| 新疆东准噶尔地区老君庙岩群时代厘定、原岩恢复及对基底的指示意义 |
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| 引用本文： | 杨硕,刘阁,靳刘圆,郑海峰,王盛栋.新疆东准噶尔地区老君庙岩群时代厘定、原岩恢复及对基底的指示意义[J].地质通报,2020(1):7-17. |
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| 作者姓名： | 杨硕 刘阁 靳刘圆 郑海峰 王盛栋 |
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| 作者单位： | 新疆地质调查院;中国地质科学院地球物理地球化学勘查研究所 |
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| 基金项目： | 中央返还两权价款项目(编号:A16-1-LQ17);中国地质调查局项目《中国新疆区域地质调查片区总结与服务产品开发》(编号:DD20160345-04)、《新疆矿产资源调查成果综合集成与服务产品开发》(编号:DD20160346) |
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| 摘 要： | 老君庙岩群出露于准噶尔盆地东北緣,发育一套高绿片岩相-角闪岩相变质岩,其形成时代和构造背景长期以来存在争议。对钾长糜棱片岩进行锆石U-Pb定年,结果显示老君庙岩群年龄值主要集中在500~54OMa之间,少数为新元古代早期(740~920Ma),根据最年轻的峰值年龄(约520Ma)将老君庙岩群时代重新厘定为早寒武世。利用岩石地球化学特征对老君庙岩群进行原岩恢复,显示其具有大陆壳的特征,原岩建造类似复理石建造,其形成的构造环境应属陆緣海环境。关于准噶尔盆地基底属性的问题一直没有定论,通过本次研究,结合区域资料,认为东准噶尔地区存在前寒武基底。
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| 关 键 词： | 老君庙岩群 锆石U-PB 原岩恢复 东准噶尔 基底 |
Dating and reconstruction of protoliths of the Laojunmiao Group and its indications for basement in eastern Junggar,Xinjiang |
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| YANG Shuo,LIU Ge,JIN Liuyuan,ZHENG Haifeng,WANG Shengdong.Dating and reconstruction of protoliths of the Laojunmiao Group and its indications for basement in eastern Junggar,Xinjiang[J].Geologcal Bulletin OF China,2020(1):7-17. |
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| Authors: | YANG Shuo LIU Ge JIN Liuyuan ZHENG Haifeng WANG Shengdong |
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| Institution: | (Institute of Gelogical Surveyof Xinjiang,Urumqi 830000,Xinjiang,China;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,Hebei,China) |
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| Abstract: | The Laojunmiao Group which is exposed on the northeastern margin of the Runggar basin consists of metamorphic complex of high greenschist facies to amphibolite facies.Its formation age and tectonic setting has been controversial for a long time.Zircon U-Pb dating of K-feldspar mylonite schist yielded a number of ages which are mostly concentrated on 500~544Ma with,a few belonging to early Neoproterozoic(740~920Ma).According to the youngest peak age(~520Ma),the age of Laojunmiao Group is redefined as early Cambrian.The lithogeochemical characteristics of Laojunmiao Group show that it has the characteristics of the continental crust,the protoliths formation is similar to a set of flysch formation and its tectonic environment should belong to the continental margin sea.As the problem in regard of the basement properties of funggar basin has not been conclusive yet,the results of this study in combination with,regional data can prove the existence of Precambrian basement in Eastern Junggar. |
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| Keywords: | Laojunmiao Group zircon U-Pb reconstruction of protoliths Eastern Junggar basement |
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