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首页> 外文期刊>Earth, planets and space: EPS >A new Late Permian paleomagnetic pole for stable South America: The Independencia group, eastern Paraguay
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A new Late Permian paleomagnetic pole for stable South America: The Independencia group, eastern Paraguay

机译：稳定南美的新二叠纪古磁极：巴拉圭东部的Independencia组

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摘要

The Late Permian segment of the South American apparent polar wander path (APWP) is poorly defined and further paleomagnetic efforts on suitable rocks of such age from stable areas of South America are needed. A study was carried out on the Late Permian Independencia Group, which is discontinuously exposed along Eastern Paraguay and consists of several hundred meters of flat lying continental white, pink and reddish sandstones and siltstones, deposited on the western margin of the Parana basin. Thirteen sites (83 samples) were collected on the top unit of the Group (the latest Permian Tacuary Fm) from outcrops distributed over 1000 square kms. Detailed AF and thermal demagnetization permitted the isolation of within-site consistent characteristic remanence in eleven sites, being generally hematite the main carrier of the remanence. Excluding one outlier, a paleomagnetic pole was computed by averaging 10 virtual geomagnetic poles of mixed polarities (6 reversed, 4 normal), yielding a position at: 80.7 degrees S, 7.0 degrees E, A95: 6.6 degrees. The new pole may be considered key for a better definition of the South American APWP by filling a gap between a relatively reliable Early Permian and a poorly defined Early-Middle Triassic groups of poles.
机译：南美表观极地漫游路径（APWP）的晚二叠世段定义不清，需要在南美稳定地区对这种年龄的合适岩石进行进一步的古磁研究。对二叠纪晚期独立组进行了研究，该组不连续地沿巴拉圭东部暴露，由沉积在巴拉那盆地西缘的几百米平坦的大陆性白色，粉红色和带红色砂岩和粉砂岩组成。从分布在1000平方公里的露头上，在该小组的最高单位（最新的二叠纪牛场Fm）上收集了13个地点（83个样本）。详细的AF和热消磁可以隔离11个部位的内部一致的特征剩磁，通常是赤铁矿剩磁的主要载体。除一个异常值外，通过平均10个混合极性的虚拟地磁极（6个反向，4个法线）来计算古地磁极，其位置为：南纬80.7度，东经7.0度，A95度：6.6度。通过填补相对可靠的早二叠纪和极少定义的早中三叠世两极组之间的差距，可以将新极认为是对南美APWP进行更好定义的关键。

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