
“大跃进”和人民公社化运动

第2课社会主义道路的探索

中国对社会主义道路的探索
主要成就： 1、三大改造完成，社会主义制度确立
2、十年探索（1956—1966）：第一颗原子弹、氢弹 3、1978年十一届三中全会改革开放；失误表现：1958年大跃进、人民公社化运动、文化大革命失误原因：照搬苏联模式；忽视本国国情；急于求成经验教训：立足国情，制定适合国情的政策，实事求是；经济发展一定要符合客观规律
课堂探究「1」
列宁曾说：“我们计划……用无产阶级国家直接下命令的办法在一个小农国家里按共产主义原则来调整国家的产品生产和分配。现实生活说明我们错了。”请你据此回答下列问题：（1）“用无产阶级国家直接下命令的办法”指的是什么政策？战时共产主义政策。（2）列宁说这话时，苏俄发生了怎样的变化？国内战争已经结束，苏俄进入和平建设时期。战时共产主义政策日益引起不满。（3）针对这种形势，列宁做出了怎样的探索？（或：列宁是怎样纠正错误的？）取得什么成效？ 1921年开始实施新经济政策，允许多种经济并存，大力发展商品经济。促进了国民经济的恢复和发展。
教
训：
1、发展重工业的同时，一定要兼顾农业和轻工业的发展 2、经济发展要遵循客观规律 3、切实维护广大农民的利益，注意提高农民的生产积极性 4、保护环境，提倡可持续发展，注重经济效益 5、政治上防止个人专断，切实加强民主与法制建设
如何评价斯大林模式？
在一定的历史阶段里发挥过积极的作用，但从长远看，它严重阻碍了苏联的进一步发展。
一、列宁对社会主义建设道路的探索——（一）新经济政策的实施
1、新经济政策制定的背景 1918——1920年三年国内战争结束后，苏俄进入和平建设时期，战时共产主义已经不适应经济发展的要求了。 2、时间、主要内容（或特点）： 1921年；允许多种经济并存，大力发展商品经济 3、作用是什么？促进国民经济的恢复和发展，到1927年国民经济恢复到战前1913年的水平

1956年到1966年十年探索时期社会主义建设

（07年江苏卷）阅读下列材料：材料一改变生产资料私有制为社会主义公有制这个极其复杂和困难的历史任务。现在在我国已经基本上完成了。我国社会主义和资本主义谁战胜谁的问题，现在已经解决了。 ——刘少奇《在中国共产党第八次全国代表大会上的政治报告》材料二 (中共 )八大报告所阐述的一些经济建设的重要方针，因为有“一五”计划的经验与教训作借鉴，所以比较适合社会主义改造完成后我国经济工作的实际。 ——石仲泉等《中共八大史》材料三八大的路线是正确的。但是……没有能够在实践中坚持下去。八大以后，我们取得了社会主义建设的许多成就，同时也遭到了严重挫折。 ——《邓小平文选》材料四（中国共产党十一届）三中全会以后，我们……就是准确地，完整地学习和运用毛泽东思想嘛。基本点还是那些。从许多方面来说，现在我们还是把毛泽东同志已经提出、但是没有做的事情做起来，把他反对错了的改正过来，把他没有做好的事情做好……。当然，我们也有发展，而且还要继续发展。 ——《邓小平文选》请回答： ①依据材料一、材料二，概括八大路线形成的重要背景。（3分 ) ②“八大”对当时国内主要任务和经济建设方针是怎样阐述的?八大路线的意义是什么?(4分 ) ③材料三中提到八大路线“没有能够在实践中坚持下去”，社会主义建设遭到“严重挫折”。指出20世纪50年代经济工作遭到“严重挫折”的具体表现及原因。(4分 ) ④八大路线是毛泽东思想的重要内容。依据材料四，指出邓小平理论的形成与八大路线之间的关系。（2分 )
——齐鹏飞《中华人民共和国史》
中共八大的主要内容
生产资料私有制的社会主义改造基本完成后，国内的主要矛盾不再是工人阶级和资产阶级之间的矛盾，而是 ……。这一矛盾的实质，在中国社会主义制度已经建立的情况下，也就是先进的社会主义制度同落后的社会生产之间的矛盾。党和全国人民当前的主要任务，就是要集中力量解决这个矛盾，把我国尽快地从落后的农业国变为先进的工业国。所谓综合平衡，包括农业和工业的平衡、重工业和轻工业的平衡、积累和消费的平衡，以及工业内部的平衡等。

Shibor 十年：探索与实践

Shibor十年：探索与实践为推进利率市场化改革，健全市场化利率形成和传导机制，培育货币市场基准利率，中国人民银行于2007年正式推出了上海银行间同业拆借利率（Shibor）。

十年来，在有关各方的共同努力下，Shibor已经成长为我国认可度较高、应用较广泛的货币市场基准利率之一。

首先，Shibor基准性明显提升，比较有效地反映了市场流动性松紧。

短端Shibor与拆借、回购交易利率的相关性均在80%以上，并维持较窄价差，其中隔夜Shibor与隔夜拆借、回购交易利率的相关性高达98%；中长端Shibor得益于同业存单市场的发展壮大，基准性也有显著增加，Shibor3M与3个月同业存单发行利率的相关系数高达95%。

其次，Shibor产品创新取得进展，应用范围不断扩大。

目前Shibor已被应用于货币、债券、衍生品等各个层次的金融产品定价，部分商业银行也依托Shibor建立了较完善的内部转移定价（FTP）机制，金融体系内以Shibor为基准的定价模式已较为普遍。

再次，Shibor与实体经济联系日趋紧密，越来越多地发挥了传导货币政策和优化资源配置的作用。

通过Shibor挂钩理财产品、Shibor浮息债、非金融企业参与的Shibor利率互换交易等渠道，Shibor较好地将货币政策信号传导至实体经济，并随着直接融资比重提升和多层次资本市场建立完善，进一步发挥优化资源配置的作用。

Shibor的创设借鉴了伦敦银行间同业拆借利率（Libor）等国际基准利率。

2012年以来，由于国际金融危机后无担保拆借市场规模有所下降，以及部分报价行操纵Libor报价案件等原因，国际社会开始着手改革以Libor为代表的金融市场基准利率体系。

2017年7月，英国金融行为管理局（FCA）宣布将从2021年起不再强制要求Libor报价行开展报价，届时Libor可能不复存在，未来英国将逐步转向基于实际交易数据的SONIA（英镑隔夜平均利率）作为英镑市场基准利率。

