• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Crustal structure beneath the Orange Basin, South Africa
【24h】

Crustal structure beneath the Orange Basin, South Africa

机译：南非奥兰治盆地下的地壳结构

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

Although the development of passive margins has been extensively studied over a number of decades, significant questions remain on how mantle and crustal dynamics interact to generate the observed margin geometries. Here, we investigate the Orange Basin, located on the south-west African continental margin. The basin fill is considered to comprise a classic rift-drift passive margin sequence recording the break-up of Gondwana and subsequent opening of the South Atlantic Ocean. Based on interpreted seismic reflection data, a 3D geological model was first constructed. Subsequently, an isostatic calculation (Airy's model) using a homogeneous middle and lower crust was applied to this geological model to determine the position of the Moho for an isostatically balanced system. Isostatic sensitivity tests were applied to the model and their gravity response was validated against different crustal structures for the basin. The best-fit model requires dense, presumably mafic material, in the middle and lower crust beneath the basin and an abrupt change to less dense material near the coast to reproduce the observed gravity field.
机译：尽管被动边缘的发展已经进行了数十年的广泛研究，但是关于地幔和地壳动力学如何相互作用以产生观察到的边缘几何结构仍然存在重大问题。在这里，我们调查了位于西南非洲大陆边缘的奥兰治盆地。盆地填充被认为包括一个经典的纵波漂流被动边缘序列，记录了冈瓦纳的破裂和随后南大西洋的开放。根据解释的地震反射数据，首先构建了3D地质模型。随后，将使用均匀的中，下地壳的等静压计算（艾里模型）应用于该地质模型，以确定等静压平衡系统的Moho位置。将等静力敏感性测试应用于该模型，并针对盆地的不同地壳结构验证了其重力响应。最佳拟合模型要求盆地下方中下地壳中含有致密的大概是镁铁质物质，并在海岸附近突然转变为密度较小的物质，以重现观测到的重力场。

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