新疆哈密大水一带天湖岩群斜长角闪岩地球化学特征、锆石U-Pb定年及地质意义  

The Geochemical Features,Zircon U-Pb Dating and Significance of Tianhu Rock Group Amphibolites

作　　者：韩飞 曾华栋[2] 贾红旭[2] 李卫东[2] 张磊 藏梅[1,4] 沈宏飞 Han Fei;Zeng Huadong;Jia Hongxu;LIWeidong;Zheng Lei;Zang Mei;Shen Hongfei(Key Laboratory of Xinjiang Coal Resources Green Mining(Xinjiang Institute of Engineering),Ministry of Education,Urumqi,Xinjiang,830023,China;No.6 Geology Brigade,Xinjiang Bureau of Geological Survey,Hami,Xinjiang,839000,China;Exploration Unit of North China Geological Exploration,Bureau,Sanhe,Hebei,065200,China;Xinjiang Natural Environment and Ecological Environment Researcl Center,Urumqi,Xinjiang,830023,China)

机构地区：[1]新疆工程学院新疆煤炭资源绿色开采教育部重点实验室,新疆乌鲁木齐830023 [2]新疆维吾尔自治区地质矿产勘查开发局第六地质大队,新疆哈密839000 [3]华北地质勘查局综合普查大队,河北三河065200 [4]新疆自然资源与生态环境研究中心,新疆乌鲁木齐830023

出　　处：《新疆地质》2024年第4期493-501,共9页Xinjiang Geology

基　　金：新疆地质勘查基金大水一带1∶5万六幅区域地质矿产专项调查(T16-1-LQ15);新疆维吾尔自治区自然科学基金青年基金新疆白鑫滩铜镍矿成因矿物学研究(2021D01B97);天池英才地表原生晕及构造地球化学在穆呼锰矿找矿中的研究与应用示范项目(2024XGYTCYC11)共同资助。

摘　　要：斜长角闪岩是天湖岩群分布较广的岩石之一。通过对天湖岩群斜长角闪岩的地质、岩石地球化学特征及年代学进行研究。结果表明,天湖岩群斜长角闪岩原岩为变质基性火山岩类,显示较复杂的地球化学特征。锆石UPb定年表明斜长角闪岩原岩可能形成于元古代(1731±33)Ma,经历了中元古代的变质作用。综合分析认为,东天山天湖岩群出露的地区存在早元古代岩浆活动,可能发育太古代基底,斜长角闪岩经历了漫长且复杂的构造演化过程,与库鲁克塔格地区具有可比性,共同经历了Columbia超大陆的聚合和裂解,同为中元古代早期Columbia超大陆裂解的产物,经历了哥伦比亚超大陆裂解向罗迪尼亚超大陆转换的过程。The Tianhu Rock Group contains a widespread distribution of amphibolites.This study investigates the geology,petrology,geochemistry,and geochronology of the amphibolites in the Tianhu Rock Group.The results indicate that the protolith of the Tianhu Rock Group's amphibolites is a metamorphosed mafic volcanic rock,exhibiting complex geochemical characteristics.Zircon U-Pb dating suggests that the protolith likely formed during the Proterozoic(1,731±33 Ma)and subsequently underwent metamorphism in the Mesoproterozoic.Integrative analysis suggests the presence of early Proterozoic magmatic activity in the exposed areas of the Tianhu Rock Group in eastern Tianshan,with a possible Archean basement.The amphibolites have experienced an extended and complex tectonic evolution,comparable to that of the Kuruktag region.Both regions underwent the assembly and breakup of the Columbia supercontinent,with the amphibolites in particular representing an early Mesoproterozoic product of Columbia's disintegration.This progression reflects the tectonic transition from the breakup of Columbia to the emergence of the Rodinia supercontinent.

关 键 词：天湖岩群 斜长角闪岩 地球化学 锆石U-Pb定年 地质意义 

分 类 号：P59[天文地球—地球化学] P597[天文地球—地质学]