高中历史：社会主义十年探索

社会主义十年探索【学习目标】了解社会主义十年探索时期我国所取得的主要成就和出现的问题。

【知识概述】一、“一五”计划1．时间：1953年～1957年（超额完成）2．指导方针：过渡时期总路线（社会主义建设与改造同时并举）3．基本任务：集中主要力量发展重工业，建立国家工业化的初步基础；有步骤地对农业、手工业和资本主义工商业进行社会主义改造（一化三改）。

4．特点：优先发展重工业5．成就：鞍山钢铁公司三大工厂、长春第一汽车制造厂、沈阳机床厂和飞机制造厂等。

6．作用：改变了我国工业落后面貌，为社会主义工业化奠定初步基础。

二、三大改造1．时间：1953﹣1956年2．含义：对农业、手工业、资本主义工商业的社会主义改造。

3．改造途径：（1）农业、手工业：建立生产合作社，走集体化道路；（2）资本主义工商业：先采用公私合营，最后实行“和平赎买”政策。

4．意义：实现了生产资料私有制向公有制的转变；标志着社会主义制度在中国基本建立，中国开始进入社会主义初级阶段。

5．存在问题：改造后期，存在要求过急、改变过快，形式过于简单划一等缺点。

三、中共八大：探索开端1．背景：社会主义制度在中国基本确立。

2．时间：1956年9月3．主要内容：（1）主要矛盾：是人民对于建立先进工业国的要求同落后的农业国的现实之间的矛盾，是人民对于经济文化迅速发展的需要同当前经济文化不能满足人民需要的状况之间的矛盾。

（先进的社会制度同落后的社会生产力之间的矛盾）（2）主要任务：是把中国尽快地从落后的农业国变为先进的工业国。

4．意义：是对我国建设社会主义道路的一次成功探索。

四、大跃进和人民公社化运动1．原因：由于中国的社会主义实践刚刚起步，人们对于什么是社会主义、如何建设社会主义等问题在理论和思想上缺乏深刻认识，从而导致社会主义道路的探索过程开始出现曲折和失误。

2．开展：1958年，在急于求成和片面强调经济建设发展速度的错误思想指导，“大跃进”运动在全国范围内展开，接着全国农村大办人民公社。

对十年探索的评价及认识

对十年探索的评价及认识
(1)评价：1956~1966年这十年的探索是“两头好，中间差”，其整体特征是社会主义经济建设在探索中曲折前进，主流是前进的。

这是因为经济建设这个中心尚未转移，工作的失误尚局限于局部，错误延续的时间只集中在1958—1960年，错误还是在探索这个前提下出现的。

(2)认识：①凡是党和国家的方针政策能正确反映并适合中国国情时，就能推动建设事业的发展，反之则会遭到挫折和失败。

②社会主义经济建设必须自觉地按照客观规律办事，违背经济规律，就会受到惩罚。

③实事求是，一切从实际出发是党一贯的思想路线。

④在经济工作中有什么倾向就应当反对什么倾向，不能只反右不反“左”。

⑤从建设中遇到的挫折使我们认识了社会主义建设的长期性、艰巨性、复杂性，而所取得的成就更加坚定了我们建设有中国特色社会主义的信念。

⑥从曲折中取得的成就使我们认识到我们党是一个伟大的党，敢于正视并改正自身的错误，有能力解决自己的问题，社会主义具有强大的生命力，是任何反动势力都推翻不了的。

年到年十年探索时期社会主义建设

——张岂之主编《中国历史·中华人民共和国卷》
建设社会主义总路线的评价
这条总路线把实现现代化作为建设我国社会主义的宏伟目标，反映了广大人民群众迫切要求改变国家经济文化落后状况的普遍愿望。它的缺点是过分夸大主观意志和主观努力，忽视了客观经济规律，片面地追求经济建设的发展速度，否定了国民经济发展必须力求实现综合平衡。会后，《人民日报》在公布总路线时所发社论就宣称：“速度是总路线的灵魂”，“快，这是多快好省的中心环节。”
社会主义建设总路线的提出
1957年11月，中共中央派出以毛泽东为首的代表团，出席在莫斯科举行的十月革命40周年庆典和各国共产党工人党代表大会。苏联领导人赫鲁晓夫在莫斯科的庆祝大会上宣布，通过和平竞赛，苏联要在今后15年内，不仅赶上并且超过美国。受此影响，毛泽东在18日的会议发言中也提出中国15年赶上和超过英国的目标。
——何沁《中华人民共和国史》
3年经济困难局面为何出现？如何改变的？
“大跃进”运动的最大失误是在建设速度上急于求成，人民公社化运动的最大失误是在所有制关系上盲目求纯。两者共同的教训，归根到底，是限于当时对社会主义的认识，脱离了中国社会生产力发展水平的现实，违背了经济和社会发展的客观规律。
调整、巩固、充实、提高—促进经济的恢复和发展
中共八大召开的背景
中共八大召开之际，中国刚刚完成对农业、手工业和资本主义工商业的社会主义改造，建立起了社会主义的基本制度。如何尽快建成强大的社会主义国家，自然成为中共和中国人民最主要的历史任务。与此同时，先于中国建立社会主义制度的苏联和东欧诸国，在社会主义建设过程中遇到了一系列问题和困难。如何汲取苏东国家的教训，闯出一条适合中国国情的社会主义建设道路，是中共八大面临的一个挑战。

十年探索

全面建设社会主义的十年（1956―1966年）（一）1956年－1966年历史阶段中的几个问题1、阶段特征：在探索中曲折前进（1）在探索建设社会主义的道路中有正确的决策，也出现了指导方针上的严重失误，但能有错必纠，时错时纠，经历了一段曲折发展的过程，仍然取得了很大的成就。

（2）指导思想上的“左”倾错误没有得到清理和纠正。

政治、思想、文化方面的“左”倾错误还有发展，虽尚未发展到支配全局的程度，但却为文革十年的严重错误埋下了伏笔。

2、1956年中共开始探索本国建设社会主义道路的历史条件。

（1）三大改造完成，社会主义制度在我国基本确立。

（2）一五计划顺利实施，经济建设取得重大成就。

（3）苏共二十大后，国际共产主义运动面临巨大困难，中共开始破除对苏联经验的迷信。

（4）中国周边环境相对安定。

3、1956－1966年十年探索时期主要面临的两大问题。

（1）社会主义制度建立过后国内的主要矛盾问题。

（2）社会主义经济建设的指导方针问题。

（二）1956－1966年关于建设社会主义的正确的探索：1、《论十大关系》1956《论十大关系》标志着中共探索本国社会主义建设道路的开始，是中共八大召开的理论基础。

