首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Identification of probable faults in the vicinity of Harnai-Ratnagiri region of the Konkan coast, Maharashtra, India
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Identification of probable faults in the vicinity of Harnai-Ratnagiri region of the Konkan coast, Maharashtra, India

机译:识别印度马哈拉施特拉邦康坎海岸Harnai-Ratnagiri地区附近的可能断层

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The Konkan coastline from Harnai to Guhagar consists of many straight line segments being arranged in an en-echelon manner. The false color composite (FCC) reveals the coincidence of these segments with NW-SE trending lineaments that conspicuously cut across the Deccan Basalt Province adjoining the seacoast. Furthermore, another less prominent lineament set has been noticed in ENE-WSW direction offsetting the former. These lineaments are occupied by major rivers which originate from the Western Ghats escarpment and flow westerly into the Arabian Sea. Trellis and barbed type of drainage pattern are observed due to strong influence of these sets of lineaments. One of the NNW-SSE lineaments extending from Harnai to Kajurli has been studied, which reveals the presence of narrow and straight course of river flowing along it. While the western bank of the river is steep with a number of waterfalls, the eastern side carries flat terraces. The riverbed exposes highly fractured basalt criss-crossed by NNW-SSE and ENE-WSW sets of fractures. The NNW-SSE set which is sympathetic to the main lineament, hosts quartz veins that show pinch-and-swell and boudinage structure. The boudins are sigmoidal and are arranged in en-echelon pattern indicating shear origin. Hence it is believed that the NNW-SSE lineaments are probable faults in the area. Rare slickensides are observed on the quartz vein wall, which are mostly subvertical, suggesting a dip slip nature of faulting. The faulting is post-Deccan Basalt and could be Quaternary in age. [References: 26]
机译:从Harnai到Guhagar的Konkan海岸线由沿直线排列的许多直线段组成。假彩色复合材料(FCC)揭示了这些分段与NW-SE趋势线的重合,这些趋势线明显地横穿了毗邻海岸的Deccan玄武岩省。此外,在ENE-WSW方向上发现了另一个不太突出的线条集,抵消了前者。这些谱系被主要的河流所占据,这些主要河流源于西高止山脉悬崖,并向西流入阿拉伯海。由于这些套系的强烈影响,可以观察到网格和倒刺型的排水模式。已经研究了从哈奈到卡久里的NNW-SSE谱系之一,它揭示了沿其流动的河道狭窄而笔直。虽然河的西岸陡峭,有许多瀑布,但东侧却有平坦的梯田。河床暴露出高度断裂的玄武岩,其间交叉着NNW-SSE和ENE-WSW裂缝。 NNW-SSE装置与主谱相吻合,拥有石英静脉,显示出夹捏和膨出以及肉瘤的结构。布丁为S形,以梯形图案排列,表示剪切起点。因此,可以认为NNW-SSE构造可能是该地区的断层。在石英脉壁上观察到稀有的光滑滑石,这些滑石多为亚垂直的,表明断层具有倾滑特征。断层是德肯玄武岩时代后的,年龄可能是第四纪。 [参考:26]

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