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北阿尔金恰什坎萨依沟地区早古生代构造变形特征及构造演化启示

吴玉 陈正乐 陈柏林 王永 孟令通 孙岳 何江涛 王斌 张文高

吴玉, 陈正乐, 陈柏林, 等, 2019. 北阿尔金恰什坎萨依沟地区早古生代构造变形特征及构造演化启示. 地质力学学报, 25 (3): 301-312. DOI: 10.12090/j.issn.1006-6616.2019.25.03.028
引用本文: 吴玉, 陈正乐, 陈柏林, 等, 2019. 北阿尔金恰什坎萨依沟地区早古生代构造变形特征及构造演化启示. 地质力学学报, 25 (3): 301-312. DOI: 10.12090/j.issn.1006-6616.2019.25.03.028
WU Yu, CHEN Zhengle, CHEN Bailin, et al., 2019. EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION. Journal of Geomechanics, 25 (3): 301-312. DOI: 10.12090/j.issn.1006-6616.2019.25.03.028
Citation: WU Yu, CHEN Zhengle, CHEN Bailin, et al., 2019. EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION. Journal of Geomechanics, 25 (3): 301-312. DOI: 10.12090/j.issn.1006-6616.2019.25.03.028

北阿尔金恰什坎萨依沟地区早古生代构造变形特征及构造演化启示

doi: 10.12090/j.issn.1006-6616.2019.25.03.028
基金项目: 

国家自然科学基金 41802218

"十二五"国家科技支撑计划项目 2011BAB06B08-04

中国核工业地质局铀矿地质科研项目 地D1902

详细信息
    作者简介:

    吴玉(1987-), 男, 博士, 工程师, 从事区域构造与岩石大地构造研究。E-mail:21wu.yu@163.com

  • 中图分类号: P542;P534.4

EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION

  • 摘要: 出露在青藏高原北缘的红柳沟-拉配泉蛇绿混杂岩带一直以来为深入研究北阿尔金早古生代构造格架及演化提供了宝贵信息。经详细的野外地质填图和构造解析,文章针对红柳沟-拉配泉蛇绿混杂岩带内的构造样式、变形特征及形成时限进行研究,将北阿尔金蛇绿混杂岩带进一步细分为北侧混杂单元、中间层序单元和南侧混杂单元三个次级构造单元,南、北两侧混杂单元内以发育一系列复杂褶皱和逆冲断层为典型构造特征。卷入褶皱变形的最年轻地层岩石为中-晚奥陶世硅质岩,并被(416.8±3.7)Ma未变形的正长斑岩脉所截切;卷入逆冲断层的混杂岩中辉长岩和斜长花岗岩年龄为479~521 Ma和512.1~518.5 Ma,随后也被410.7~418.5 Ma未变形的冰沟岩体所侵位。这些基本事实表明,褶皱构造与逆冲断层均形成于中奥陶世-早泥盆世,推测其成因与北阿尔金洋俯冲作用导致的洋壳强烈缩短变形有关。在南侧混杂单元,褶皱构造样式自北向南逐渐由直立褶皱转变为斜歪褶皱,最后转变为倒转褶皱,显示出递进变形特征。褶皱所对应的应变椭球体也发生了旋转,表现出顶端指向北北东向的剪切作用,与混杂单元内逆冲断层所具有的向北北东方向逆冲、推覆特征相一致,从而推测它们与北阿尔金洋南南西向俯冲消减有密切联系。另外,在北侧混杂单元内还发育有同时期向南南东方向逆冲的断层以及轴面倾向北北东的斜歪褶皱,暗示北阿尔金洋在早古生代可能还发育有北北东方向的俯冲极性,整个北阿尔金洋俯冲消减模式可能具有双向性。

     

  • 图  1  北阿尔金大地构造位置及其区域地质简图

    a-青藏高原大地构造格架图; b-阿尔金山构造简图[10]; c-北阿尔金区域地质简图[21~22]

    Figure  1.  Geotectonic location and simplified regional geological map of North Altun

    图  2  北阿尔金恰什坎萨依沟蛇绿混杂岩构造地质图及其典型褶皱构造的野外照片

    a—南侧混杂单元内发育的紧闭直立褶皱;b—南侧混杂单元内发育的宽缓直立褶皱;c—南侧混杂单元内发育的斜歪褶皱;d—北侧混杂单元内发育的斜歪褶皱;e—南侧混杂单元内发育的倒转褶皱

    Figure  2.  Detailed structural map of the ophiolitic mélange and field photographs of typical folds in the Qiashenkansayigou area, North Altun

