• 主题
高级搜索  >
历史搜索 清空历史
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 >Motion of Africa and Adria since the Permian: paleomagnetic and paleoclimatic constraints from northern Libya
【24h】

Motion of Africa and Adria since the Permian: paleomagnetic and paleoclimatic constraints from northern Libya

机译：二叠纪以来非洲和亚德里亚的运动：利比亚北部的古地磁和古气候限制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Paleomagnetic and biostratigraphic data from the Al Azizia Formation of northwestern Libya, consisting of uppermost Middle Triassic/lowermost Upper Triassic limestones, shed new light on the latitudinal drift of Africa and Adria and related climatic changes. A characteristic component of magnetization carried by magnetite delineates paleomagnetic poles which are coincident with coeval poles from the Southern Alps. Data from this study and the literature are integrated, showing that relatively unrotated remnants of the Adria margin like the Southern Alps (e.g., the Dolomites), Istria, Gargano, Apulia and Iblei moved in close conjunction with Africa since at least Permian times. A Permian-Cenozoic apparent polar wander (APW) curve for Africa/Adria is constructed. The paleolatitude trend for northern Libya calculated from this APW superposed to the zonal latitudinal bands of relative aridity and humidity typical of modern-day climate predicts that northern Libya drifted northwards from the equatorial belt to the arid tropic during the Triassic, and crossed the humid subequatorial/arid subtropical boundary zone at Late Triassic times. This inference is fully supported by Permo-Triassic palynological and facies analysis from this study and the literature. We conclude that a zonal climate model coupled with paleomagnetically constrained paleogeographic reconstructions provides a powerful null hypothesis for understanding past climatic conditions.
机译：来自利比亚西北部的Al Azizia组的古地磁和生物地层学数据，由最高的中三叠纪/最低的上三叠纪石灰岩组成，为非洲和Adria的纬向漂移以及相关的气候变化提供了新的思路。磁铁矿携带的磁化强度的特征部分描绘了古磁极，该极磁极与来自南阿尔卑斯山的同时期极重合。这项研究和文献中的数据已经整合在一起，表明至少从二叠纪以来，像南部阿尔卑斯山（如白云岩），伊斯特拉，加尔加诺，普利亚和伊比莱这样的相对未旋转的阿德里亚边缘遗迹与非洲紧密地联系在一起。绘制了非洲/亚德里亚的二叠纪-新生代表观极地游走（APW）曲线。根据该APW计算的利比亚北部古纬度趋势叠加到典型的现代气候的相对干旱和湿度带纬度纬度带上，预示了三叠纪期间利比亚北部从赤道带向干旱热带地区北移，并穿过了湿润的赤道下层三叠纪晚期的/ arid亚热带边界带。该研究和文献中的Permo-Triassic孢粉学和相分析充分支持了这一推论。我们得出的结论是，纬向气候模型与古磁约束古地理重建相结合，为理解过去的气候条件提供了强有力的零假设。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号