山西省大同市新荣区石墨矿岩石矿物地球化学特征与成因
合集下载
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
2020 年 11 月 第 41 卷 第 6 期: 827-834
地球学报
Acta Geoscientica Sinica
Nov. 2020 Vol.41 No.6: 827-834
山西省大同市新荣区石墨矿岩石矿物 地球化学特征与成因
梁钰琦 1, 2), 赵 永 1), 吴光存 1), 张 越 1), 夏庆霖 2)
1) No. 217 Geological Party, Shanxi Provincial Geological Prospecting Bureau, Datong, Shanxi 037008; 2) China University of Geosciences (Wuhan), Wuhan, Hubei 430074
1)山西省地质勘查局二一七地质队, 山西大同 037008; 2)中国地质大学(武汉), 湖北武汉 430074
摘 要: 山西省大同市新荣区石墨矿带总体呈北东—南西向展布, 长约 22 km, 赋矿层位为中下太古界右
所堡组, 岩性为含石墨黑云斜长片麻岩。目前该矿带上已有 7 个勘查区, 累计查明晶质石墨矿物资源量约
合副变质岩特征; 稀土元素配分曲线及其研究表明矿体及围岩具有沉积岩变质特征; 以 TiO2-F 图解、 [(al+fm)–(c+alk)]/Si 图解以及(al–alk):c 图解展示的岩石化学特征半定量地确认新荣区石墨矿带矿床为以黏
土岩为主的区域变质成矿。新荣区石墨矿带成因类型的确定填补了该区域矿床成因类型研究的空白, 为下
Research on Geochemistry Characteristics and Genesis of the Graphite Deposit in Xinrong District of Datong City, Shanxi Province
LIANG Yu-qi1, 2), ZHAO Yong1), WU Guang-cun1), ZHANG Yue1), XIA Qing-lin2)
Abstract: The NE–SW trending graphite belt (graphite-bearing oblique gneiss) extends for more than 22 km in Xinrong District of Datong City. Although 50 million tons of scaly graphite mineral resources were prospected along the ore belt, the study of the genetic type of the deposit in this area is relatively insufficient. Based on local geological information and analytical results, the authors determined the genesis of the deposit by restoring the original of metamorphic rock in this paper. The belt was deeply metamorphosed from sedimentary rock as shown by qualitative judgment from the geological attitudes and combination, petrographic signs, and secondary mineral characteristics. The element ratio (Sr:Ba, etc.) and rare-earth element curves show that the ore and its surrounding rocks experienced metamorphism from sedimentary rock. Combined with TiO2-F diagram, [(al+fm)–(c+alk)]/Si diagram and (al–alk):c in the petrochemical characteristics, the authors gradually determined the range of the original rock, and finally detected that the clay rocks were dominantly the original rocks in Xinrong District. It is concluded that the genetic type of the graphite ore belt in Xinrong District is a region of deep metamorphism of clay rocks, and this finding fills the gap of the study of the genesis type of the deposit in this region and provides the basis for further prospecting and geological modeling. Key words: Xinrong District of Datong City; scaly graphite; protolith recovery; rare-earth element; element ratio; Negri value; genetic type
一步地质找矿及建模提供了重要依据; 三种图解相结合提供了新的思路和判别方法。
关键词: 大同市新荣区; 晶质石墨; 原岩恢复; 稀土元素; 元素比值; 尼格里值; 成因类型
中图分类号: P571; P595
文献标志码: A doi: 10.3975/cagsb.2020.071903
5000 万吨, 但对其矿床成因类型研究相对较少。本文收集整理和分析总结了区域内地质资料及化验分析结
果, 采用变质岩原岩恢复的四种方法确定该矿带的成因: 从石墨矿带的矿体产状和岩石组合、岩相学和矿
物学特征定性判断该矿带矿床为沉积岩区域深变质成矿类型; 矿体样品地球化学微量元素比值(Sr:Ba 等)符
地球学报
Acta Geoscientica Sinica
Nov. 2020 Vol.41 No.6: 827-834
山西省大同市新荣区石墨矿岩石矿物 地球化学特征与成因
梁钰琦 1, 2), 赵 永 1), 吴光存 1), 张 越 1), 夏庆霖 2)
1) No. 217 Geological Party, Shanxi Provincial Geological Prospecting Bureau, Datong, Shanxi 037008; 2) China University of Geosciences (Wuhan), Wuhan, Hubei 430074
1)山西省地质勘查局二一七地质队, 山西大同 037008; 2)中国地质大学(武汉), 湖北武汉 430074
摘 要: 山西省大同市新荣区石墨矿带总体呈北东—南西向展布, 长约 22 km, 赋矿层位为中下太古界右
所堡组, 岩性为含石墨黑云斜长片麻岩。目前该矿带上已有 7 个勘查区, 累计查明晶质石墨矿物资源量约
合副变质岩特征; 稀土元素配分曲线及其研究表明矿体及围岩具有沉积岩变质特征; 以 TiO2-F 图解、 [(al+fm)–(c+alk)]/Si 图解以及(al–alk):c 图解展示的岩石化学特征半定量地确认新荣区石墨矿带矿床为以黏
土岩为主的区域变质成矿。新荣区石墨矿带成因类型的确定填补了该区域矿床成因类型研究的空白, 为下
Research on Geochemistry Characteristics and Genesis of the Graphite Deposit in Xinrong District of Datong City, Shanxi Province
LIANG Yu-qi1, 2), ZHAO Yong1), WU Guang-cun1), ZHANG Yue1), XIA Qing-lin2)
Abstract: The NE–SW trending graphite belt (graphite-bearing oblique gneiss) extends for more than 22 km in Xinrong District of Datong City. Although 50 million tons of scaly graphite mineral resources were prospected along the ore belt, the study of the genetic type of the deposit in this area is relatively insufficient. Based on local geological information and analytical results, the authors determined the genesis of the deposit by restoring the original of metamorphic rock in this paper. The belt was deeply metamorphosed from sedimentary rock as shown by qualitative judgment from the geological attitudes and combination, petrographic signs, and secondary mineral characteristics. The element ratio (Sr:Ba, etc.) and rare-earth element curves show that the ore and its surrounding rocks experienced metamorphism from sedimentary rock. Combined with TiO2-F diagram, [(al+fm)–(c+alk)]/Si diagram and (al–alk):c in the petrochemical characteristics, the authors gradually determined the range of the original rock, and finally detected that the clay rocks were dominantly the original rocks in Xinrong District. It is concluded that the genetic type of the graphite ore belt in Xinrong District is a region of deep metamorphism of clay rocks, and this finding fills the gap of the study of the genesis type of the deposit in this region and provides the basis for further prospecting and geological modeling. Key words: Xinrong District of Datong City; scaly graphite; protolith recovery; rare-earth element; element ratio; Negri value; genetic type
一步地质找矿及建模提供了重要依据; 三种图解相结合提供了新的思路和判别方法。
关键词: 大同市新荣区; 晶质石墨; 原岩恢复; 稀土元素; 元素比值; 尼格里值; 成因类型
中图分类号: P571; P595
文献标志码: A doi: 10.3975/cagsb.2020.071903
5000 万吨, 但对其矿床成因类型研究相对较少。本文收集整理和分析总结了区域内地质资料及化验分析结
果, 采用变质岩原岩恢复的四种方法确定该矿带的成因: 从石墨矿带的矿体产状和岩石组合、岩相学和矿
物学特征定性判断该矿带矿床为沉积岩区域深变质成矿类型; 矿体样品地球化学微量元素比值(Sr:Ba 等)符