| 西昆仑麻扎构造混杂岩带侏罗系的再厘定 |
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| 引用本文： | 张杰,;陈琳,;侯明才,;康孔跃.西昆仑麻扎构造混杂岩带侏罗系的再厘定[J].西北地质,2014(4):105-113. |
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| 作者姓名： | 张杰 ;陈琳 ;侯明才 ;康孔跃 |
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| 作者单位： | [1]四川省核工业地质局二八二大队,四川德阳618000; [2]成都理工大学沉积地质研究院,四川成都610059 |
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| 基金项目： | 中国地质调查局“新疆1：5万J43E022021等五幅区调”（项目编号：1212011120539）、“新疆1：5万J43E022019等五幅区调”（项目编号：1212011120538） |
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| 摘 要： | 在新疆叶城县的西昆仑麻扎构造混杂岩带内,发育一套含煤砂砾岩地层,原陕西省地质调查院在1∶25万区域地质调查中,将其划分为3个地层填图单元,即三叠系(T,未分)、三叠系赛力亚克达坂群(TS)和早—中侏罗世叶尔羌群(J1-2Y)。这些碎屑岩主体是造山作用形成的山间磨拉石沉积,但各地层单元之间多为断层接触,顶底不全,岩石地层之间的新老关系和形成时代也不清楚。通过对该套碎屑岩的详细剖面测制和分析,依据其岩石组合特征、生物地层特征对比,将该套含煤砂砾岩重新厘定为早—中侏罗世叶尔羌群(J1-2Y),并自下而上再划分为:莎里塔什组(J1s^)、杨叶组(J2y)、塔尔尕组(J2t)。它们主要是一套河湖相沉积的地层,是对西昆仑构造混杂岩带在早—中侏罗世隆起造山的沉积响应。
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| 关 键 词： | 构造混杂岩带 侏罗世 再厘定 西昆仑 |
Redefinition of the Jurassic Strata of the Mazha Tectonic Melange in West Kunlun |
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| Institution: | ZHANG Jie , CHEN Lin , HOU Ming-cai , KANG Kong-yue (1. No. 282 Geological Party, Sichuan Bureau of Geology for Nuclear Industry, De＇ yang 618000, China; 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China) |
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| Abstract: | In the Yecheng County, there exists a set of coal-bearing sandy conglomerate formation in the Mazha tectonic mflange of West Kunlun. Shaanxi Geological Investigation Institute divided this formation into three units in the 1 ： 250000 regional geological survey, i. e. Triassic （T, non-layered）, Triassic Sailiyakedaban Group （TS）, and early-middle Jurassic Yarkant Group （J1-2Y）. These clastic rocks were mainly intermountain molasses formed by orogenesis, but the contacts between all strata were faults. Except for the incomplete top and bottom, the sedimenta- ry sequence and age of all strata were also without knowledge. By the measurement and analysis on the clastic rocks, and according to the rock assemblages and biostratigraphic characteristics, this set of coal-bearing sandy conglomerate can be redefined as early-middle Jurassic Yarkant Group which can be further divided into three units from the bottom to the top： the Shalitashi Formation （J1S）, Yangye Formation （J2y）, and Targa Formation （J2t）. They were fluvio- lacustrine strata and sedimentary response to the early-middle Jurassic orogenesis in the tectonic m61ange belt of West Kunlun. |
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| Keywords: | tectonic melange belt Jurassic redefinition West Kunlun |
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