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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Regional conductance map of Saurashtra and surrounding regions
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Regional conductance map of Saurashtra and surrounding regions

机译：索拉什特拉及周边地区的区域电导图

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摘要

Magnetovariational fields recorded by an array of magnetometers in Saurashtra and the surrounding regions have been analysed to infer the electrical conductivity distribution of the region. Only night-time magnetovariational fields were used because of the prevailing uniform source field conditions. Induction arrows (showing the relationship between vertical and horizontal magnetic field variations) are pointing towards Saurashtra and Kutch offshore basins.Thin-sheet modelling of the observed induction arrows suggest the presence of two prominent conductivity anomalies. The first elongated anomaly coincides with the horst and graben offshore structures of Saurashtra and Kutch. The second anomaly is over the Saurashtra depression and correlates well with the low-magnetization anomaly that extends in the NE-SW direction towards Cambay basin. The possible cause for the above anomalies may be fluids originated by underplating mantle material related to hotspot activity and rift phase volcanism. Large-scale upwelling, partial melts or thermal remo-bilization of crustal and mantle material during the processes of rifting and hotspot activity may enhance crustal/upper mantle conductivity, which explains the accentuation of the induction arrows observed in Saurashtra region.
机译：通过分析Saurashtra和周围地区的一系列磁力计记录的磁变场，以推断该地区的电导率分布。由于普遍存在统一的源场条件，因此仅使用夜间磁变场。感应箭头（显示垂直和水平磁场变化之间的关系）指向索拉什特拉和库奇近海盆地。观察到的感应箭头的薄板模型表明存在两个明显的电导率异常。第一个拉长的异常现象与索拉什特拉和库奇（Saurashtra）和库奇（Kutch）的近海构造和grab陷相吻合。第二个异常是在索拉什特拉凹陷上空，并且与沿NE-SW方向向坎贝盆地延伸的低磁化异常密切相关。上述异常的可能原因可能是由与热点活动和裂谷期火山作用有关的地幔物质下沉引起的流体。在裂谷和热点活动过程中，地壳和地幔物质的大规模上涌，部分熔融或热移动化可能会增强地壳/上地幔的电导率，这解释了在索拉什特拉地区观察到的感应箭头的加重。

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