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首页> 外文期刊>Journal of Asian earth sciences >Multiple thrust systems from the Southern Granulite Terrane, India: Insights on Precambrian convergent margin tectonics
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Multiple thrust systems from the Southern Granulite Terrane, India: Insights on Precambrian convergent margin tectonics

机译：来自印度南部肉芽石地区的多个推力系统：关于Preambrian收敛保证金构造的见解

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摘要

The geological and structural complexities of the Southern Granulite Terrane (SGT) of India, a key Gondwana collisional orogenic belt, are increasingly recognized and our understanding is still evolving despite several multidisciplinary efforts. Six important structural cross sections along some critical geological corridors have been reconstructed covering the entire stretch of SGT. We propose subduction related multiple thrust systems for the evolution of the SGT, based on the salient features derived from the structural cross sections and the currently available geoscientific data sets. The presence of tectonic windows and klippe structures in Madurai block and unusual occurrence of high strain zones on top of some of the highly elevated quartzite hills support the thrustnappe tectonic model for the SGT implying possible allochthonous nature of many of the supracrustals and granulitic units involving multiphases of thrusting. The evolution of the SGT involves converging accretionary processes of island arc magmatic intrusives, thrust stacking, crustal coupling, granitic emplacement and the obduction of ophiolite complexes indicating a complete range of geological processes encountered in modern orogenic belts. These features could thus be representative of multiple thrusting related to south directed subduction processes followed by wide scale collision of Gondwana fragments during the end Precambrian.
机译：印度南部粒状地区（SGT）的地质和结构复杂性，越来越认识到了巨大的巩膜碰撞带，仍然被认可，尽管有几个多学科努力，我们的理解仍在发展。沿着某些关键地质走廊的六个重要的结构横截面已经重建，覆盖整个SGT。我们提出俯冲相关的多次推力系统，用于基于从结构横截面和当前可用的地球科学数据集的突出特征和当前可用的地球科学集的演变。在Maduai块中的构造窗口和klippe结构的存在以及一些高度升高的石英岩山顶上的高应变区的不寻常出现支持SGT的推动力构造模型，这暗示了许多涉及多场的Supractals和粒度单位的表征性质推动。 SGT的演变涉及聚集岛弧岩岩侵入物的增生过程，推力堆叠，地壳耦合，花岗岩施加和Ophiolite络合物的露起，表明现代造山带中遇到的全系列地质过程。因此，这些特征可以代表与南方定向的俯冲过程相关的多重推进，然后在终端前锋期间宽阔的碎片碎片突然碰撞。

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