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首页> 外文期刊>Journal of Asian earth sciences >Tectonic amalgamation of the Gaoligong shear zone and Lancangjiang shear zone, southeast of Eastern Himalayan Syntaxis
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Tectonic amalgamation of the Gaoligong shear zone and Lancangjiang shear zone, southeast of Eastern Himalayan Syntaxis

机译：东喜马拉雅山脉东南部的高黎贡剪切带和澜沧江剪切带的构造融合

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摘要

The Gaoligong shear zone (GLGSZ) and Lancangjiang shear zone (LCJSZ) are two major large-scale shear zones southeast of Eastern Himalayan Syntaxis (EHS) and play important roles in the accommodation of the intracontinental deformation in Southeast Asia. The two shear zones, which are mainly composed of high-grade metamorphic rocks and have long been regarded as the Precambrian basement of this area, are gradually merged northward and become tectonically amalgamated from Fugong to Gongshan area. Structural and kinematic analyses reveal that the amalgamation area has experienced strongly partitioned dextral transpression. N-S trending tight to isoclinal folds, sub-vertical foliation and subhorizontal lineation are ubiquitously developed both within the shear zones and the Carboniferous flysch sediments of Baoshan block in between. Micro- and macro-kinematic indicators such as CS structures, rotated porphyroclasts, asymmetric shear folds, sheath folds, domino and boudin structures suggest that the shear sense of the GLGSZ and LCJSZ is dextral in the amalgamation area. Comparative analyses of strata reveal that the Baoshan block is aligned with south Qiangtang block and the Lanping-Simao block was aligned with north Qiangtang block prior to the Cenozoic large scale tectonic extrusion and rotation. The amalgamation area, which has progressively switched positions from northeast of EHS to east and southeast of EHS, is just located at the neck of the large scale boudin of south Qiangtang-Baoshan block. A boudin model is proposed for the tectonic amalgamation of the GLGSZ and LCJSZ from Fugong to Gongshan area in response to the continued northward convergence between Indian plate and Eurasian plate since early Eocene, resistance of South China block, southeastward extrusion and clockwise rotation of Baoshan block around EHS. (C) 2015 Elsevier Ltd. All rights reserved.
机译：高黎贡剪切带（GLGSZ）和澜沧江剪切带（LCJSZ）是东喜马拉雅句法（EHS）东南部的两个主要的大型剪切带，在调节东南亚的陆内变形中起着重要的作用。这两个剪切带主要由高级变质岩组成，长期以来一直被认为是该地区的前寒武纪基底，然后逐渐向北合并，从福宫到贡山地区发生了构造上的合并。结构和运动学分析表明，合并区经历了强烈分区右旋压迫。 N-S趋向于等距褶皱，在剪切带和宝山石炭系复石沉积物之间均普遍发育亚垂直叶状和亚水平线。微观和宏观运动学指标，如CS结构，旋转的卟啉，不对称剪切褶皱，鞘褶皱，多米诺骨牌和布丁结构，表明GLGSZ和LCJSZ的剪切感在合并区域中是右旋的。地层的对比分析表明，在新生代大规模构造挤压和旋回之前，宝山地块与Qian塘南区块对齐，兰坪-思茅区块与北tang塘区块对齐。合并区的位置逐渐从EHS的东北向EHS的东部和东南方向切换，该区域位于Qian塘-宝山南段大型布丁的颈部。针对早始新世以来印度板块与欧亚板块继续向北汇聚，华南块体的阻力，东南挤压和宝山块体的顺时针旋转，提出了从福宫到贡山地区的GLGSZ和LCJSZ构造合并的boudin模型。围绕EHS。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第1期|64-78|共15页
  • 作者

    Huang Xuemeng; Xu Zhiqin; Li Huaqi; Cai Zhihui;

  • 作者单位

    Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China|Peking Univ, Dept Geol, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China|China Earthquake Adm, Inst Crustal Dynam, Key Lab Crustal Dynam, Beijing 100085, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Shear zone; Eastern Himalayan Syntaxis; Tectonic amalgamation; Boudin model;

    机译：剪切带;东部喜马拉雅句法;构造融合;布丁模型;

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