它是中共借鉴苏联经验并结合中国实际情况探索建设社会主义道路的产物，说明我国进行社会主义建设时十分注重遵循客观发展规律，走符合本国国情的道路。

2、中共八大：1956年（1）内容：①分析中国社会的主要矛盾：即先进的社会制度同落后的社会生产力之间的矛盾②主要任务：集中力量把我国由落后的农业国变为先进的工业国。

③方法途径：团结国内外一切可以团结的力量；经济建设指导方针：既反保守又反冒进，在综合平衡中稳步前进。

（2）意义：八大提出的许多方针和设想富有创造性，是对我国自己的建设社会主义道路的一次成功探索。

它不仅在十年建设中起到了重要作用，而且十一届三中全会的精神在很大程度上是对八大精神的继承。

3、正确处理人民内部矛盾（1）毛泽东《关于正确处理人民内部矛盾的问题》背景：社会主义改造完成以后，国内敌我矛盾基本解决，人民内部矛盾突出。

局部解剖学课程建设十年探索与实践

中图分类号：Ｒ３２２文献标志码：Ａ文章编号：２０９５－１４５０（２０１９）０５－０３３９－０３ＤＯＩ：１０．１３７５４／ｊ．ｉｓｓｎ２０９５－１４５０．２０１９．０５．０１
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十年探索课件

社会主义建设在
探索中曲折发展
1956--1966
一.正确的探索
1.《论十大关系》的发表
意义：标志着探索建设社会主义道路的开始。
为中共八大的召开做了思想上、理论上的准备。
目的：为调动一切积极因素，开展社会主义建设。
2.中共八大的召开
时间： 1956年
地点：北京
主要总任务：尽快把我国由农业国变为工业国，内集中力量建设社会主义。容经济建设方针：既反保守，又反冒进，
意义：对中国社会主要矛盾作了正确分析，制
定了符合中国国情的经济建设方针。
主要矛盾：人民日益增长的物质文化需要同落后的社会生产之间的矛盾。
在综合平衡中稳步前进。
对以后探索建设有中国特色的社会主义
道路起着深远的影响。
时间：主要内容
3.《关于正确处理人民内部矛盾问题》的发表 1957年春
②把正确处理人民内部矛盾作为国家政
三.探索中发展——国民经济的调整
1.调整过程：
时间：1962年
A:调整政策：调整、巩固、充实、提高（八字方针）
①初步总结了”大跃进
B:七千人大会
“中的经验教训。
内容 ②毛泽东带头做自我批评。
③为“反右倾“运动中被
错误批判的人平反。
2.调整效果：
从1962年起，经济逐步恢复发展，到1964年，国
民经济调整任务基本完成。
党中央的这些措施，鼓舞了全党和全国人民，
四.经济建设成就
武汉、包头两大钢铁基地建成。
工业建设大庆、胜利、大港油田建成。
电子工业增长很快。
交通运输业：兰新、包兰铁路建成。
1964年成功试验了第一颗原子弹。

“石柱模式”：-校地产学研合作十年探索

“石柱模式”：校地产学研合作十年探索一边是全国重点大学，一边是少数民族地区国家扶贫开发工作重点县。

西南大学与重庆市石柱土家族自治县10年深度合作，成功实现了地方脱贫致富奔小康和大学教学科研上台阶的共赢。

地方借助校地合作走出了一条依靠科技助推县域经济腾飞的富民强县之路，大学通过校地合作走出了一条服务社会与自身同步发展的兴校育人之路。

一、时代背景：高校服务社会的职责要求，地方对科技的急切需求石柱土家族自治县位于重庆东南部，是三峡库区唯一的少数民族自治县，也是国家扶贫开发重点县。

当地农业资源丰富，但由于自然条件的制约，交通不便，更兼科技力量薄弱，人才资源匮乏，导致经济发展水平较低，农业发展能力不强，农民收入水平不高。

2003年，全县农民人均纯收入仅为1686元。

石柱县意识到：“要在国家新的发展战略中抓住难得的发展机遇，实现经济社会的跨越发展，必须在依靠科技进步带动产业发展上狠下功夫；必须充分发挥资源优势，运用科技成果，延长产业链条，转变经济增长方式，走以科技支撑经济社会持续快速健康发展的新路子。

”西南大学是教育部直属“211工程”建设高校，在农业教育和农业科技方面有着突出优势和鲜明特色。

1997年，学校作为重庆市委农工委扶贫集团成员单位，就开始参与石柱县的对口帮扶工作，但这种短期、分散的“输血式”扶贫收效甚微，带动辐射效应不足，持续发展能力不够。

学校认为，学校的发展必须要同重庆的发展、西部的发展、国家的发展结合起来，统筹人才培养、科学研究、社会服务等职能，在引领和服务社会发展中促进自身发展。

学校决定调整原来的科技扶贫思路，经过深入调研，学校决定调动全校科教资源, 长期稳定在一个区域集中转化科研成果，帮助地方脱贫致富，真正实现大学的社会服务职能。

在这样的时代背景下，县校双方都面临着共同的任务，思考着共同的课题。

2003年10月，在重庆市委、市政府的支持下，学校与石柱县开始合作共建“石柱农业科技综合示范基地”。

十年探索立潮头阳光采购谱华章--深圳市龙岗区不断深化改革做大做强政府采购

多年未，深士ＪｌＩ市龙岗区政府：采购中心通过强化监管、规范采购优质陂和扎实开展诚信建设等措施，政府采购事业取得丁前所未有的大发展。
十年探索立潮头阳光采
深圳市龙岗区不断深化改革做大做强政府采购
口岳向东
随着经济建设和各项社会事业的跨越式前进，深圳市龙岗区政府采购事业也取得了前所未有的大发展。在龙岗区委、区政府的关心、重视和各部门、各街道的大力支持、配合下，龙岗区政府采购中心坚持 “ 公开、公平、公正 ”的政府采购原则，在积极为采购单位提供优质高效服务的同时，严格依法依规依程序操作，连年圆满完成了各项政府采购任务，充分发挥了政府采购 “ 源头防腐、节约资金、政策扶持”三大功能作用，为促进龙岗区经济社会发展和廉洁城区建设做出了积极贡献。
考核先进单位” 。
严把
公
斐然
１．机构队伍建设上台阶。２００３年９月，
龙岗区政府采购中心成立之初，仅有２个
内设部门、１０名编制，办公场所面积不足２００平方米。如今，中心内设综合科、采购一科、采购二科、采购三科和监督科五个科室，人员编制３３名，现有工作人员３５人，其中党员１７人；拥有２４００多平方米
２．采购领域不断拓展。随着政府采购制度的不断建立和完善，龙岗区政府采购范围由先前单纯的普通货物及办公用品采购，逐步扩大到覆盖所有货物、服务和工程采购项目，政府采购品目从起步时期的｛
１０多个发展到现在的三大类共３２７个，服

