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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Structural intricacies: Emergent thrusts and blind thrusts of Central Kachchh, western India
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Structural intricacies: Emergent thrusts and blind thrusts of Central Kachchh, western India

机译：结构上的复杂性：印度西部卡切赫地区的突发逆冲和盲冲

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The Kachchh peninsula is an example of active 'fold-and-thrust' tectonism. In Central Kachchh there are four conspicuous major E-W-oriented hill ranges characterized by fault-propagation folds with steeply dipping northern limbs and gently dipping southern limbs.The region constitutes a Mesozoic basin located in the western margin of India and has recorded nearly an unbroken sequence of Mesozoic and Cainozoic formations. Rocks older than the Jurassic period are not exposed in Kachchh. By and large the sedimentary rocks are gently dipping, often dissected. by faults. Lowangle reverse faults are encountered together with asymmetric folds at several places along the linear hill ranges. The forefronts of hill ranges represent fault-line scarps, i.e. eroded hanging wall or hinge of fault-propagation folds. Traces of steeply dipping eroded northern limbs are discernible at a few places, while gently dipping to sub-horizontal southern limbs of regional folds are obvious in the Kachchh Mainland as well as in the northern islands. While the Katrol Hill Fault has evolved into an 'emergent thrust', in the Kachchh Mainland Hill range the tip of the fault is yet to emerge out and it has remind a 'blind thrust'.From the gradual increasing dimension of the linear chain of hillocks towards the west along the Kachchh Mainland Fault and the epicentre of the earthquake of 2001 lying at the eastern extreme of Kachchh Mainland Fault, it is suggested that the eastern part of the Kachchh Mainland Fault is progressively emerging upward. It can be suggested from the absence of distinct surface rupture both during the 1956 Anjar earthquake and 2001 Bhuj earthquake, that movements have taken place along a blind thrust. The series of villages situated on the 'blind thrust' in the eastern part of the Kachchh Mainland Hill Range (viz. Jawaharnagar, Khirsara, Devisar, Amarsar and Bandhdi) was completely erased.
机译：卡奇（Kachchh）半岛是活跃的“褶皱推覆”构造的一个例子。在卡奇中部地区，有四个明显的以EW为导向的主要山脉，其特征是断层传播褶皱，北肢陡峭地倾斜，而南肢则缓缓地倾斜。该区域构成了位于印度西部边缘的中生代盆地，记录了近乎完整的序列中生代和新生代构造。在侏儒时代，比侏罗纪时期古老的岩石没有被暴露出来。总的来说，沉积岩是缓慢浸入的，通常会被解剖。过错。沿着线性山岭范围的多个位置都遇到了低角度反向断裂和不对称褶皱。山脉的最前沿代表断层线陡坡，即侵蚀的悬挂壁或断层传播褶皱的铰链。在一些地方可以看到陡峭浸蚀的北肢痕迹，而在Kachchh大陆和北部岛屿上则明显浸入到区域褶皱的亚水平的南肢中。尽管Katrol Hill断层已演变为``紧急冲断层''，但在Kachchh大陆山范围内，该断层的尖端尚未出现，并提醒了``盲冲层''。 Kachchh大陆断层的西部有小丘，而2001年地震的震中位于Kachchh大陆断层的东部，这表明Kachchh大陆断层的东部正在逐渐向上发展。从1956年的安贾尔地震和2001年的布杰地震中都没有明显的表面破裂可以看出，运动是沿盲推力发生的。位于Kachchh大陆山脉东部（即Jawaharnagar，Khirsara，Devisar，Amarsar和Bandhdi）东部“盲目推力”上的一系列村庄被彻底清除。

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