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柴达木东缘碰撞系统划分

杨立功 刘继顺 于换涛 刘文恒 尹利君

杨立功, 刘继顺, 于换涛, 等, 2013. 柴达木东缘碰撞系统划分. 地质力学学报, 19 (1): 72-81.
引用本文: 杨立功, 刘继顺, 于换涛, 等, 2013. 柴达木东缘碰撞系统划分. 地质力学学报, 19 (1): 72-81.
YANG Li-Gong, LIU Ji-Shun, YU Huan-Tao, et al., 2013. DIVISION OF SUBDUCTION-COLLISION SYSTEM IN THE EASTERN QAIDAM BASIN. Journal of Geomechanics, 19 (1): 72-81.
Citation: YANG Li-Gong, LIU Ji-Shun, YU Huan-Tao, et al., 2013. DIVISION OF SUBDUCTION-COLLISION SYSTEM IN THE EASTERN QAIDAM BASIN. Journal of Geomechanics, 19 (1): 72-81.

柴达木东缘碰撞系统划分

基金项目: 

国家115科技支撑计划课题"柴达木南北缘铅锌矿成矿规律及大型资源基地评价技术示范研究" 编号:2006BAA01B06

详细信息
    作者简介:

    杨立功(1962-), 男, 河南省南阳市人, 博士研究生, 高级工程师, 主要从事地质成矿预测及勘探。E-mail:13768136088@139.com

  • 中图分类号: P588.1

DIVISION OF SUBDUCTION-COLLISION SYSTEM IN THE EASTERN QAIDAM BASIN

  • 摘要: 基于前人对于柴达木东南缘北北西向鄂拉山岩浆带的研究成果,结合研究区火山-岩浆岩、蛇绿岩和沉积地层的形成时代、环境、分布规律、构造发育以及热力学环境和重磁地球物理异常等因素,认为鄂拉山岩浆弧是松潘-甘孜板块以阿尼玛卿蛇绿岩带为缝合线向北俯冲的产物。在整个闭合过程中,深部发生了滑脱,浅部碰撞前为半岛+拗拉槽+洋岛+海槽的基本格局,构造运动经历了洋壳俯冲消减、陆内碰撞造山和地壳伸展3个阶段,区内花岗岩的起因,始于洋壳俯冲,发展于陆内碰撞,因而,所发育的岩浆岩具有I-S过渡型花岗岩的特征,是海西晚期-燕山早期构造运动的地质记录。通过演绎这一发展过程,划分了柴达木东南缘岩浆岩带的碰撞体系。

     

  • 图  1  鄂拉山地区地质简图

    1—断裂带及编号(F1—野狐峡-塘断裂;F2—温泉-哇洪山断裂;F3—东昆仑北断裂;F4—东昆仑中断裂;F5—东昆仑南断裂;F6—布青山南坡断裂);2—柴达木地块早中生代克拉通化地层;3—二叠纪岛弧火山岩系;4—三叠纪火山岩及前陆盆地复理石沉积;5—石炭-二叠纪浅海碳酸盐岩;6—二叠纪花岗岩;7—蛇绿混杂岩;8—三叠纪花岗岩;9—平移断层;10—推覆构造;11—古缝合线;12—第四系;

    Figure  1.  Simplified geological map of ELA-mountain area

    图  2  鄂拉山地区重磁异常图

    Figure  2.  Regional gravity & magnetic survey map of ELA-mountain

    图  3  鄂拉山大地构造相剖面示意图

    Figure  3.  Tectonic facies profile map of ELA-mountain

    图  4  柴达木盆地东缘岩浆分布简图

    (据袁万明)

    Figure  4.  Indosinian granitoid distribution sketch of the eastern QTM Basin

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  • 收稿日期:  2012-10-20
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