第18讲社会主义建设在探索中曲折发展(练习)(原卷版)_1

第18讲社会主义建设在探索中曲折发展目录模拟.基础演练 (1)重难.创新演练 (4)真题.实战演练 (7)1．【十年探索时期】1956年毛泽东在论述未来国家工业化发展战略时提到：“如果没有足够的粮食和其他生活必需品，首先就不能养活工人，还谈什么发展重工业所以，重工业和轻工业、农业的关系，必须处理好。

”毛泽东这一主张（）A．存在着左倾冒进的倾向B．强调产业平衡发展的必要性C．基于对苏联模式的反思D．要求农业技术进步的紧迫性2．【十年探索时期】1956年，党和国家对国民经济结构作出了一些调整：在城镇，分散了一部分过于集中的小手工业和小商业，个体经济和自由市场也有所恢复和增加；在农村，允许一部分生产资料如鱼塘、菜地、果园、桑园、成片林木等可以暂不入社，归原主经营等。

上述措施（）A．增添了国民经济的活力B．反思了人民公社的弊端C．推动了国民经济的调整D．提高了农民的生活水平3．【工业、农业领域的成就】20世纪六七十年代，党和政府采用大会战模式推进铁路工程，设立以成昆线为中心的西南铁路建设指挥部，组建总数达30余万人的联合筑路大军，组织沿线地方政府开展支援铁路建设工作，成功修建了成昆、襄渝等一批铁路。

这一模式（）A．使得中国基础设施建设走在世界前列B．折射出特定历史环境下国家政策选择C．促使西南地区整体性贫困得到了解决D．得益于社会主义市场经济体制的建立4．【工业、农业领域的成就】1966年2月2日，《上海市第三个五年计划绿化工作规划（草案）》发布，指出：“本市市郊面积大，地处国防前哨，海岸线长，绿化植树要多种快长、高大、荫浓的乔木，尽速把海岛、沿海沿江、山头、公路、部队驻地、工矿企业、农村四旁等地普遍绿化起来。

”据此可知，该规划（）A．体现敢为人先的时代精神B．缓解了中国的外交困局C．重在提升应对风险的能力D．受“左”倾思想的影响5．【教育、卫生、文化领域的成就】如图所示为1956年中国政府发行的系列体育宣传画。

