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首页> 外文期刊>Journal of South American earth sciences >Anomalous electrical structure in the northwestern Parana Basin, Brazil, observed with broadband magnetotellurics
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Anomalous electrical structure in the northwestern Parana Basin, Brazil, observed with broadband magnetotellurics

机译：利用宽带大地电磁观测到的巴西西北部巴拉那盆地的异常电子结构

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摘要

The deep structure of the northern part of the Parana Basin has been investigated through the analysis of a SW-NE magnetotelluric (MT) profile composed of 24 broadband stations with periods from 0.001 to ～ 1000 s that are regularly spaced ～ 10 km apart. The SW portion of the profile crosses a negative Bouguer anomaly with amplitudes of ～20 mGal. Our analyses show that there are two lithospheric domains with different gravity and electric conductivity properties. In the regularized two-dimensional MT inversion model the mid-to-lower crust in the SW part of the profile is almost two orders in magnitude more conductive compared to the NE portion. This difference in conductivity extends to the uppermost mantle depths, suggesting the existence of a major lithospheric discontinuity in the north-central Parana Basin, locally coincident with the position of the Apore River. We interpret this discontinuity as a juxtaposition of terranes with distinct natures and ages, possibly as result of tectonic accretion during the formation of Western Gondwana.
机译：通过对SW-NE大地电磁（MT）剖面的分析，对巴拉那盆地北部的深部结构进行了研究，该剖面由24个宽带站组成，周期为0.001至〜1000 s，间隔为〜10 km。剖面的西南部分穿过负的布格异常，幅度为〜20 mGal。我们的分析表明，存在两个岩石圈域，具有不同的重力和电导率特性。在正则化二维MT反演模型中，剖面的SW部分中下部地壳的导电性比NE部分高了近两个数量级。电导率的这种差异延伸到最上层的地幔深度，这表明巴拉那盆地中北部存在主要的岩石圈间断，与阿波罗河的位置在局部重合。我们将此不连续性解释为具有不同性质和年龄的地层的并置，可能是由于西部冈瓦纳形成过程中构造增生的结果。

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