陈柏林, 曹富根, 赵树铭, 李传班, 赵恒乐, 李佳, 陈正乐, 任燕, 李艳, 刘崴国, 李建军, 黄家涛, 杨屹, 崔玲玲. 阿尔金山东段大平沟地区褶皱构造的特征及其成因[J]. 地质通报, 2011, 30(12): 1934-1940.
    引用本文: 陈柏林, 曹富根, 赵树铭, 李传班, 赵恒乐, 李佳, 陈正乐, 任燕, 李艳, 刘崴国, 李建军, 黄家涛, 杨屹, 崔玲玲. 阿尔金山东段大平沟地区褶皱构造的特征及其成因[J]. 地质通报, 2011, 30(12): 1934-1940.
    CHEN Bai-lin, CAO Fu-gen, ZHAO Shu-ming, LI Chuan-ban, ZHAO Heng-le, LI Jia, CHEN Zheng-le, REN Yan, LI Yan, LIU Wei-guo, LI Jian-jun, HUANG Jia-tao, YANG Yi, CUI Ling-ling. Fold structure and its origin in Dapinggou area, eastern Altun Mountains[J]. Geological Bulletin of China, 2011, 30(12): 1934-1940.
    Citation: CHEN Bai-lin, CAO Fu-gen, ZHAO Shu-ming, LI Chuan-ban, ZHAO Heng-le, LI Jia, CHEN Zheng-le, REN Yan, LI Yan, LIU Wei-guo, LI Jian-jun, HUANG Jia-tao, YANG Yi, CUI Ling-ling. Fold structure and its origin in Dapinggou area, eastern Altun Mountains[J]. Geological Bulletin of China, 2011, 30(12): 1934-1940.

    阿尔金山东段大平沟地区褶皱构造的特征及其成因

    Fold structure and its origin in Dapinggou area, eastern Altun Mountains

    • 摘要: 大平沟地区位于北东向阿尔金走滑断裂北侧与东西向阿尔金北缘断裂所夹持的区域。区内出露卓阿布拉克组火山-沉积岩系,其中以灰黑色粉砂质泥岩为代表的沉积岩系出露宽度3~5km,是相邻20km的东侧喀腊大湾地区出露厚度(约1km)的3~5倍。通过野外详细的地质调查,特别是运用小褶皱分析方法、褶皱层理与轴面劈(片)理关系判别分析方法,首次对阿尔金山东段大平沟地区的卓阿布拉克组火山-沉积岩系中的沉积岩夹层沿剖面开展追索研究,恢复了大平沟地区褶皱构造的轮廓,并对其成因进行初步探讨。认为南侧喀腊达坂-阿克达坂断裂以南的元古宇碳酸盐岩系较强硬的岩层、北侧阿尔金北缘断裂以北的太古宇结晶基底的刚性岩块、以灰黑色粉砂质泥岩为代表的细碎屑岩的柔性特点、冰沟岩体隆升造成其东侧盖层向东收缩是基础,而北北东向区域挤压构造应力场作用下北东东向卓阿布拉克断裂的左行走滑造成的卓阿布拉克组沉积岩系西端的侧向挤压是褶皱形成的直接原因。

       

      Abstract: Dapinggou area of eastern Altun Mountains, is situated in the clamping area between NE-trending Altun strike-slip fault and EW-trending northern Altyn Mountains margin fault. There outcropping a series of volcano-sedimentary rocks of Zhuoabulake Formation. Among which, grayish black silt mudstone, as a deputy to the sedimentary rocks, outcrops about 3~5km in width, while there outcropping only about 1km in width in Kaladawan area only 20km eastern of the Dapinggou area. In this paper, after a detailed geological survey and investigation of the sedimentary rock section by means of minor fold analysis and discriminant analysis of the relation of the bedding and axial-place cleavage of fold, the authors for the first time take an attempt to restore the outline of fold structure in the Dapinggou area. Then the authors analysis the origin of the fold structure and consider that the basic condation for forming Dapinggou fold structure are the competent bed of the Proterozoic carbonatite southern of the Kaladaban-Akedaban fault, the rigid block of the Archeozoic crystalline basement northern of the EW-trending northern Altyn Mountains margin fault, the plastic strata of the grayish black silt mudstone of Zhuoabulake Formation and the strinkage to the east of the cover strata of the Binggou granite masscausing from the uplift of the granite mass. And the authors also believe that the direct cause is lateral compression in the western end of the sedimentary rock of Zhuoabulake Formation result from sinistral strike slip of the NEE-trending Zhuoabulake fault in the regional SN-trending compressive stress field.

       

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