深碳观测计划——对地球内部碳的十年探索

Views&CommentsThe Deep Carbon Observatory:A Ten-Year Quest to Study Carbon inEarthCraig M.Schiffries,Andrea Johnson Mangum,Jennifer L.Mays,Michelle Hoon-Starr,Robert M.Hazen Geophysical Laboratory,Carnegie Institution for Science,Washington,DC20015,USA1.OverviewThe Deep Carbon Observatory(DCO)is a ten-year research pro-gram to investigate the quantities,movements,forms,and origins of carbon in Earth.More than90%of Earth’s carbon may reside in the planet’s deep interior,and DCO’s overarching mission is to understand Earth’s entire carbon cycle—beyond the atmosphere, oceans,and shallow crustal environments,which have drawn most previous research attention—to include the deep carbon cycle[1,2].A decade of focused research has led to major discoveries by DCO scientists on the physical,chemical,and biological roles of carbon in Earth.To pursue its multidisciplinary mission,DCO connects more than1200scientists worldwide,broadly grouping them into four Science Communities:Extreme Physics and Chemistry,Reservoirs and Fluxes,Deep Energy,and Deep Life(Table1).The program also emphasizes four crosscutting activities that bridge community boundaries—namely,data science,instrumentation,ﬁeld studies, and modeling and visualization—and several cross-community groups that provide essential services to the entire DCO commu-nity(Fig.1).In addition to its scientiﬁc advances,DCO has created an endur-ing legacy of interdisciplinary and international community build-ing,successfully establishing a diverse,dynamic,and collaborative community of geologists,physicists,chemists,and biologists in more than50countries.In particular,DCO has focused on cultivat-ing the next generation of deep carbon researchers by supporting early career scientists who will carry on the tradition of explo-ration and discovery for decades to come.The vision,guiding questions,and scientiﬁc goals of DCO were initially framed at an international Deep Carbon Cycle Symposium at the Carnegie Institution for Science in2008.This symposium led to a successful proposal to the Alfred P.Sloan Foundation to estab-lish a decadal research program on deep carbon science from2009 to2019.The Alfred P.Sloan Foundation pledged seed funding of50 million USD over ten years to foster DCO.DCO has leveraged the support from the Alfred P.Sloan Foundation with more than500 million USD in support from other sources,including international organizations,national science agencies,foundations,and the private sector.2.The Extreme Physics and Chemistry CommunityDCO’s Extreme Physics and Chemistry Community is dedicated to improving our understanding of the physical and chemical behavior of carbon at extreme conditions,as found in the deep interiors of Earth and other planets.This Community is making transformational advances in our understanding of carbon in min-erals,magmas and melts,and aqueousﬂuids at extreme condi-tions.DCO scientists have published new results on the properties of carbon-bearing minerals at high pressures and tem-peratures,including the structure,compressibility,and elasticity of carbonate minerals,carbides,carbon dioxide(CO2)ices,and clathrates.One discovery is the formation of phases with sp3 hybridization of carbon to yield tetrahedral coordination of carbon by oxygen at elevated pressure and temperature.Under ambient conditions,CO2is a linear molecule;however,at sufﬁciently high pressure,CO2transforms into a polymerized framework structure in which carbon is tetrahedrally coordinated with four oxygen atoms[3].Dense forms of polymeric CO2are potential reservoirs of carbon in planetary interiors.The stabilization of tetrahedrally coordinated carbon has profound implications if this carbon substi-tutes for tetrahedrally coordinated silicon in silicate minerals.This substitution mechanism has been veriﬁed experimentally[4],and indicates a potential reservoir for carbon in Earth and planetary interiors.DCO scientists have also conducted extensive research on carbonate minerals under extreme conditions.Under ambient conditions,carbon forms trigonal planar structural units in car-bonate minerals.At high pressure,carbonate minerals transform into denser structures in which carbon is tetrahedrally coordi-nated with four oxygen atoms[5–11]—a discovery that has important implications for the stability and properties of carbon-ates in the deep carbon cycle[12,13].Complementary experimen-tal studies of carbon in iron at extreme conditions provide conﬂicting evidence about the elusive role of carbon in Earth’s core[14–16].Magma ocean processes set the initial distribution of carbon and conditions for further development of Earth’s deep carbon cycle[17].Magmas are also the main agent for transporting carbon from Earth’s interior to its surface[18].Conversely,carbon inﬂu-ences deep Earth dynamics by inducing melting and mobilizationof structurally bound mineral water [19].Melting may also have a major impact on the recycling of subducted carbon into the deep mantle.The melting-phase relations of recycled oceanic crust sug-gest that slabs undergo melting and loss of carbonate components in the transition zone,creating a barrier to deep carbon subduction [20].Recent experimental studies indicate that carbonatitic liquids provide a potentially signiﬁcant pathway for carbon recycling at shallow depths beneath arcs [21].DCO is making rapid advances in our understanding of the role of aqueous ﬂuids in the deep carbon cycle.Until recently,thermodynamic models developed to understand water-rock interactions in Earth’s upper and middle crust could not be extended to deeper environments,largely because the dielectric constant of water at extreme conditions was unknown.DCO sci-entists removed this barrier by conducting ﬁrst-principles calcu-lations of the dielectric constant of water under extreme conditions and the transport of carbonates in the deep Earth[22].These calculations were used in combination with experi-mental results [23]to develop the Deep Earth Water (DEW)model [24].Initial results from the DEW model demonstrate that organic carbon plays an important role in subduction zone ﬂuids [25]and that diamonds can form due to pH shifts in deep ﬂuids [26].The role of carbon in setting the pH of subduction zone ﬂuids can now be assessed,with implications for volatile and metal cycles [27].This approach is transforming our view of global geochemical transport [28].3.The Reservoirs and Fluxes CommunityDCO’s Reservoirs and Fluxes Community is dedicated to iden-tifying the principal deep carbon reservoirs,determining the mechanisms and rates by which carbon moves among these reservoirs,and assessing the total carbon budget of Earth.Table 1DCO decadal goals.DCO Science Community Decadal goalsExtreme Physics and ChemistrySeek and identify possible new carbon-bearing materials in Earth and planetary interiorsCharacterize the structural and dynamical properties of materials and identify their reactions and transformations at conditions rele-vant to Earth and planetary interiorsDevelop,extend,combine,and exploit experimental tools to investigate carbon-bearing samples in new regimes of pressure,temper-ature,and bulk compositionDevelop,extend,and improve databases and simulations of deep carbon material properties,reactions,and transport for integration with quantitative models of global carbon cyclingReservoirs and FluxesEstablish open access,continuous information streams on volcanic gas emission and related activity Determine the chemical forms and distribution of carbon in Earth’s deepest interiorDetermine the seaﬂoor carbon budget and global rates of carbon input into subduction zonesEstimate the net direction and magnitude of tectonic carbon ﬂuxes from the mantle and crust to the atmosphereDevelop a robust overarching global carbon cycle model through deep time,including the earliest Earth and coevolution of the geo-sphere and biosphereProduce quantitative models of global carbon cycling at various scales,including the planetary scale (mantle convection),tectonic scale (subduction