• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Gravity Maps of Antarctic Lithospheric Structure from Remote-Sensing and Seismic Data
【24h】

Gravity Maps of Antarctic Lithospheric Structure from Remote-Sensing and Seismic Data

机译：遥感和地震数据南极岩石结构的重力图

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

Remote-sensing data from altimetry and gravity satellite missions combined with seismic information have been used to investigate the Earth's interior, particularly focusing on the lithospheric structure. In this study, we use the subglacial bedrock relief BEDMAP2, the global gravitational model GOCO05S, and the ETOPO1 topographic/bathymetric data, together with a newly developed (continental-scale) seismic crustal model for Antarctica to compile the free-air, Bouguer, and mantle gravity maps over this continent and surrounding oceanic areas. We then use these gravity maps to interpret the Antarctic crustal and uppermost mantle structure. We demonstrate that most of the gravity features seen in gravity maps could be explained by known lithospheric structures. The Bouguer gravity map reveals a contrast between the oceanic and continental crust which marks the extension of the Antarctic continental margins. The isostatic signature in this gravity map confirms deep and compact orogenic roots under the Gamburtsev Subglacial Mountains and more complex orogenic structures under Dronning Maud Land in East Antarctica. Whereas the Bouguer gravity map exhibits features which are closely spatially correlated with the crustal thickness, the mantle gravity map reveals mainly the gravitational signature of the uppermost mantle, which is superposed over a weaker (long-wavelength) signature of density heterogeneities distributed deeper in the mantle. In contrast to a relatively complex and segmented uppermost mantle structure of West Antarctica, the mantle gravity map confirmed a more uniform structure of the East Antarctic Craton. The most pronounced features in this gravity map are divergent tectonic margins along mid-oceanic ridges and continental rifts. Gravity lows at these locations indicate that a broad region of the West Antarctic Rift System continuously extends between the Atlantic-Indian and Pacific-Antarctic mid-oceanic ridges and it is possibly formed by two major faul
机译：来自高度偏移和重力卫星任务的遥感数据结合了地震信息，用于研究地球的内部，特别是关注岩石结构结构。在这项研究中，我们使用子污点基岩​​浮雕床上床2，全球引力模型Goco05s和ETOPO1地形/碱基数据，以及南极洲的新开发的（大陆级）地震地壳模型编译自由空气，Bouguer，在这个大陆和周围的海洋地区的地幔重力地图。然后我们使用这些重力图来解释南极地壳和最上面的地幔结构。我们证明，在重心图中可以通过已知的岩石结构来解释所见的大多数重力特征。 Bouguer重力图揭示了海洋和大陆地壳之间的对比，标志着南极大陆边缘的延伸。这种重力地图中的等静态签名在冈堡郊区山脉下的深层和紧凑的造山具，在东南部的Dronning Maud Land下更复杂的造山结构。虽然Bouguer重力图表现出与地壳厚度紧密空间相关的特征，但搭配重力图主要揭示最上面的地幔的重力签名，其叠加在密度异质性的较弱（长波长）签名上分布更深披风。与西南极洲的相对复杂和分割的最高的搭桥结构相比，地幔重力图证实了东南南极克拉顿的更均匀的结构。这种重力图中最明显的功能是沿着中海脊和大陆裂缝的不同构造边缘。这些位置的重力低点表明，西南极裂缝系统的广泛区域在大西洋 - 印度和太平洋南极中间山脉之间连续延伸，可能由Faul两个主要的主要组成

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