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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Fluid genesis through serpentinites and the origin of subsurface electrical conductors in Northwest India and adjoining regions
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Fluid genesis through serpentinites and the origin of subsurface electrical conductors in Northwest India and adjoining regions

机译：蛇纹岩的流体成因及印度西北部及邻近地区地下导体的起源

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Large-scale conductivity anomalies have been detected and subsequently modelled/inverted based on the data of geomagnetic deep sounding in Northwest India by various researchers. In this study, by analytical dissection of several other geophysical parameters, in conjunction with the constrained modelling of electrical parameters of the conductors, we believe that we have resolved the origin of three Northwest Indian conductors. This issue had remained, so far, either speculative or an explanation was given without taking due analytical support from other geophysical data. Moreover, a unique relationship has been found and the same advocated amongst the high values of Poisson's ratio and the electrical parameters of conductors. These high values of Poisson's ratio conform to the presence of serpentinites in the region at appropriate depths. Under the present geotectonic setting, the upward migration of serpentine from mantle to subcrustal level and its consequent dehydration leading to fluid genesis seems to be the appropriate cause for the conductivity anomalies in the Northwest Indian region, including Lesser Himalaya, however, the exact mechanism for upward migration (a fact established elsewhere) may, at present, remain tentative. Some indirect inferences have been drawn through a hypothesized model (cartoon) to shed light on the possible mode of fluid transport resulting in conductivity anomalies of the region. The presence of fluids has also been cited in literature in Higher Himalayan regions, resulting due to under-thrusting of the Indian basement. Elsewhere in the Northwest Himalayan region, the presence of serpentinite in close association of eclogite has been found. These serpentinites are formed by hydration of the mantle wedge resulting due to de-watering of the subducted slab. These facts strengthen the belief of the continuation of fluid body in Himalayan and adjacent Northwest region in the crust.
机译：各种研究人员已经检测到大规模电导率异常，随后根据印度西北部的地磁深测数据对它们进行了建模/反演。在这项研究中，通过对其他几个地球物理参数的分析剖析以及导体电参数的受限建模，我们相信我们已经解决了西北印度三种导体的起源。到目前为止，这个问题仍然存在，只是在没有得到其他地球物理数据适当分析支持的情况下给出了推测或解释。此外，在泊松比的高值和导体的电参数之间发现了一种独特的关系，并提倡相同的关系。泊松比的这些高值与在适当深度的区域中蛇纹岩的存在相符。在目前的大地构造背景下，蛇纹石从地幔向上迁移到地壳下水平，进而导致流体成因的脱水，似乎是西北印度地区（包括小喜马拉雅山）电导率异常的适当原因，然而，向上迁移（在其他地方已确定的事实）目前可能仍是暂时的。通过假设模型（卡通）得出了一些间接推论，以阐明可能导致区域导电率异常的流体传输方式。喜马拉雅山较高地区的文献中也提到了流体的存在，这是由于印度地下室的推力不足造成的。在西北喜马拉雅地区的其他地方，发现蛇纹岩的存在与榴辉岩密切相关。这些蛇纹岩是由于俯冲板块脱水而形成的地幔楔水合而形成的。这些事实增强了人们对地壳中喜马拉雅及邻近西北地区流体继续存在的信念。

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