• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geochemistry, geophysics, geosystems >The Dynamic History of 220 Million Years of Subduction Below Mexico: A Correlation Between Slab Geometry and Overriding Plate Deformation Based on Geology, Paleomagnetism, and Seismic Tomography
【24h】

The Dynamic History of 220 Million Years of Subduction Below Mexico: A Correlation Between Slab Geometry and Overriding Plate Deformation Based on Geology, Paleomagnetism, and Seismic Tomography

机译：墨西哥220万年郊区的动态历史：基于地质，古磁化和地震层析成像的板坯几何形状与覆盖板变形的相关性

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

Global tectonic reconstructions of pre-Cenozoic plate motions rely primarily on paleomagnetic and geological data from the continents, and uncertainties increase significantly with deepening geological time. In attempting to improve such deep-time plate kinematic reconstructions, restoring lost oceanic plates through the use of geological and seismic tomographical evidence for past subduction is key. The North American Cordillera holds a record of subduction of oceanic plates that composed the northeastern Panthalassa Ocean, the large oceanic realm surrounding Pangea in Mesozoic times. Here we present new paleomagnetic data from subduction-related rock assemblages of the Vizcaíno Peninsula of Baja California, Mexico, which yield a paleolatitudinal plate motion history equal to that of the North American continent since Late Triassic time. This indicates that the basement rocks of the Vizcaíno Peninsula formed in the forearc of the North American Plate, adjacent to long-lived eastward dipping subduction at the southern part of the western North American continental margin. Tomographic images confirm long-lived, uninterrupted eastward subduction. We correlate episodes of overriding plate shortening and extension to flat and steep segments of the imaged slab. By integrating paleomagnetic, geological, and tomographic evidence, we provide a first-order model that reconciles absolute North American plate motion and the deformation history of Mexico since Late Triassic time with modern slab structure. Summary Reconstruction of deep-time global tectonic plate motions relies primarily on data derived from the rock record of the continents, as the vast majority of pre-Cenozoic oceanic crust has been recycled into the Earth's mantle in subduction zones. To improve deep-time plate tectonic reconstructions, adding information on the plate motions and the geometry of lost oceanic plates is therefore key. In this study, we attempt at reconstructing the subduction of oceanic plat
机译：主要在古代磁性和地质数据的全球构造重建依赖于来自大洲的古磁性和地质数据，并且随着地质时间深度增长，不确定性会显着增加。在试图改进此类深度片运动的运动重建时，通过使用过去俯冲的地质和地震性质的证据来恢复失落的海洋板是关键。北美海豚拥有一系列植物郊区，组成了东北蓬天海达海洋，围绕中生宫周围的大海洋境界。在这里，我们从墨西哥Baja California的Vizcaíno半岛的俯冲相关岩石装配中展示了新的古磁性数据，从而从晚期三叠纪时间以来，产生古光板的行动历史等于北美大陆的古代板。这表明，Vizcaíno半岛的基底岩石在北美板块的前臂形成，毗邻北美大陆南部南部的长期东地浸渍俯冲。断层图像确认长期，不间断的东部俯冲。我们将推翻板缩短和延伸的集发作相关联到成像板的平坦和陡段。通过整合古磁体，地质和断层扫描证据，我们提供了一阶模型，以便与现代平板结构的晚期三叠纪时间以来，对墨西哥的绝对北美板运动和墨西哥的变形史进行调和。总结深度全球构造板运动的重建主要依赖于来自大陆摇滚记录的数据，因为绝大多数前心上生海壳已被回收到地球的俯冲区。为了改善深度挡板构造重建，增加了有关板运动的信息和丢失的海底的几何形状是关键。在这项研究中，我们尝试重建海洋平台的俯冲

著录项

相似文献

  • 外文文献
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