| 东昆仑南缘布青山复合增生型构造混杂岩带组成特征及其形成演化过程 |
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| 引用本文： | 裴先治,李瑞保,李佐臣,刘成军,陈有炘,裴磊,刘战庆,陈国超,李小兵,王盟.东昆仑南缘布青山复合增生型构造混杂岩带组成特征及其形成演化过程[J].地球科学,2018,43(12):4498-4520. |
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| 作者姓名： | 裴先治 李瑞保 李佐臣 刘成军 陈有炘 裴磊 刘战庆 陈国超 李小兵 王盟 |
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| 作者单位： | 1.长安大学地球科学与资源学院, 西部矿产资源与地质工程教育部重点实验室, 自然资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710054 |
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| 基金项目： | 中央高校基本科研业务费专项资金项目310827161006中央高校基本科研业务费专项资金项目310827161002中央高校基本科研业务费专项资金项目CHD2011TD020中央高校基本科研业务费专项资金项目2013G1271092中央高校基本科研业务费专项资金项目310827173702国家自然科学基金项目41172186中央高校基本科研业务费专项资金项目2013G1271091青海省国土资源厅-中国铝业公司公益性区域地质矿产调查基金项目200801国家自然科学基金项目41472191国家自然科学基金项目41502191 |
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| 摘 要： | 为了研究东昆仑南缘布青山复合增生型构造混杂岩带的物质组成、构造属性及形成演化历史，在前人资料基础上从构造混杂岩带物质组成、形成时代、构造属性等方面对其进行综合研究.研究结果表明，布青山复合增生型构造混杂岩带是一条分隔东昆仑造山带与巴颜喀拉造山带的增生型构造边界，主要由元古代-古生代不同构造属性的大型构造混杂岩块与混杂基质组成.构造混杂岩块包括中元古代中深变质基底岩块（苦海岩群）、寒武纪蛇绿岩岩块、奥陶纪蛇绿岩岩块、石炭纪蛇绿岩岩块、石炭纪洋岛/海山玄武岩岩块、奥陶纪中酸性弧岩浆岩岩块、格曲组磨拉石沉积等.基质岩系主要为一套强烈构造变形的早中二叠世马尔争组浊积岩系.该混杂岩带记录了东昆仑南缘布青山地区东特提斯洋（布青山洋）自新元古代晚期开启以来，从晚寒武世-中三叠世长期持续向北的洋壳消减及俯冲增生过程，并于中三叠世晚期布青山洋消减完毕而使巴颜喀拉地块与东昆仑地块碰撞拼合.该次造山事件导致了不同类型、不同时代构造岩块与马尔争组浊积岩强烈混杂，最终形成了布青山复合增生型构造混杂岩的基本构造格架.
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| 关 键 词： | 东昆仑 蛇绿岩 布青山 构造混杂岩 俯冲作用 原特提斯洋 构造地质学 |
| 收稿时间： | 2018-04-07 |
Composition Feature and Formation Process of Buqingshan Composite Accretionary Mélange Belt in Southern Margin of East Kunlun Orogen |
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| Abstract: | In order to study the material composition, tectonic affinity and evolution history of the Buqingshan composite accretionary mélange belt in the southern margin of East Kunlun orogen, we make a comprehensive study on the composition, formation age and tectonic affinities of the mélange belt based on the previous data. This research shows that the Buqingshan composite accretionary mélange belt is a tectonic boundary of accretionary tectonic belts separating the East Kunlun tectonic belt and Bayanhar tectonic belt, and is composed of large-scale tectonic mélange rock blocks and matrices with different tectonic properties formed in Proterozoic-Paleozoic. Tectonic mélange blocks mainly include the Mesoproterozoic metamorphic basement rocks (Kuhai complex), Cambrian ophiolite rocks, Ordovician ophiolite rocks, Carboniferous ophiolite rocks, Carboniferous oceanic island/seamount basalt rocks, Ordovician island arc magmatite rocks, and Gequ Formation etc.. The matrices rocks are mainly composed of a series of Maerzheng Formation turbidite strata with strong deformation. This mélange belt records geological events that the East Tethys Ocean (Paleo-Buqingshan Ocean) opened since the Late Neoproterozoic in the Buqingshan area, southern margin of the East Kunlun orogen, subducted northward from Late Cambrian to Middle Triassic in a continuing subduction process, and ultimately closed at the end of the Middle Triassic. This subduction and collision events led to a strong intermixing of different types tectonic blocks with the turbidites, and finally formed the key tectonic framework of the Buqingshan composite accretionary mélange belt. |
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