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首页> 外文期刊>Journal of Asian earth sciences >Possible detachment zone in Precambrian rocks of Kanjamalai Hills, Cauvery Suture Zone, Southern India: Implications to accretionary tectonics
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Possible detachment zone in Precambrian rocks of Kanjamalai Hills, Cauvery Suture Zone, Southern India: Implications to accretionary tectonics

机译：印度南部Cauvery缝合带Kanjamalai Hills的前寒武纪岩石中可能的脱离带：对增生构造的影响

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摘要

Existence of a possible detachment zone at Elampillai region, NW margin of Kanjamalai Hills, located in the northern part of Cauvery Suture Zone (CSZ), Southern India, is reported here for the first time. Detailed structural mapping provides anatomy of the zone, which are rarely preserved in Precambrian high grade terranes. The detachment surface separates two distinct rock units of contrasting lithological and structural characters: the upper and lower units. The detachment zone is characterized by a variety of fold styles with the predominance of tight isoclinal folds with varied plunge directions, limb rotations and the hinge line variations often leading to lift-off fold like geometries and deformed sheath folds. Presence of parasitic folding and associated penetrative strains seem to be controlled by differences in mechanical stratigraphy, relative thicknesses of the competent and incompetent units, and the structural relief of the underlying basement. Our present study in conjunction with other available geological, geochemical and geochronological data from the region indicates that the structures of the detachment zone are genetically related to thrust tectonics forming a part of subduction-accretion-collision tectonic history of the Neoproterozoic Gondwana suture.
机译：首次报道了位于印度南部Cauvery缝合带（CSZ）北部的Kanjamalai Hills西北边缘Elampillai地区的一个可能的脱离带。详细的结构映射提供了该区域的解剖结构，在前寒武纪高级地层中很少保留该区域。分离面将两个具有不同岩性和结构特征的岩石单元分开：上部和下部。分离区的特点是具有多种折叠样式，其中主要是紧密的等腰线折叠，其俯冲方向，肢体旋转和铰链线变化通常会导致抬起式折叠，例如几何形状和变形的鞘式折叠。寄生褶皱和相关渗透应变的存在似乎受机械地层学差异，主管和无主管单位的相对厚度以及下层地下室的结构起伏作用的控制。我们目前的研究与该地区其他可用的地质，地球化学和地质年代数据相结合，表明脱离区的结构与逆冲构造具有遗传相关性，构成了新元古代冈瓦纳缝合线俯冲-增生-碰撞构造历史的一部分。

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