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首页> 外文期刊>Geochemistry, geophysics, geosystems >A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea
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A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea

机译：Gondwana明显极性漂流路径的纯偶极分析：Pangea演化中的古地理影响

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The paleogeography of prebreakup Pangea at the beginning of the Atlantic Spreading has been a subject of debate for the past 50 years. Reconciling this debate involves theoretical corrections that cast doubt on available data and paleomagnetism as an effective tool for performing paleoreconstructions. This 50 year old debate focuses specifically on magnetic remanence and its ability to correctly record the inclination of the paleomagnetic field. In this paper, a selection of paleopoles was made to find the great circles containing the paleomagnetic pole and the respective sampling site. The true dipole pole (TDP) was then calculated by intersecting these great circles, effectively avoiding nondipolar contributions and inclination shallowing, in an innovative method. The great circle distance between each of these TDPs and the paleomagnetic means show the accuracy of paleomagnetic determinations in the context of a dominantly geocentric, axial, and dipolar geomagnetic field. The TDPs calculated allowed a bootstrap analysis to be performed to further consider the flattening factor that should be applied to the sedimentary-derived paleopoles. It is argued that the application of a single theoretical correction factor for clastic sedimentary-derived records could lead to a bias in the paleolatitude calculation and therefore to incorrect paleogeographic reconstructions. The unbiased APWP makes it necessary to slide Laurentia to the west in relation to Gondwana in a B-type Pangea during the Upper Carboniferous, later evolving, during the Early Permian, to reach the final A-type Pangea configuration of the Upper Permian.
机译：在大西洋传播开始时，Pangea的古地理观察是过去50年的辩论主题。调和这场辩论涉及理论更正，将可用数据和古元磁性赋予的理论更正，作为表演古氏体结构的有效工具。这个50岁的争论专注于磁入漏，能够正确记录古磁场倾向的能力。在本文中，制作了各种古聚占古聚磁场，含有古磁杆和各自采样部位。然后通过与这些巨大的圆圈相交，有效地避免了创新方法，通过与这些巨大的圆圈交叉来计算真正的偶极杆（TDP）。这些TDP中的每一个与古磁性手段之间的巨大圆距显示在主要的地理，轴向和双极地质磁场的背景下古磁性测定的准确性。计算的TDP允许执行自举分析，以进一步考虑应该应用于沉积古聚级聚合的扁平性因子。有人认为，用于碎屑沉积记录的单一理论校正因子的应用可能导致柏波中的偏差，因此对古地理重建不正确。无偏见的APWP使得在上层石油中的B型Pangea中的Gondwana，在初始化的初期的术后，有必要将Laurentia滑动到西方，以达到上二叠纪的最终A型Pangea配置。

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    Gallo L. C.; Tomezzoli R. N.; Cristallini E. O.;

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    Univ Buenos Aires Inst Geociencias Basicas Aplicadas &

    Ambientales Lab Paleomagnetismo Daniel A Valencio CONICET Fac Ciencias Exactas &

    Nat Dept Ciencias Geol Buenos Aires DF Argentina;

    Univ Buenos Aires Inst Geociencias Basicas Aplicadas &

    Ambientales Lab Paleomagnetismo Daniel A Valencio CONICET Fac Ciencias Exactas &

    Nat Dept Ciencias Geol Buenos Aires DF Argentina;

    Univ Buenos Aires Inst Estudios Andinos Don Pablo Groeber Fac Ciencias Exactas &

    Nat Dept Ciencias Geol Lab Tecton Andina CONICET Buenos Aires DF Argentina;

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  • 正文语种 eng
  • 中图分类 地球物理学;
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