华北克拉通北缘张家口-宣化地区古生代-中生代岩浆构造活动与成矿作用

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1中国地质调查局发展研究中心,北京 100037 2自然资源部矿产勘查技术指导中心,北京 100083 3东华理工大学核资源与环境国家重点实验室,南昌 330013 4河北省地矿局第三地质大队,张家口 075000 5中国地质大学(北京),北京 100083 6安徽省地质测绘技术院,合肥 230022 1CenterofDevelopmentandResearch,ChinaGeologicalSurvey,Beijing100037,China 2TechnicalGuidanceCenterforMineralResourcesExploration,MinistryofNaturalResources,Beijing100083,China 3StateKeyLaboratoryofNuclearResourceandEnvironment,EastChinaUniversityofTechnology,Nanchang,330013,China 4TheThirdGeologicalBrigadeofHebeiBureauofGeologyandMineralResources,Zhangjiakou075000,China 5SchoolofEarthScienceandResources,ChinaUniversityofGeosciences(Beijing),Beijing100083,China 6InstituteofGeologicalSurveyingandMappingTechnologyofAnhuiProvince,Hefei230022,China 20210101收稿,20210414改回
通讯作者:王大钊,男,1991年生,讲师,主要从事矿床学研究,Email:wangdazhao@ecut.edu.cn
1620
ActaPetrologicaSinica 岩石学报 2021,37(6)
magmas,generatingthecoexistenceofmaficandfelsicigneousrocksDuringtheJurassictoCretaceous,thinningoftheNCCresulted inthewidelydistributedintrusiveandvolcanicrocksLargeamountsofAu,PbZn,AgdepositsandseveralCuandModeposits developedin theZhangjiakouXuanhuaarea Gold depositsmostlylocated in thejunction areaofXuanhua, Chongli, Chicheng counties,whilePbZnAgdepositsdistributedaroundthegoldmineralizationareaMineralizationagesofdepositswereconcentratedin theHercynianandYanshanian,anditisunclearwhethermineralizationoccurredintheIndosinian,butexistinggreatmetallogenic potentialGolddepositsintheZhangjiakouXuanhuaareacouldbedividedintothe“Dongpingtype”,the“Xiaoyingpantype”andthe “Zhangquanzhuangtype”accordingtotheirgeologicalandisotopecharacteristicsThePaleozoicMesozoicmagmaticactivitieswere contributedtogoldmineralization,andmostgolddepositshadgeneticrelationshipswiththeHercynianandYanshanianmagmatic activitiesMultistageandsuperimposedmineralizationaretheessentialfactorstogeneratethelargeamountsofgolddepositsinthe ZhangjiakouXuanhuaarea Keywords ZhangjiakouXuanhuaarea; PaleozoicMesozoic; Magmatictectonicactivities; Magmatictectonicmetallogenical system;Golddeposits
10000569/2021/037(06)161952 ActaPetrologicaSinica 岩石学报
doi:1018654/10000569/20210601
华北克拉通北缘张家口宣化地区古生代中生代岩浆 构造活动与成矿作用
甄世民1,2 王大钊3 白海军4 贾儒雅1,2 王江5 查钟健6 李阳5 缪建普4 ZHENShiMin1,2,WANGDaZhao3 ,BAIHaiJun4,JIARuYa1,2,WANGJiang5,ZHAZhongJian6,LIYang5andMIAOJianPu4