zone,orogeny,rift,volcano),and reservoir scale (core,mantle,crust,hydrosphere)Deep EnergyUtilize ﬁeld-based investigations of approximately 25globally representative terrestrial and marine environments to determine pro-cesses controlling the origin,form,quantities,and movements of abiotic gases and organic species in Earth’s crust and uppermost mantleImplement the use of DCO-sponsored instrumentation,especially revolutionary isotopologue measurements,to discriminate the abiotic versus biotic origin of methane gas and organic species sampled from global terrestrial and marine ﬁeld sitesQuantify as a function of temperature,pressure,ﬂuid and solid compositions,and redox state the mechanisms and rates of ﬂuid-rock interactions that produce hydrogen (H 2),abiotic forms of hydrocarbon gases,and more complex organic compoundsIntegrate our quantitative understanding of the processes that control the origins,forms,quantities,and movements of abiotic vs.biotic carbon compounds with quantitative models of global carbon cyclingDeep LifeDetermine the processes that deﬁne the diversity and distribution of deep life as it relates to the carbon cycle Determine the environmental limits of deep lifeDetermine the interactions between deep life and carbon cycling onEarthFig.1.DCO organizational structure.C.M.Schiffries et al./Engineering 5(2019)372–378373Its Diamonds and Mantle Geodynamics of Carbon(DMGC)group has created an international infrastructure to study Earth’s deep interior through the unique record preserved in diamonds.DMGC aims to advance deep Earth exploration by studying natural diamonds and diamond-formingﬂuids and melts in order to elucidate carbon mobility in Earth through geologic time[29]. Because this effort hinges,in part,on sample availability and a coordinated effort toward sample research,DMGC is developing registered sample collections and a geochemical database of diamonds and diamond inclusions.The discovery of native metals,metal carbides,and reduced volatiles in large gem-quality diamonds indicates that these dia-monds formed from metallic liquid in Earth’s deep mantle,and provides broad implications for Earth’s evolution[30].In contrast, highly salineﬂuids from a subducting slab are the source for cer-tainﬂuid-richﬁbrous diamonds;the data imply a strong associa-tion between subduction,mantle metasomatism,andﬂuid-rich diamond formation,as well as pointing to the important effect of subduction-derivedﬂuids on the composition of the deep litho-spheric mantle[31].The discovery of hydrous ringwoodite included within an ultradeep diamond provides direct evidence of a hydrous mantle transition zone,which may have a key role in terrestrial magmatism and plate tectonics[32].The discovery of calcium silicate perovskite in a diamond that formed780km below Earth’s surface provides theﬁrst direct observation of Earth’s fourth most abundant mineral;the isotopic composition of carbon in the surrounding diamond,together with the pristine high-pressure CaSiO3structure,indicate the recycling of oceanic crust into the lower mantle[33].Blue boron-bearing diamonds contain mineral inclusions indicating that these diamonds formed in oceanic lithosphere that was subducted into Earth’s lower man-tle.Blue diamonds indicate a pathway for the ultradeep recycling of carbon,water,and other materials from the crust to the lower mantle and back to the surface[34].The Reservoirs and Fluxes Community’s Deep Earth Carbon Degassing(DECADE)initiative aims to determine accurate global ﬂuxes of volcanic CO2to the atmosphere.To achieve this goal, DECADE has launched an intensiveﬁeld-based effort to install CO2-monitoring networks on20of the world’s150most actively degassing volcanoes.DECADE also conducts laboratory-based studies,which focus on using gas samples and melt inclusions to provide empirical constraints on carbon degassing to the atmosphere.High-frequency gas monitoring at Turrialba Volcano in Costa Rica revealed CO2precursors to eruptions,which lays the foun-dation for improved volcanic eruption forecasts[35].An interna-tional team led by DECADE members demonstrated that the Ambrym basaltic volcano in the Vanuatu Arc in the southwest Paciﬁc Ocean ranks among the top-three known persistent emit-ters of volcanic gas at the global scale[36].There is growing evi-dence that continental rifts represent a major source of deep carbon released to Earth’s surface from both volcanoes and fault zones[37–40].New measurements of olivine-hosted melt inclu-sions from the Mid-Atlantic Ridge indicate that upper mantle carbon content varies by almost two orders of magnitude glob-ally,which can affect the dynamics of melting,the style of vol-canism,and the evolution of Earth’s atmosphere via planetary outgassing[41].For theﬁrst time in a global study,DCO scien-tists found evidence for higher carbon output(m(CO2)/m(S total), where m(CO2)and m(S total)are the amounts of CO2and total sul-fur,respectively)in volcanic arcs where carbonate sediment sub-ducts on the seaﬂoor[42].A synthesis of global carbon and helium isotopic data from arc volcanoes concludes that the car-bon isotope composition of mean global volcanic gas is consider-ably heavier than the canonical mid-ocean ridge basalt value;this result indicates that reworking of crustal limestone is an important source of volcanic carbon,which has implications regarding the return of carbon to the deep mantle and for Earth’s past climate[43].Modeling and visualization of Earth’s deep carbon cycle through deep time contributes signiﬁcantly to DCO’s overall goals.A reeval-uation of carbonﬂuxes in subduction zones indicates that almost all of the carbon in subducting sediments and oceanic plates may be extracted inﬂuids and melts,with relatively little carbon being returned to the convecting mantle[44].Plate tectonic reconstruc-tions establish connections between the deep carbon cycle and the concentration of CO2in the atmosphere over geologic time scales[45–47].Numerical models of the role of volatiles in reactive melt transport in the asthenosphere indicate that CO2and water, despite their low concentration,have an important control on the extent and style of magma genesis,as well as on the dynamics of melt transport and the stranding of carbon at the lithosphere–asthenosphere boundary;theseﬁndings have signiﬁcant implica-tions for deep Earth degassing[48,49].4.The Deep Energy CommunityDCO’s Deep Energy Community is dedicated to developing a fundamental understanding of environments and processes that regulate the volume and rates of the production of abiogenic hydrocarbons and other organic species in the crust and mantle through geological time.This research is transforming our under-standing of methane(CH4)and includes novel information about its origin,provenance,and formation temperature.Revolutionary advances in instrumentation make it possible to discriminate between methane produced by abiotic synthesis and that produced by biological processes.The Panorama mass spectrometer is theﬁrst instrument capable of resolving the two doubly substituted mass-18 isotopologues of methane(‘‘clumped isotopes”)—13CH3D and 12CD2H2—at natural abundances[50].A paper by Edward Young and23co-authors from14institutions in eight countries[51] reports theﬁrst resolved measurements of two doubly substituted isotopologues of methane in gases collected from diverse geologic settings around the globe,including major natural gasﬁelds,ultra-maﬁc complexes,and ancient waters from deep underground mines in Precambrian Cratons.If thermodynamic equilibrium is achieved,then D13CH3D and D12CD2H2serve as two independent, intramolecular thermometers.If thermodynamic equilibrium is not achieved,then temperature cannot be determined by this method;however,the data may provide the means for distinguish-ing between abiotic and biotic origins of methane.Disequilibrium isotopologue ratios can provide information about methane forma-tion mechanisms and serve as tracers that provide insights into mixing,diffusion,kinetics,and other processes[51].Ubiquitous dissolved