• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Isostatic Model and Isostatic Gravity Anomalies of the Arabian Plate and Surroundings
【24h】

Isostatic Model and Isostatic Gravity Anomalies of the Arabian Plate and Surroundings

机译：阿拉伯板块及其周围环境的等静模型和等静重力异常

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

The isostatic modeling represents one of the most useful "geological" reduction methods of the gravity field. With the isostatic correction, it is possible to remove a significant part of the effect of deep density heterogeneity, which dominates in the Bouguer gravity anomalies. Although there exist several isostatic compensation schemes, it is usually supposed that a choice of the model is not an important factor to first order, since the total weight of compensating masses remains the same. We compare two alternative models for the Arabian plate and surrounding area. The Airy model gives very significant regional isostatic anomalies, which cannot be explained by the upper crust structure or disturbances of the isostatic equilibrium. Also, the predicted "isostatic" Moho is very different from existing seismic observations. The second isostatic model includes the Moho, which is based on seismic determinations. Additional compensation is provided by density variations within the lithosphere (chiefly in the upper mantle). According to this model, the upper mantle under the Arabian Shield is less dense than under the Platform. In the Arabian platform, the maximum density coincides with the Rub' al Khali, one of the richest oil basin in the world. This finding agrees with previous studies, showing that such basins are often underlain by dense mantle, possibly related to an eclogite layer that has caused their subsidence. The mantle density variations might be also a result of variations of the lithosphere thickness. With the combined isostatic model, it is possible to minimize regional anomalies over the Arabian plate. The residual local anomalies correspond well to tectonic structure of the plate. Still very significant anomalies, showing isostatic disturbances of the lithosphere, are associated with the Zagros fold belt, the collision zone of the Arabian and Eurasian plates.
机译：等静压模型代表了重力场最有用的“地质”还原方法之一。通过等静校正，可以消除深密度异质性影响的很大一部分，而该密度异质性在布格重力异常中占主导地位。尽管存在几种等静压补偿方案，但通常认为模型的选择不是一阶的重要因素，因为补偿质量的总重量保持不变。我们比较了阿拉伯板块和周围地区的两种替代模型。艾里模型给出了非常重要的区域等静异常，这不能用上地壳结构或等静平衡的扰动来解释。而且，预测的“等静”莫霍面与现有地震观测结果有很大不同。第二个等静模型包含基于地震确定的Moho。岩石圈内（主要是上地幔中）的密度变化提供了额外的补偿。根据此模型，阿拉伯盾下方的上地幔密度不及平台下方。在阿拉伯平台上，最大密度与世界上最富裕的石油盆地之一卢布·哈利（Rub'al Khali）吻合。这一发现与以前的研究相吻合，表明这类盆地经常被致密的地幔覆盖，可能与引起其沉降的榴辉岩层有关。地幔密度变化也可能是岩石圈厚度变化的结果。利用组合的等静模型，可以最小化阿拉伯板块上的区域异常。残余的局部异常与板块的构造结构很好地对应。 Zagros褶皱带，阿拉伯板块和欧亚板块的碰撞带仍然是非常显着的异常，显示出岩石圈的等静线干扰。

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