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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Cenozoic to Cretaceous paleomagnetic dataset from Egypt: New data, review and global analysis
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Cenozoic to Cretaceous paleomagnetic dataset from Egypt: New data, review and global analysis

机译：新生代到白垩纪古磁性数据集来自埃及：新数据，审查和全局分析

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Different phases of igneous activity took place in Egypt during the Mesozoic and the Cenozoic and oriented samples were collected from three Cenozoic localities (Baharya oasis in the Western Desert, Abu Had in the Eastern Desert and Quseir along the Red Sea coast), and four Cretaceous localities (Toshki & Abu Simbel south of Aswan, and Shalaten & Abu Shihat along the Red Sea coast). Rock magnetic properties of the samples indicate magnetite and titanomagnetite as the main carrier of the remanent magnetization. Following stepwise demagnetization, characteristic remanent directions were identified only for 62% of the samples, a fairly low rate for that type of samples, and 8 new paleomagnetic poles were calculated. All our Cenozoic poles fall clearly off Master Polar Wander Paths proposed for South Africa. Therefore, all paleomagnetic results, previously published for Egypt, were compiled from Cretaceous to Quaternary. The published poles largely overlap, blurring the Egyptian Apparent Polar Wander Path. A new analysis at the site level was then carried out. Only poles having a kappa larger than 50 were selected, and new pole positions were calculated by area and by epoch, when at least 3 sites were available. Even though the selection drastically reduced the number of considered poles, it allows definition of a reliable Cenozoic apparent polar wander trend for Egypt that differs from the South African Master Polar Wander Path by about 10-15 degrees. If the Cretaceous igneous poles are in good agreement with the rest of the African data, the sedimentary poles plot close to the Cenozoic portion of the South African Master Polar Wander Path, a discrepancy that could be related either to inclination flattening and/or error on age and/or remagnetization in the Cenozoic. (C) 2018 Elsevier B.V. All rights reserved.
机译：在埃及的不同阶段发生在埃及期间，在中生代，血卓和面向样品从三个新生代地方收集（西部沙漠中的Baharya Oasis，Abu在东部沙漠和红海海岸的Quesir）和四个白垩纪地区（阿斯旺南部的Toshki＆Abu Simbel，以及沿红海海岸的Shalaten＆Abu Shihat）。样品的岩石磁性特性表示磁铁矿和钛磁石作为搅拌磁化的主要载体。下面逐步退磁，特性剩磁方向只确定了样品的62％，相当低的速率为该类型的样品，和8个新的古地磁极进行了计算。我们所有的新生代杆都清楚地落下了为南非提出的北极漫游道路。因此，以前发表于埃及的所有古磁性结果从白垩纪编制到第四纪。公布的杆很大程度上重叠，模糊埃及明显的极地漂流道。然后进行网站级别的新分析。仅选择具有大于50大于50的杆的极，并且当可获得至少3个位点时，通过面积和时代计算新的杆位置。尽管选择大幅减少了考虑的极点的数量，但它允许对埃及的可靠新生代明显极性漂流趋势的定义，从南非掌握极性漫步路径约为10-15度。如果白垩纪的火焰杆与非洲数据的其余部分吻合良好，则沉积杆靠近南非硕士极地漫游路径的新生代部分，这种差异可能与倾斜平整和/或错误相关的差异新生代的年龄和/或重新凝结。 （c）2018年elestvier b.v.保留所有权利。

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