Morphotectonics and paleostress analyses of Kutch area, Gujarat, India

Results in Earth Sciences Pub Date : 2023-10-01 DOI:10.1016/j.rines.2023.100002

Mayur Shashikant Dhawale , Soumyajit Mukherjee , Mery Biswas

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Abstract

The Kutch Rift Basin (KRB) is of great attention for its possible hydrocarbon reserve. In this context, geomorphologic and structural geologic studies of the onland basin area are crucial. Application of geomorphic indicators viz., compactness coefficient (Cc), lemniscate coefficient (k), form ratio (Rf), basin shape index (Bs), basin asymmetry factor (AF), hypsometric integral (HI), elongation ratio (Re) and circularity ratio (Rc) have been utilized to calculate the Index of Active Tectonics (IAT) for a part of KRB. Watersheds 5 (the Bhuj area), 9, 10, 11, 17, 18 and 20 belong to class 1 as per the IAT. This indicates that these watersheds are very highly tectonically active at present. Calculated valley floor width height ratio (V_f) and mountain front sinuosity (Smf) quantify the active valley incision in the Quaternary that uplifted the Bhuj area. This uplift was accompanied by a high-degree of drainage rejuvenation due to neotectonics and formation of a canyon in the Khari river. Paleostress analyses revealed NNE and NW-oriented extensions around Bhuj that can correspond to NW and NNE-trending normal fault planes, respectively.

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印度古吉拉特邦库奇地区的形态构造和古应力分析

库奇裂谷盆地（KRB）因其可能的油气储量而备受关注。在这种背景下，对上陆盆地地区的地貌和结构地质研究至关重要。应用地貌指标，即压实度系数（Cc）、双纽线系数（k）、形状比（Rf）、盆地形状指数（Bs）、盆地不对称系数（AF）、高度积分（HI）、延伸率（Re）和圆度比（Rc），计算了KRB一部分的活动构造指数（IAT）。根据IAT，流域5（Bhuj地区）、9、10、11、17、18和20属于1类。这表明这些流域目前的构造活动非常活跃。计算出的谷底宽高比（Vf）和山前弯度（Smf）量化了第四纪活跃的山谷切口，使布吉地区隆起。由于新构造作用和卡里河峡谷的形成，这种隆起伴随着高度的排水复兴。古应力分析揭示了Bhuj周围NNE和NW方向的延伸，分别对应于NW和NNE方向的正断层面。

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Results in Earth Sciences

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