methane in hot-springﬂuids emanating from submarine hydrothermal vents is a potential carbon source for microbial communities living at and below the seaﬂoor and in the water column.Methane clumped isotope analyses indicate a hot(270–360°C),deep,and abiotic origin for methane at seaﬂoor hot springs in unsedimented oceanic crust[52].This important ﬁnding was made possible by a novel tunable infrared laser direct absorption spectroscopy instrument[53],which was developed with DCO ing the same instrument,microbial methane from a broad range of natural and cultured samples produced non-equilibrium clumped isotope signals[54].The clumped isotope anomalies place new constraints on biogeochemical sources,sinks, and budgets of methane.374 C.M.Schiffries et al./Engineering5(2019)372–378Computational studies have identiﬁed a novel mechanism for abiotic methane formation:The effects of conﬁnement on carbon dioxide methanation in nanopore-controlled chemical reactions can shift thermodynamic equilibrium toward methane production [55].This mechanism for producing abiotic methane may be appli-cable to interactions between seawater and oceanic crust,and could explain the origin of methane observed in some submarine hydrothermal vent systems.Experimental studies have been conducted on abiotic methane formation under a wide range of conditions,including reducing environments that develop during serpentinization of ultramaﬁc ing isotopically labeled CO2,some experiments have shown that earlier claims of CH4production by serpentinization at low temperatures were incorrect[56].However,other experi-ments have shown that CO2reduction in the presence of extant hydrogen(H2)vapor leads to signiﬁcant methane production at low temperatures[56].Similarly,the production of methane in ser-pentinized ultramaﬁc rocks can be catalyzed at low temperatures by ruthenium(Ru)-bearing chromite minerals[51,57].DCO researchers have studied the production of H2and CH4dur-ing serpentinization atﬁeld sites around the world.For example, International Ocean Discovery Program(IODP)Expedition357: Atlantis Massif Serpentinization and Life successfully cored a transect across the Atlantis Massif on theﬂank of the Mid-Atlantic Ridge.This expedition examined the role of serpentinization in driving seaﬂoor hydrothermal systems,sustaining microbial communities,and sequestering carbon[58].In a remarkable paper,DCO scientists documented abiotic syn-thesis of amino acids in the oceanic lithosphere[59].Amino acids formed abiotically during a late alteration stage of massif serpen-tinites beneath the Atlantis Massif.This discovery has signiﬁcant implications for the origins of life,ancient metabolisms,and the functioning of the present-day deep biosphere.Ancient groundwaters in Precambrian Cratons are now recog-nized as important sources of H2,which is available to support the subsurface biosphere to depths of several kilometers[60]. The contribution of Precambrian continental crust to global H2pro-duction had been greatly underestimated.If H2production via both radiolysis and hydration reactions is taken into account,H2pro-duction rates from the Precambrian continental lithosphere are comparable to estimates from marine systems[61].Incorporating H2production from the Precambrian continental lithosphere could double existing estimates of global H2,increasing the habitable volume of Earth’s crust.Research on molecular hydrogen is not limited to Earth.DCO scientists are members of the teams that discovered molecular hydrogen and higher hydrocarbons escaping from Saturn’s moon Enceladus,which has a layer of ice covering a subsurface ocean [62,63].The discovery of molecular hydrogen indicates that water is reacting with rocks on theﬂoor of the alien ocean[62].The pro-cess responsible for producing molecular hydrogen on Enceladus might resemble hydrothermal vents on Earth’s seaﬂoor.The dis-covery of complex carbon compounds emanating from Enceladus [63]suggests that the moon’s ocean may contain the raw ingredi-ents necessary for life.5.The Deep Life CommunityDCO’s Deep Life Community is dedicated to assessing the nature and extent of the deep microbial and viral biosphere.This Commu-nity has expanded the known boundaries of Earth’s microbial and viral biosphere,and investigated the interactions and processes that govern how ecosystems survive and evolve.DCO has united researchers approaching overarching deep life questions from varying perspectives by:①studying the subsurface biosphere in the sediments and rocks of both the continents and the seaﬂoor;②exploring what genomes can reveal about the limits and possi-ble origins of life;and③investigating the response of deep life to a range of physical and chemical extremes.The lower boundary of the deep sedimentary biosphere was explored by DCO researchers participating in IODP Expedition 337:Deep Coalbed Biosphere off Shimokita.They discovered a microbial ecosystem producing methane from Miocene coalbeds nearly2.5km below the seaﬂoor[64].The assemblages appear to be the descendants of microbes buried in terrigenous sediments up to20million years ago.Despite low cell numbers,these microbes are actively growing at rates that range from months to over100years—some of the slowest microbial biosynthesis rates ever directly measured by incubation[65].Other DCO researchers found microbial communities exhibiting aerobic respiration in sediments75m below the seaﬂoor in the South Paciﬁc Gyre,a ﬁnding that suggests that oxygen and aerobic communities may occur in sediments over15%–44%of the Paciﬁc and perhaps 9%–37%of the global seaﬂoor[66].The select survival of taxa capable of coping with the severe energy stresses characteristic of subsurface environments may cause these taxa to become the founders of more common commu-nities such as Bathyarchaeota,which may play an important role in carbon cycling[67].Therefore,microbial communities existing at extremes,such as the elevated temperatures in hydrogen-rich hydrothermal vent systems on the Mid-Cayman Rise,are critical to understanding the limits of deep life[68].For example,mem-bers of the Bathyarchaeota are among the most abundant,diverse, and widely distributed Archaea in marine subsurface habitats glob-ally.A metagenomic study has shown that Bathyarchaeotal sub-groups employ versatile metabolisms,which in turn supply substrates for heterotrophic and methanogenic community mem-bers[69].Another metagenomic study indicates that distinct evo-lutionary pressures correlate with genes related to nutrient uptake, bioﬁlm formation,or viral invasion,aﬁnding that is consistent with distinct evolutionary histories between geochemically differ-ent hydrothermal ventﬁelds[70].Based on observations of Archaea and bacteria at77worldwide locations with different marine ecosystems,DCO researchers determined that methane seep communities exhibit lower diver-sity than communities in other ecosystems.The surviving assem-blages reﬂect the most favorable microbial metabolisms at methane seeps and distinguish the seep microbiome from other seaﬂoor microbiomes[71].Although only a few species of methan-otrophs occur at all seeps worldwide,these microorganisms seem to greatly inﬂuence the methane budget of the ocean.DCO also investigates the deep terrestrial continental bio-sphere.Based on a compilation of cell concentration and microbial diversity data from continental subsurface localities around the globe,DCO researchers estimated that the continental subsurface hosts(2–6)Â1029cells,and found that bacteria are more abun-dant than Archaea and that their community composition is corre-lated to sample lithology[72].Researchers investigating a subsurface lithoautotrophic micro-bial ecosystem(SLiME)in the ancient Witwatersrand Basin found, to their surprise,that sulfur-driven autotrophic denitriﬁers were the dominant microbial group.Further analysis revealed that metabolic community cooperation enabled less typical metabolic reactions to prevail and stabilize the ecosystem[73].Modeling also suggests that food—not dissolved oxygen—limits