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首页> 外文期刊>Journal of Asian earth sciences >Structural Fabric Of The Southern Indian Shield As Defined By Gravity Trends
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Structural Fabric Of The Southern Indian Shield As Defined By Gravity Trends

机译：重力趋势确定的南印度盾构的结构性织物

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摘要

Southern Indian shield represents a mosaic comprised of several smaller structural domains separated by discrete shear zones. Here we present a horizontal Bouguer gravity gradient map of the Indian shield, south of 14 °N, to define a continental mosaic of gravity trends domains akin to structural domains. The gravity gradient image is based on 7862 newly collected observations merged with 6359 old gravity data. This combined dataset delineates structural boundaries of the five gravity domains related to the Eastern Dharwar Craton, the Eastern Ghats Mobile Belt, the extended Eastern Ghats Mobile Belt, the Southern Granulite Terrain, and the Western Dharwar Craton. Other belts of significant gravity gradients are found associated with the Eastern and the Western coasts. The loci of Closepet granite and Kolar schist belts do not manifest themselves as boundary zones between two distinct gravity domains of the Eastern Dharwar Craton. Lack of a gravity gradient across Karur-Oddanchatram-Kodaikanal and Kar-ur-Kambam-Painavu-Trichur Shear Zones may be attributed to a lack of gravity measurements caused by difficulties in collecting data in topographically difficult terrain. The subdued gravity gradient across the Palghat-Cauvery Shear Zone and a weak gradient across the Achankovil Shear Zone indicates a lith-ological and/or morphological boundary rather than a terrane boundary. Alternatively, structural domains encompassing Palghat-Cauvery and Achankovil Shear Zones may have been in a neighbouring position during the Gondwana assembly, when Pan-African thermal perturbation reactivated the structures and reworked partly or totally obliterating earlier crustal fabric.
机译：印度南部盾构代表由几个较小的结构域组成的镶嵌图，这些结构域由离散的剪切带隔开。在这里，我们展示了印度盾构在14°N以南的水平布格重力梯度图，以定义类似于结构域的重力趋势域的大陆镶嵌图。重力梯度图像基于7862个新收集的观测值与6359个旧重力数据合并而成。该组合数据集描绘了与东部Dharwar Craton，East Ghats移动带，扩展的Eastern Ghats移动带，Southern Granulite地形和Western Dharwar Craton有关的五个重力域的结构边界。发现其他明显的重力梯度带与东部和西部海岸有关。 Closepet花岗岩和Kolar片岩带的位点并未显示为东部Dharwar Craton的两个不同重力域之间的边界区域。跨Karur-Oddanchatram-Kodaikanal和Kar-ur-Kambam-Painavu-Trichur剪切带的重力梯度不足可能是由于在地形困难的地形中收集数据困难而导致的重力测量不足。横跨Palghat-Cauvery剪切带的重力梯度柔和和横跨Achankovil剪切带的弱梯度表明岩性和/或形态学边界，而不是地层边界。或者，当泛非热扰动使结构重新活化，并部分或完全消除较早的地壳织物时，在冈瓦纳组装期间，包含Palghat-Cauvery和Achankovil剪切带的结构域可能处于相邻位置。

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