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首页> 外文期刊>Geophysical Research Letters >Electromagnetic imaging of a transpressional tectonics in SW Iberia
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Electromagnetic imaging of a transpressional tectonics in SW Iberia

机译：伊比利亚西南部超压构造的电磁成像

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Forty-one magnetotelluric soundings are carried out along a 200 kin-long profile (approximately NNE-SSW) across the three major geotectonic units in SW Iberia. A model obtained from two-dimensional inversion of the magnetotelluric data set reveals high conductivity zones in the middle-lower crust (10-30 km). TWO Of these zones correspond to the transition between the main geotectonic units: one between the South Portuguese Zone and the Ossa Morena Zone, interpreted as having been caused by metasediments, and the other between the Ossa Morena Zone and the Central Iberia Zone associated with a shear zone and metasediments. Another high conductivity anomaly related to black shales with major graphite impregnation was detected within thr: Ossa Morena Zone. The resistive features, located preferentially in the upper crust (1-10 km), coincide with gabbroic and granitic complexes. [References: 23]
机译：沿西南伊比利亚的三个主要大地构造单元沿200 kin长剖面（约NNE-SSW）进行了41个大地电磁测深。从大地电磁数据集的二维反演获得的模型揭示了中下地壳（10-30 km）中的高电导率区域。这些区域中的两个对应于主要大地构造单元之间的过渡：一个在南葡萄牙区域与奥萨·莫雷纳地区之间，被解释为是由沉积物引起的，另一个在奥萨·莫雷纳地区与伊比利亚中部地区之间的过渡，剪切带和变质沉积物。在thr处发现了另一个与黑色页岩伴有大量石墨浸渍有关的高电导率异常：Ossa Morena区。电阻特征优先位于上地壳（1-10 km），与辉长岩和花岗质复合体一致。 [参考：23]

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