| 青海格尔木市黑海地区三叠系巴颜喀拉山群变质碎屑岩地球化学特征及物源分析 |
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| 引用本文： | 佟鑫,周汉文,朱云海,林启祥,李益龙,毛武林,张赟昀,吴继光,马智勇.青海格尔木市黑海地区三叠系巴颜喀拉山群变质碎屑岩地球化学特征及物源分析[J].岩石矿物学杂志,2014,33(4):630-644. |
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| 作者姓名： | 佟鑫 周汉文 朱云海 林启祥 李益龙 毛武林 张赟昀 吴继光 马智勇 |
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| 作者单位： | 中国地质大学地球科学学院;中国地质大学地球物理与空间信息学院;广东省核工业地质局二九三大队;辽宁地质工程职业学院; |
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| 基金项目： | 国家自然科学基金青年基金项目(41202038);国土资源部区域地质调查项目(1212011086011);中国地质大学(武汉)中央高校基本科研业务费专项资金(CUG110804) |
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| 摘 要： | 巴颜喀拉地块位于青藏高原东北部,是古特提斯的主体,对其进行深入的研究不仅对确定古特提斯的演化过程与方式具有重要意义,而且对探讨该地区与古板块演化有关的成矿地质作用和矿产分布规律具有重要的现实意义。巴颜喀拉山群位于巴颜喀拉地块,对其物源研究较为薄弱。碎屑岩中的碎屑组分特征和地球化学特征可以反映物源区和沉积盆地的构造环境。本文通过对三叠系巴颜喀拉山群变碎屑岩岩相学特征、沉积结构特征、地球化学判别参数以及地球化学判别图解的研究,结合前人在这一地区所做的如古水流等相关工作,认为巴颜喀拉沉积盆地是在古老基底裂解的基础上形成的,存在裂陷扩张、海水加深的过程,具有大陆岛弧和活动大陆边缘型物源的特征,接受其北部东昆仑造山带碎屑的沉积,沉积物来自亲上地壳长英质源区。
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| 关 键 词： | 碎屑岩 岩石学 地球化学 巴颜喀拉山群 青海省 |
| 收稿时间： | 2013/10/22 0:00:00 |
| 修稿时间： | 2014/5/30 0:00:00 |
Geochemical characteristics and provenance analysis of the Triassic metasedimentary rocks of Bayan Har Group in Heihai area, Golmud City, Qinghai Province |
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| TONG Xin,ZHOU Han-wen,ZHU Yun-hai,LIN Qi-xiang,LI Yi-long,MAO Wu-lin,ZHANG Yun-yun,WU Ji-guang and MA Zhi-yong.Geochemical characteristics and provenance analysis of the Triassic metasedimentary rocks of Bayan Har Group in Heihai area, Golmud City, Qinghai Province[J].Acta Petrologica Et Mineralogica,2014,33(4):630-644. |
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| Authors: | TONG Xin ZHOU Han-wen ZHU Yun-hai LIN Qi-xiang LI Yi-long MAO Wu-lin ZHANG Yun-yun WU Ji-guang and MA Zhi-yong |
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| Institution: | Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, 430074, China;No. 293 Geological Party, Guangdong Nuclear Industry Geological Bureau, Guangzhou 510800, China;Liaoning Geological Engineering Vocational College, Dandong 118008, China |
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| Abstract: | The Bayan Har block, as the main body of Tethys, is located in the northeast of the Tibetan Plateau. In-depth study in this area is not only of great importance for determining the evolution of Tethys but also of important practical significance for the research on metallogenesis related to tectonic evolution and minerals distribution in this area. The Bayan Har Group is located in the Bayan Har block, where the research on its provenance is insufficient. Its detrital and chemical components can reflect the features of the provenance and tectonic setting. The authors'' researches on petrological characteristics, depositional setting, geochemical indices and geochemical discrimination diagrams of clastic rocks of the Bayan Har Group, together with previous researches on paleocurrent of Bayan Har Group clastic rocks, suggest that the Bayan Har Triassic sedimentary basin was based on the splitting of the old basement, the process of rift expansion did exist, the depth of water was increased, the tectonic setting was mainly characterized by the continental island arc and active continental margin, and the deposited sediments was derived from felsic rocks of upper continental crust of East Kunlun orogenic belt in the north. |
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| Keywords: | clastic rocks petrology geochemistry Bayan Har Group Qinghai Province |
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