摘 要 河北省张家口宣化地区(张宣地区)位于华北克拉通北缘中段,区内自显生宙以来构造活动频繁,并产出大量岩 浆岩和金矿床,是研究华北克拉通北缘岩浆构造成矿演化体系的重要对象。本文通过对张宣地区的水泉沟正长岩、响水沟 似斑状花岗岩、井儿洼粗安岩英安岩、象山花岗闪长岩、青羊沟黑云母二长花岗岩和张家口组流纹岩的锆石年龄、LuHf同位 素和地球化学组成进行研究,结合前人研究成果,获得区内古生代中生代岩浆岩的侵位时期主要为海西期(峰值 398Ma和 373Ma)、印支期(峰值 234Ma)和燕山期(峰值 143Ma和 130Ma)。张宣地区在古生代中生代经历了古亚洲洋俯冲、华北克拉 通破坏及古太平洋俯冲过程。早古生代时期,古亚洲洋向华北克拉通俯冲;到泥盆纪,白乃庙岛弧带和华北克拉通北缘发生 弧陆碰撞,张宣地区处于弧陆碰撞后的伸展环境,富集地幔岩浆上涌并经历了地壳的同化混染和分离结晶的共同作用,形成 大量碱性岩;二叠纪末期三叠纪,各微陆块相互碰撞,张宣地区处于碰撞后伸展阶段,地幔岩浆引起加厚下地壳的部分熔融, 基性、酸性岩浆混合,导致区内的基性岩与酸性岩共存;侏罗纪白垩纪时期,华北克拉通发生减薄,形成区内大范围的侵入岩 和火山岩。张宣地区产有大量金矿、铅锌矿、银矿及少量铜矿和钼矿,金矿集中产于宣化崇礼赤城交界处,而银铅锌多金属 矿则成群成带环绕金矿化集中区分布。成矿时间主要为海西期和燕山期,印支期成矿尚未明确,但成矿潜力巨大。根据地质 特征和同位素组成,可将张宣地区的金矿床划分为“东坪式”、“小营盘式”和“张全庄式”三类。古生代中生代各时期岩浆活 动对金成矿均有贡献,大部分金矿床与海西期和燕山期岩浆活动联系密切,多期次成矿及成矿叠加是形成张宣地区大量金矿 床的重要因素。 关键词 张家口宣化地区;古生代中生代;岩浆构造活动;岩浆构造成矿系统;金矿 中图法分类号 P5881;P5973;P61851
本文受中国地质调查局地质矿产调查专项 (DD20国家自然科学基金 项 目 (9260019、42003032、 41573036)联合资助. 第一作者简介:甄世民,男,1984年生,博士,高级工程师,主要从事矿床学研究,Email:zhenshimin0001@163.com
ZhenSM,WangDZ,BaiHJ,JiaRY,WangJ,ZhaZJ,LiY andMiaoJP2021ThePaleozoicMesozoicmagmatic tectonicactivitiesandtheirgeologicalimplicationsintheZhangjiakouXuanhuadistrict,northernmarginoftheNorthChina CratonActaPetrologicaSinica,37(6):1619-1652,doi:1018654/10000569/20210601
Abstract TheZhangjiakouXuanhuaareaislocatedinthecentralpartofthenorthernmarginoftheNorthChinaCraton(NCC). TherearemanytectonicactivitiesduringPhanerozoic,andlotsofmagmaticrocksandgolddepositsweredevelopedinthisarea,which isanimportantcasetostudymagmatictectonicmetallogenicevolutionsystemsofthenorthernmarginoftheNCCInthisstudy,we presentzirconUPbages,LuHfisotopeandgeochemicalcompositionsoftheShuiquangousyenite,theXiangshuigouporphyritic granite,theJingerwagranite,theXiangshangranodiorite,theQingyanggoubiotitemonzograniteandtheZhangjiakouFormation rhyoliteCombineingwithpreviouslypublishedresultsintheZhangjiakouXuanhuaarea,threeperiodsofmagmaticactivityhavebeen recognizedduringthePaleozoictoMesozoicTheyaretheHercynianmagmaticactivitywithpeakagesof398Maand373Ma,the Indosinianmagmaticactivitywithpeakageof234MaandtheYanshanianmagmaticactivitywithpeakagesof143Maand130MaThe ZhangjiakouXuanhuaareahadsufferedsubductionofthePaleoAsianOcean(PAO),destructionoftheNCCandsubductionofthe PaleoPacificOcean(PPO).DuringtheEarlyPaleozoic,thePAOsubductedundertheNCCAtDevonian,arccontinentalcollision occurredbetweentheBainaimiaoarcandthenorthernmarginoftheNCC,andtheZhangjiakouXuanhuaareawasinapostcollisional extensionalenvironmentTheenrichedmantlemagmaupwelledandsufferedcrustalassimilationandfractionalcrystallization,creating lotsofalkalinerocksDuringtheLatePermiantoTriassic,themicrocontinentscollidedwitheachother,andthestudyareawasunder postcollisionextensionalsettingThethickenedlowercrustwasheatedbymantlemagma,leadingtomixingofbasicandacid
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