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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Gravity Maps of the Lithospheric Structure Beneath the Indian Ocean
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Gravity Maps of the Lithospheric Structure Beneath the Indian Ocean

机译：印度洋下面的岩石结构的重力图

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摘要

The lithospheric structure beneath the Indian Ocean is probably the most complicated, but at the same time, the least understood among world's oceans. Results of tomographic, geochemical, magnetic and other surveys provide the evidence of its complex geological history. Seismic surveys have been a primary source of information about the lithospheric structure beneath the Indian Ocean, but these experiments are mainly concentrated at locations of a high geophysical interest. Marine gravity data obtained from processing the satellite altimetry measurements, on the other hand, deliver a detailed image of the whole seafloor relief, advancing further the knowledge about its formation, tectonism and volcanism. In this study, we use gravitational, bathymetric, marine sediment and lithospheric density structure data to compile the Bouguer and mantle gravity maps. We then use both gravity maps to interpret the lithospheric structure beneath the Indian Ocean. The Bouguer gravity map reveals major tectonic and volcanic features that are spatially correlated with crustal thickness variations. The mantle gravity map exhibits mainly a thermal signature of the lithospheric mantle. Gravity lows in this gravity map mark distinctively active oceanic divergent tectonic margins along the Central, Southeast and Southwest Indian Ridges including also the Carlsberg Ridge. Gravity lows extend along the Red Sea-Gulf of Aden and East African Rift Systems, confirming a connection between mid-oceanic spreading ridges (in the Indian Ocean) and continental rift systems (in East Africa). The combined interpretation of the Bouguer and mantle gravity maps confirms a non-collisional origin of mountain ranges along continental rift systems in East Africa. The evidence of a southern extension of the East African Rift System and its link with the Southwest Indian Ridge in the mantle gravity map is absent. Similarly, the ongoing breakup of the composite Indo-Australian plate is not manifested. A missing
机译：印度洋下面的岩石结构可能是最复杂的，但同时，世界上的海洋中最不理解。断层切断结果，地球化学，磁性和其他调查提供了其复杂地质史的证据。地震调查一直是印度洋下岩石结构的主要信息来源，但这些实验主要集中在高地球物理利益的位置。另一方面，从处理卫星高度测量的海洋重力数据，提供整个海底救济的详细图像，进一步推进了对其形成，构造和火山的知识。在这项研究中，我们使用引力，碱基，海洋沉积物和岩石密封结构数据来编制Bouguer和Mantle重力图。然后我们使用重力图来解释印度洋下面的岩石结构。 Bouguer重力图显示了与地壳厚度变化的空间相关的主要构造和火山功能。 Mantle重力图主要展示岩石罩的热签名。在这种重力地图中的重力地图标记了沿着中央，东南和西南印度山脊的明显活跃的海洋分歧边缘，包括卡尔斯伯格山脊。重力低点沿着亚丁和东非裂口系统的红海 - 海湾延伸，确认了中海传播山脊（印度洋）和大陆裂缝系统（东非）之间的联系。 Bouguer和Mantle Gravity图的组合解释证实了东非大陆裂缝系统的山脉的非碰撞起源。缺席了东非裂谷系统南部延伸的证据及其与西南印度山脊的联系。同样，复合Indo-澳大利亚板块的持续分解并不表现出来。失踪

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