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Trap thickness and the subtrappean structures related to mode of eruption in the Deccan Plateau of India: results from magnetotellurics

机译：印度德干高原的圈闭厚度和与火山爆发模式有关的亚圈层结构：来自大地电磁学的结果

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Deccan trap thickness is an important parameter in understanding the eruption process of flood basalts (65 My). A magnetotelluric study was carried out in Deccan Volcanic Province (DVP) of the Indian Peninsular shield during 1998-1999. Modeling results clearly revealed variations both in the thickness of the Deccan traps and in their resistivity from the west coast to the eastern boundary of DVP. The thickness of the traps in DVP decreases from about 1.8 km in the west to a few hundred meters (approx. 400 m) towards the east. The traps also exhibit considerable variation in resistivity, with higher resistivities (approx. 150-200 ohm-m) in the western half and lower resistivities (approx. 50-100 ohm-m) in the eastern half of DVP. Two significant fissure/fracture zones have been detected in DVP; these may have acted as conduits for the outpouring of Deccan lavas in addition to the primary structures along the west coast and the Narmada-Son lineament (NSL) zones.
机译：Deccan圈闭厚度是了解洪水玄武岩喷发过程的重要参数（65 My）。 1998年至1999年期间，在印度半岛盾构的德肯火山省（DVP）进行了大地电磁研究。建模结果清楚地揭示了Deccan圈闭的厚度及其从DVP西海岸到东边界的电阻率的变化。 DVP中的陷阱厚度从西部的约1.8 km减小到东部的几百米（约400 m）。阱的电阻率也有很大变化，DVP的西半部电阻率较高（约150-200 ohm-m），DVP的东半部电阻率较低（约50-100 ohm-m）。在DVP中已检测到两个明显的裂缝/断裂带。除了沿西海岸和纳尔默达-桑德线（NSL）带的主要构造外，这些可能还充当了德干熔岩流泻的渠道。

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