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东昆仑东段下三叠统洪水川组沉积序列与盆地构造原型恢复
引用本文:李瑞保,裴先治,李佐臣,裴 磊,陈有炘,刘成军,陈国超,刘图杰.东昆仑东段下三叠统洪水川组沉积序列与盆地构造原型恢复[J].地质通报,2015,34(12):2302-2314.
作者姓名:李瑞保  裴先治  李佐臣  裴 磊  陈有炘  刘成军  陈国超  刘图杰
作者单位:1.长安大学西部矿产资源与地质工程教育部重点实验室,陕西 西安 710054; 2.长安大学地球科学与资源学院,陕西 西安 710054; 3.中国地质大学(北京)地球科学学院,北京 100083; 4.南阳理工学院建筑与城市规划学院,河南 南阳 473004
基金项目:国家自然科学基金项目(批准号:41502191、41172186、41472191、40972136)、中央高校基本科研业务费专项资金项目(编号:CHD2011TD020、2013G1271091、2013G1271092)和青海省国土资源厅-中国铝业公司公益性区域地质矿产调查基金项目(编号:200801)
摘    要:下三叠统洪水川组沉积地层研究结果表明,洪水川组由底到顶可划分为6个岩性段,一段主要为灰绿-肝红色粗碎屑岩及紫红色细碎屑岩组合;二段主要为灰绿色含砾粗砂岩、粗砂岩夹砾岩组合;三段以深灰色-灰黑色薄层-中薄层灰岩为主,四段主要为浅灰色-灰色中-薄层粉砂岩夹灰色薄层灰岩组合,五段主要为鲍马序列中某几段有规律的浊积岩组合,六段主要为灰色中薄层细砾岩、含细砾粗砂岩、细砂岩夹薄层钙质粉砂岩及灰岩组合。岩石组合及沉积结构构造特征表明,洪水川组一段和二段属于扇三角洲沉积体系,三段和四段属于浅海混积陆棚沉积体系,五段属于半深海-深海浊流沉积体系,六段属于滨浅海沉积体系。洪水川组沉积序列与弧前盆地沉积序列相似,记录了一个弧前盆地初始沉积、正常沉积、晚期沉积等连续的沉积-构造演化过程,认为洪水川组是一套形成于阿尼玛卿-布青山古特提斯洋向北俯冲过程中的弧前盆地的产物,客观记录了东昆仑三叠纪弧前盆地形成及古洋壳俯冲过程。

关 键 词:东昆仑  洪水川组  沉积体系  弧前盆地  盆地原型

The depositional sequence and prototype basin for Lower Triassic Hongshuichuan Formation in the eastern segment of East Kunlun Mountains
LI Ruibao,PEI Xianzhi,LI Zuochen,PEI Lei,CHEN Youxin,LIU Chengjun,CHEN Guochao,LIU Tujie.The depositional sequence and prototype basin for Lower Triassic Hongshuichuan Formation in the eastern segment of East Kunlun Mountains[J].Geologcal Bulletin OF China,2015,34(12):2302-2314.
Authors:LI Ruibao  PEI Xianzhi  LI Zuochen  PEI Lei  CHEN Youxin  LIU Chengjun  CHEN Guochao  LIU Tujie
Abstract:Based on a study of typical sedimentary structure and sedimentary system of Hongshuichuan Formation, the authors analyzed the prototype basin. The Hongshuichuan Formation, from the bottom to the top, is divided into six rock members. The first rock member is mainly composed of grayish green gravel-bearing coarse conglomerate and purple fine clastic rock; the second rock member is mainly grayish green pebble-bearing coarse sandstone, coarse sandstone locally interbedded with conglomerate layer combinations; the third rock member is mainly composed of dark gray-grayish black thin-medium-thin-bedded limestone; the fourth rock member is mainly composed of light gray-gray medium-thin-bedded siltstone, medium-fine-grained sandstone; the fifth rock member is mainly the turbidity combination, composed of many sections of regular rhythm combinations in Bouma sequence; the sixth rock member is mainly composed of gray-gray and black medium-thin-bedded fine conglomerate, fine gravel-bearing sandstone, fine sandstone, interbedded with grayish black thin-bedded calcareous siltstone and a small amount of limestone as well as marl. The analysis of the rock assemblages and depositional structure shows that the first and second members belong to the fan-delta depositional system, the third and fourth rock members belong to the shallow diamictic shelf deposition system, the fifth rock member belongs to bathyal-deep-sea turbidity current depositional system and the sixth rock member belongs to the littoral (shallow sea) depositional system. The depositional sequence of Hongshuichuan Formation is similar to the forearc basin sedimentary sequence, which records the consecutive deposition process of initial deposition, normal deposition and late deposition in the forearc basin. Based on previous researches on the paleocurrent, arc magmatism and ophiolite mélange, the authors consider that Hongshuichuan Formation formed in the forearc basin, which recorded the process of formation of forarc basin and the subduction activity.
Keywords:East Kunlun orogeny  Hongshuichuan Formation  sedimentary system  forarc basin  prototype basin
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