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首页> 外文期刊>Geodinamica Acta >Current-independent paleomagnetic declinations in flysch basins: a case study from the Inner Carpathians
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Current-independent paleomagnetic declinations in flysch basins: a case study from the Inner Carpathians

机译：蝇fly盆地中与电流无关的古磁偏角：以内喀尔巴阡山脉为例

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摘要

Paleomagnetic declinations from the Inner Carpathian Paleogene Basin imply that the area rotated counterclockwise about 60 degrees, during the Miocene[1]. The question may arise if the paleomagnetic declination could have been biased by the W-E directed turbidity currents prevailing in the basin causing an apparent counter-clockwise rotation of the paleomagnetic direction. The paleomagnetic results were obtained for fine grained strata, deposited in relatively calm water. Nevertheless, to confirm the paleomagnetic rotation, we needed evidence that flow activity on the magnetic grains was indeed insignificant in the beds yielding paleomagnetic results. Therefore, we carried out magnetic anisotropy measurements. Results of AMS (representing para and ferromagnetic minerals together) measurements, compared with paleomagnetic observations, demonstrate that well-clustered lineations at locality level and failure to define a paleomagnetic direction are coupled. Lineation, when observable, is flow parallel, suggesting that magnetic lineation in the Inner Carpathian flysch basins may be regarded as a good proxy for turbidity current direction. It is remarkable, however, that the well-defined paleomagnetic directions are observed for localities, where the magnetic fabric is not showing lineation on locality level. Moreover, the lineation direction of the ferromagnetic minerals alone (obtained by measuring the anisotropy of the remanence) is independent of that of the turbidity currents. Thus we can safely conclude that the Inner Carpathian flysch basin indeed was affected by 60 degrees tectonic rotation, and the paleomagnetic vectors were not biased by paleocurrents.
机译：内喀尔巴阡山脉古近纪盆地的古磁偏角表明，在中新世期间，该区域逆时针旋转了约60度。如果在盆地中普遍存在的W-E方向的浊流会导致古磁偏角偏向，导致古磁方向出现明显的逆时针旋转，那么就会出现问题。对于沉积在相对平静水中的细颗粒地层，获得了古磁结果。然而，要确认古磁旋转，我们需要证据表明在产生古磁结果的层中，磁性颗粒上的流动活动确实不明显。因此，我们进行了磁各向异性测量。与古磁观测结果相比，AMS（一起代表顺磁性和铁磁矿物）测量结果表明，局部水平的聚类线型与定义古磁性方向的失败是耦合的。当可观察到时，线是平行流动的，这表明内喀尔巴阡山脉的复理盆地中的磁线可以被认为是浊流方向的良好替代。然而，值得注意的是，对于局部观察到了明确定义的古磁方向，其中磁性织物未在局部水平上显示出线条。此外，单独的铁磁矿物的排列方向（通过测量剩磁的各向异性获得）与浊流无关。因此，我们可以安全地得出结论，内喀尔巴阡山脉的复理盆地确实受到了60度构造旋转的影响，并且古磁矢量没有受到古电流的偏置。

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