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首页> 外文期刊>Earth, planets and space: EPS >Granitic and magmatic bodies in the deep crust of the Son Narmada Region, Central India: Constraints from seismic, gravity and magnetotelluric methods
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Granitic and magmatic bodies in the deep crust of the Son Narmada Region, Central India: Constraints from seismic, gravity and magnetotelluric methods

机译：印度中部Son Narmada地区深地壳中的花岗岩和岩浆体：地震，重力和大地电磁方法的约束

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摘要

Magnetotelluric (MT) data at 24 locations in the Son Narmada region, Central India,were collected across the Tapti North Fault and Son Narmada Fault along the Chinchpada-Godhra profile (220 km). MT impedance tensors were then estimated in the period range 0.001-1,000 s using robust processing codes. The N70 E geo-electric strike direction was obtained by multi-site, multi-frequency analysis. The data were modeled using non-linear conjugate gradient scheme taking both apparent resistivity and phase into account. The two-dimensional MT model obtained (after static shift correction) represents resistive bodies (1,000-3,000 ohm-m) and conductive bodies (<20 ohm-m) in the deep crust. The resistive bodies in the lower crust are interpreted to be granitic intrusive complexes. The conductor on the south of Son Narmada Fault is attributed to the presence of magmatic bodies due to underplating, and the conductor on the north as due to the presence of fluids. The highly resistive (>2,000 ohm-m) upper crust is interpreted to comprise felsic rocks of granitic composition, and the low-resistive (<100 ohm-m) deep crust as being composed of dense mafic granulites. The Domal upwarp structure near Son Narmada Fault, with a thick felsic crust sandwiched between the mafic and intermediate crust, can be explained by underplated sediments/felsic crust which jacked-up the lithounits above.
机译：在印度中部Son Narmada地区的24个地点沿Chinchpada-Godhra剖面（220 km）跨Tapti North断层和Son Narmada断层收集了大地电磁（MT）数据。然后使用稳健的处理代码在0.001-1,000 s的周期范围内估计MT阻抗张量。通过多站点，多频率分析获得了N70 E地电走向。使用非线性共轭梯度方案对数据进行建模，同时考虑视电阻率和相位。获得的二维MT模型（经过静态位移校正后）表示深壳中的电阻体（1,000-3,000 ohm-m）和导电体（<20 ohm-m）。下地壳中的电阻体被解释为花岗岩侵入复合体。 Son Narmada断层南侧的导体归因于底盘层的存在，岩浆体的存在，而北侧的导体则归因于流体的存在。高电阻（> 2,000 ohm-m）的上地壳被解释为由花岗岩组成的长英质岩石组成，而低电阻（<100 ohm-m）的深壳由致密的镁铁质花岗石组成。 Son Narmada断层附近的Domal向上翘曲结构，夹在镁铁质和中间地壳之间的是厚厚的长英质地壳，这可以用顶板沉积物/长英质地壳来解释，这些沉积物/长相地壳顶起了上岩石单元。

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