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首页> 外文期刊>Journal of structural geology >Lateral subhorizontal middle to lower crustal flow in response to continental collision: Evidence from the Diancang Shan complex along the Ailao Shan-Red River belt, Southeastern Tibetan Plateau
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Lateral subhorizontal middle to lower crustal flow in response to continental collision: Evidence from the Diancang Shan complex along the Ailao Shan-Red River belt, Southeastern Tibetan Plateau

机译：横向脱象中间以较低的地壳流动响应大陆碰撞：来自泰国山红江腰部的滇沧山复合物的证据，东南藏高原

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摘要

How middle to lower crust in Southeastern Tibetan Plateau flowed in response to the Indian-Eurasian continental collision remains hotly debated in the last decades. Metamorphic complexes along crustal mobile zones, e.g., the Diancang Shan (DCS) complex along the Ailao Shan-Red River (ASRR) metamorphic belt may provide key knowledge on our understanding of the middle-lower crustal flow during the collision. In this contribution, integrated structural, microstructural, kinematic, and thermo-chronological studies of the DCS complex reveal that the complex constitutes a destructed A-type dome. High-grade metamorphic rocks of Proterozoic protoliths form the core (Unit I) that is covered by low-grade metamorphic rocks of Mesozoic age in the limbs (Unit II). The eastern limb of the DCS dome is cut by a normal shear zone (Unit III). Three phases (D-1, D-2 and D-3) of Cenozoic deformation structures are recognized in the complex. The D-1 and D-2 structures constitute the dominant structural style of the Units I and II. The D-1 structures consist of penetrative S-1 foliations, mineral lineations (L-1), symmetrical intrafolial folds (F-1) and tectonic lenses of granitic and quartz veins in rocks from the Units I and II. Mylonitic foliations (S-2//S-1), NNW-SSE plunging subhorizontal stretching lineations (L-2), widespread A-type folds (F-2), asymmetric porphyroclasts and tectonic lenses form the dominant structural styles in the D-2 deformation. D-3 structures are new foliations 53 and hot striae L-3 in the normal-slipping shear zone (Unit III). The S-2//S-1 foliations define the domal framework of the DCS complex, which is truncated by the D-3 shear zone. The dome is NW-SE elongated and has a hinge line paralleling to the L-2//L-1 stretching lineations. Synthetic analysis of structural and microstructural styles, and kinematic vorticity data estimated by rotated rigid porphyroclast method (0.38-0.69) and oblique grain-shape/quartz c-axis-fabric method (0.72-0.98) implies that the D-1 and D-2 deformations formed a progressive process from early pure shear-dominated (D-1) to simple shear-dominated (D-2) shearing. Shear sense indicators from different parts (Units I and II) of the dome are compatible with top-to-the southeast shearing during D-2 deformation. It is shown that the D-1-D-2 deformation was characterized by a successive process from penetrative flow (D-1) and ductile shearing at middle to lower crustal levels to doming (D-2) that was coeval with exhumation of the DCS complex since 27 Ma or earlier. We conclude that these processes, i. e., the penetrative flow, ductile shearing, doming and exhumation of the DCS complex, were attributed to lateral subhorizontal middle to lower crustal flow along the ASRR metamorphic belt in the Southeastern Tibetan Plateau during the Indian and Eurasian plate collision.
机译：在藏西藏高原地壳中如何在过去的几十年里仍然对印度洋 - 欧亚大陆碰撞的回应流动。沿着地壳移动区的变质复合物，例如，沿着北山红河（ASRR）变质带的Diancang Shan（DCS）复合物可以提供关于我们在碰撞期间的中下地壳流动的理解的关键知识。在这种贡献中，DCS复合物的综合结构，微观结构，运动学和热长度研究表明，该复杂构成了破坏的A型圆顶。正常型果实的高级变质岩体形成肢体（单位）在肢体中的低级变质岩石覆盖的核心（单元I）（单位II）。 DCS圆顶的东部肢体由正常剪切区（单元III）切割。在复合物中识别新生代变形结构的三相（D-1，D-2和D-3）。 D-1和D-2结构构成单位I和II的主导结构风格。 D-1结构由穿透性S-1叶子，矿物素（L-1），对称的缺陷（F-1）和来自单元I和II的岩石中的花岗岩和石英静脉的构造透镜。 Mylonitic叶片（S-2 // S-1），NNW-SSE推入脱冰伸展基底eations（L-2），广泛的A型折叠（F-2），不对称卟啉平板和构造透镜在D中形成了主导结构款式-2变形。 D-3结构是普通滑动剪切区中的新叶子53和热条纹L-3（单元III）。 S-2 // S-1叶子定义DCS复合物的DOMA1框架，由D-3剪切区域截断。圆顶是NW-SE伸长的，并且具有与L-2 // L-1拉伸基氨酸的铰链线平行。结构和微观结构风格的合成分析，旋转刚性卟啉型法估计的运动涡流数据（0.38-0.69）和斜纹形状/石英C轴织物方法（0.72-0.98）意味着D-1和D- 2变形形成从早期纯剪切支配的（D-1）到简单的剪切结构（D-2）剪切的渐进过程。来自DOME的不同部件（单位I和II）的剪切感测指示器与D-2变形期间的顶到东南剪切兼容。结果表明，D-1-D-2变形的特征在于，通过在中间到下部的地壳水平的渗透流（D-1）和延展性剪切的连续方法，与挖掘的挖掘（D-2）的地壳水平DCS复杂以来27 MA或更早。我们得出结论，这些过程，我。即，DCS复合物的穿透性流动，延展性剪切，多明和挖掘，归因于印度和欧亚平板碰撞期间沿东南高原沿ASRR变质带的横向脱色中的地壳流动。

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