eukaryotic popu-lation growth at1.4km depths in12300-year-old palaeometeoric ﬁssure water in South African mines[74,75].Microbial communities occurring in connection with hydraulic fracturing during hydrocarbon resource development in the deep subsurface also provide clues to the deep terrestrial biosphere[76].Microbes exist as deep as2500m below land surface and exhibit saltC.M.Schiffries et al./Engineering5(2019)372–378375tolerance,metabolic capacity without electron acceptors,and evi-dence of active viral infection.Through the DCO Census of Deep Life(CoDL),DNA sequencing has provided new and value-added information about carbon cycling,deep biosphere evolution,and the connection between ecosystems and environments both continental and marine.For example,CoDL researchers used16S DNA sequencing to identify bacterial and archaeal taxa associated with eight minerals from a sub-seaﬂoor microbial observatory on the Juan de Fuca Ridge, 280m below the seaﬂoor.They conﬁrmed that distinct communi-ties colonize different minerals,and that these communities group by mineral chemistry[77].DCO’s Extreme Biophysics group has approached the challenges of life existing in these extreme environments from a completely different angle.By focusing on molecular-level adaptation to life under extreme conditions,these researchers are advancing our knowledge of the basic chemistry and physics of the component biological structures and systems that deﬁne the limits of life [78,79].6.Synthesis and future opportunitiesDCO is synthesizing and integrating research across its four Science Communities to realize a new understanding of deep car-bon science and fully capture DCO’s achievements.This synthesis process aims to elevate the collaborative efforts of the global research initiative.Synthesis products and activities include cross-community research projects,such as Biology Meets Subduc-tion and Carbon Mineral Evolution,as well as workshops,meet-ings,visualizations,special issues of journals,and books.The culmination of these activities will occur at an international con-ference,Deep Carbon2019:Launching the Next Decade of Deep Carbon Science.To help launch the next decade of deep carbon science,DCO sci-entists are developing a broad portfolio of activities that will extend beyond the culmination of the initial decadal program in 2019.A biennial Gordon Research Conference on Deep Carbon Science is planned as a sustainable successor to DCO international science meetings.A biennial Gordon Research Seminar on Deep Carbon Science for early career scientists could become a successor to DCO Summer Schools and DCO Early Career Scientist Work-shops.Carbonates at High Pressures and Temperatures(CarboPaT), a research consortium supported by the German Research Founda-tion to study carbonates at extreme conditions,will continue to provide a platform for deep carbon science in Germany.In the United Kingdom,the Natural Environment Research Council has established a research program on Volatiles,Geodynamics,and Solid Earth Controls on the Habitable Planet.Science for Clean Energy is a European consortium led by DCO researchers with sup-port from the European Union’s Horizon2020program.The next decade of deep life research will be facilitated by a new Interna-tional Center for Deep Life Investigation at Shanghai Jiao Tong University in China as well as a cluster of excellence titled The Ocean Floor—Earth’s Uncharted Interface in Germany.These and other initiatives will help propel the next decade of deep carbon science.7.ConclusionIn2009,DCO was an ambitious experiment in scientiﬁc pro-grams with no guarantee of success.Since then,DCO has evolved into a network of more than1200scientists that spans the globe and transcends traditional scientiﬁc disciplines.DCO is a science incubator that has launched new research groups,science commu-nities,international scientiﬁc collaboration and partnerships,major research projects,ﬁeld expeditions,scientiﬁc instruments, and companies.Perhaps most importantly,DCO has built an enduring legacy in its diverse,dynamic,and collaborative com-munity of interdisciplinary scientists.DCO’s management and community-building innovations are keys to the program’s scien-tiﬁc success.Based on its success in achieving fundamental advances in deep carbon science,DCO may serve as an effective model for tackling large-scale,interdisciplinary,and international science questions.AcknowledgementsThe Deep Carbon Observatory would not have been possible without generous,long-term support from the Alfred P.Sloan Foundation.Deep carbon science has advanced through the collective efforts of many other organizations,including:the Canadian Space Agency;Canada Research Chairs Program; Carnegie Institution for Science;Chinese Academy of Sciences; Conseil Régional d’Ile de France;Deutsche Forschungsgemein-schaft;European Research Council;European Commission;Inter-national Continental Scientiﬁc Drilling Program;International Ocean Discovery Program;Japan Agency for Marine-Earth Science and Technology;Japan Society for the Promotion of Science; Ministry of Education,Culture,Sports,Science,and Technology of Japan;Natural Sciences and Engineering Research Council of Canada;Russian Ministry of Science and Education;Swiss National Science Foundation;UK Natural Environment Research Council;US National Science Foundation;US Department of Energy;and US National Aeronautics and Space Administration. We have beneﬁted enormously from the members of the DCO Executive Committee,Scientiﬁc Steering Committees,and other leadership groups,especially the chairs and co-chairs of the Scientiﬁc Steering Committees:Isabelle Daniel,Marie Edmonds, Erik Hauri,Kai-Uwe Hinrichs,Craig Manning,Wendy Mao, Bernard Marty,Mitch Sogin,and Edward Young.References[1]Hazen RM,Schiffries C.Why deep carbon?Rev Mineral Geochem2013;75:1–6.[2]Hazen RM,Jones AP,Baross JA,editors.Carbon in Earth,reviews in mineralogyand geochemisty.Chantilly:Mineralogical Society of America and Geochemical Society;2013.[3]Santoro M,Gorelli FA,Bini R,Haines J,Cambon O,Levelut C,et al.Partiallycollapsed cristobalite structure in the non molecular phase V in CO2.Proc Natl Acad Sci USA2012;109(14):5176–9.[4]Santoro M,Gorelli FA,Bini R,Salamat A,Garbarino G,Levelut C,et al.Carbonenters silica forming a cristobalite-type CO2-SiO2solid solution.Nat Commun 2014;5(3761):3761.[5]Boulard E,Gloter A,Corgne A,Antonangeli D,Auzende AL,Perrillat JP,et al.New host for carbon in the deep Earth.Proc Natl Acad Sci USA2011;108(13):5184–7.[6]Boulard E,Pan D,Galli G,Liu Z,Mao WL.Tetrahedrally coordinated carbonatesin Earth’s lower mantle.Nat Commun2015;6(6311):6311.[7]Cerantola V,Bykova E,Kupenko I,Merlini M,Ismailova L,McCammon C,et al.Stability of iron-bearing carbonates in the deep Earth’s interior.Nat Commun 2017;8(15960):15960.[8]Liu J,Lin JF,Prakapenka VB.High-pressure orthorhombic ferromagnesite as apotential deep-mantle carbon carrier.Sci Rep2015;5(7640):7640.[9]Lobanov SS,Dong X,Martirosyan NS,Samtsevich AI,Stevanovic V,GavryushkinPN,et al.Raman spectroscopy and X-ray diffraction of sp3CaCO3at lower mantle pressures.Phys Rev B2017;96(10):104101.[10]Merlini M,Cerantola V,Gatta GD,Gemmi M,Hanﬂand M,Kupenko I,et al.Dolomite-IV:candidate structure for a carbonate in the Earth’s lower mantle.Am Mineral2017;102(8):1763–6.[11]Merlini M,Crichton WA,Hanﬂand M,Gemmi M,Müller H,Kupenko I,et al.Structures of dolomite at ultrahigh pressure and their inﬂuence on the deep carbon cycle.Proc Natl Acad Sci USA2012;109(34):13509–14.[12]Dorfman S,Badro J,Nabiei F,Prakapenka VB,Cantoni M,Gillet P.Carbonatestability in the reduced lower mantle.Earth Planet Sci Lett2018;489:84–91.[13]Fu S,Yang J,Lin JF.Abnormal elasticity of single-crystal magnesiosideriteacross the spin transition in Earth’s lower mantle.Phys Rev Lett2017;118(3):036402.[14]Wood B,Li J,Shahar A.Carbon in the core:its inﬂuence on the properties ofcore and mantle.Rev Mineral Geochem2013;75:231–50.376 C.M.Schiffries et al./Engineering5(2019)372–378。

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