    图  3  恰什坎萨依地区正长斑岩脉野外、镜下照片以及岩脉的锆石年龄特征

    Kfs—钾长石;Q—石英
    a—正长斑岩脉野外产出照片;b—正长斑岩脉显微镜下照片;c—正长斑岩脉锆石阴极发光图像;d—正长斑岩脉锆石U-Pb年龄谐和图

    Figure  3.  Field and microscope photographs of the syenite porphyry dyke in the Qiashenkansayigou area and its zircon age characteristics

    图  4  北阿尔金恰什坎萨依沟构造剖面图及其逆冲断层野外照片和赤平投影

    a、b—南侧混杂单元内发育的逆冲断层;c、d—北侧混杂单元内发育的逆冲断层;e—恰什坎萨依沟构造剖面图及其逆冲断层赤平投影

    Figure  4.  Cross section of the ophiolitic mélange and stereographic projections showing structural characteristics of thrust faults in the Qiashenkansayigou area, North Altun

    图  5  北阿尔金恰什坎萨依沟地区南侧混杂单元内递进褶皱变形的示意图

    Figure  5.  Schematic diagram of progressive fold deformation in the south incoherent units, Qiashenkashayi area, North Altun

    表  1  恰什坎萨依沟南侧混杂单元内的正长斑岩脉SHRIMP锆石U-Pb分析结果

    Table  1.   SHRIMP U-Pb dating for zircons of syenite porphyry dyke in the south incoherent units in Qiashenkansayigou area

    测点号 U
    (×10-6)
    Th
    (×10-6)
    232Th/
    238U
    238U/
    206Pb
    误差
    (±%)
    207Pb/
    206Pb
    误差
    (±%)
    206Pb/
    238U
    误差
    (±%)
    207Pb/
    206Pb
    误差
    (±%)
    206Pb/
    238U(Age)
    误差
    (1σ)
    206Pb/238U
    (Age)
    误差
    (1σ)
    1 82.79 33.98 0.42 15.11 1.6 0.0603 3.3 0.0564 3.6 0.0659 1.6 410.4 ±6.4 411.2 ±6.9
    2 173.63 109.75 0.65 14.95 1.2 0.0565 2.3 0.0551 2.3 0.06675 1.2 416.6 ±5.0 416.6 ±5.5
    3 109.22 96.02 0.91 15.19 1.4 0.057 3.7 0.0514 4.2 0.06536 1.4 409.9 ±5.7 408.2 ±6.7
    4 375.01 112.39 0.31 15.19 1 0.05662 1.6 0.05569 1.6 0.06574 1 410.1 ±4.1 410.5 ±4.2
    5 206.98 182.76 0.91 14.23 1.1 0.0801 1.8 0.0564 2.7 0.0682 1.1 424.7 ±4.8 425.3 ±5.9
    6 237.47 147.68 0.64 15.18 1.1 0.0571 1.9 0.0581 1.9 0.06596 1.1 410.2 ±4.4 411.8 ±4.9
    7 309.51 175.31 0.59 15.05 1 0.0563 2.1 0.0551 2.2 0.06637 1 414.2 ±4.2 414.2 ±4.5
    8 185.84 92.24 0.51 14.66 1.2 0.0572 2.1 0.0564 2.2 0.06816 1.2 424.5 ±4.9 425.1 ±5.2
    9 152.35 78.41 0.53 14.1 1.2 0.09 2.3 0.0535 4.1 0.06772 1.2 423.3 ±5.1 422.4 ±6.1
    10 82.26 69.46 0.87 14.49 1.5 0.059 3.3 0.0464 4.2 0.068 1.5 428.4 ±6.5 423.9 ±7.6
    11 414.50 177.60 0.44 14.89 0.97 0.05587 1.5 0.05528 1.5 0.06711 0.97 418.7 ±4.0 418.7 ±4.2
    12 298.76 126.04 0.44 14.97 1 0.05579 1.8 0.05764 1.7 0.06695 1 416.5 ±4.3 417.8 ±4.5
    13 360.34 166.38 0.48 14.58 1.3 0.05641 1.6 0.05656 1.6 0.06862 1.3 427.2 ±5.4 427.9 ±5.9
    14 267.46 165.00 0.64 14.86 1.1 0.0585 1.9 0.0566 2 0.06715 1.1 418.2 ±4.6 418.9 ±5.0
    注:误差为1σ; Pbc和Pb分别代表普通铅和放射性成因铅; ①为假设206Pb/238U-204Pb/232 Th年龄谐和校正普通铅; ②为假设206Pb/238U-207Pb/238U年龄谐和校正普通铅
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  • 收稿日期:  2018-12-26
  • 修回日期:  2019-04-10
  • 刊出日期:  2019-06-01

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