Testing Iberian kinematics at Jurassic‐Cretaceous times
Testing Iberian kinematics at Jurassic‐Cretaceous times
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侏罗纪-白垩纪伊比利亚运动学测试
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Eric Font
中科院分区：
文献类型：
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作者：
Marta Neres;J. Miranda;Eric Font
伊比利亚半岛中生代的古地理重建仍然是一个有争议的问题。运动学模型与 120Ma 以上的古地磁数据之间的不兼容是一个尚未确定原因的主要问题。在这里，我们使用一种新方法来调查这种不适应的根源。我们解决了寻找与全球视极地漂移路径（GAPWP）相匹配的欧拉极点的逆问题，然后测试它们对伊比利亚重建的影响。我们发现早白垩世的伊比利亚极点（123 Ma 和 130 Ma 的平均极点）与 GAPWP 不相容，从而使其有效性受到质疑。相反，晚侏罗世数据（平均极点为 151Ma）与 GAPWP 一致，因此可以认为是可靠的。基于这些结果，我们提出了伊比利亚和周围板块在~150Ma（M22异常）的新磁力重建。这项工作为侏罗纪-白垩纪伊比利亚的运动演化提供了新的约束。然而，伊比利亚运动演化的详细且一致的模型的开发取决于新的高质量古地磁数据的获取和对海底磁异常的重新评估。
Paleogeographic reconstructions of Iberia at the Mesozoic are still a matter of debate. The incompatibility between kinematic models and paleomagnetic data older than 120 Ma is a major problem for which no cause has yet been determined. Here we use a new method to investigate the origin of this misfit. We solve the inverse problem of finding the Euler poles that fit paleomagnetic poles with the Global Apparent Polar Wander Path (GAPWP) and then test their implications on Iberian reconstructions. We show that Iberian poles from the Early Cretaceous (mean poles for 123 and 130 Ma) are incompatible with the GAPWP, bringing into question their validity. Contrarily, Late Jurassic data (mean pole at 151 Ma) are compatible with the GAPWP and, thus, can be considered reliable. Based on these results, we propose a new magnetic reconstruction of Iberia and surrounding plates at ~150 Ma (M22 anomaly). This work provides new constraints for the kinematic evolution of Iberia during Jurassic‐Cretaceous. However, the development of a detailed and consensual model for the kinematic evolution of Iberia is dependent on the acquisition of new, high‐quality paleomagnetic data and a reevaluation of seafloor magnetic anomalies.