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首页> 外文期刊>Journal of Asian earth sciences >Crustal architecture and isostatic compensation of the Comorin Ridge, central Indian Ocean: Implications for the breakup of east Gondwana
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Crustal architecture and isostatic compensation of the Comorin Ridge, central Indian Ocean: Implications for the breakup of east Gondwana

机译：Comorin Ridge，中央海洋的地壳建筑和等静电补偿：对东峡谷分手的影响

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摘要

The Comorin Ridge, located off the southwest margin of Sri Lanka is an important geological feature with significant relevance to understand the breakup of eastern Gondwanaland. Earlier geophysical studies over this ridge provided several contrasting views due to which its origin and nature of emplacement could not be established very well. In this study, an integrated interpretation of bathymetry, gravity, geoid, and ship-borne magnetic data is carried out to bring out a well-constrained evolution model for the ridge. Results of 3-D gravity inversion of Crustal Bouguer anomalies and joint gravity-magnetic modeling indicate that the southern part of the ridge is underlain by 7-12 km thick crust intruded with volcanic rocks and the presence of 13-18 km of anomalously thicker crust below the northern part of the ridge. Further, crustal models, spatial variations in Geoid-Topography Ratio (GTR), and the effective elastic thickness (Te) value obtained in this study suggest a two-stage emplacement model for the evolution of the ridge. The observed lower Te values (7-8 km) in the southern part (0.5 degrees N-3.5 degrees N) and its proximity to the C34ny spreading anomaly suggest its emplacement on the oceanic lithosphere due to Marion plume activity along a fracture zone during similar to 88-84 Ma. On the other hand, relatively higher Te values (12.5-15 km) in the northern part (3.5 degrees N-6.5 degrees N) with absence seafloor-spreading magnetic anomalies suggests that it could be a marginal basement high formed at the continent-ocean boundary (COB) during the second phase of rifting between India and Sri Lanka (similar to 94 Ma).
机译：位于斯里兰卡西南缘的科米林岭是一个重要的地质特征，与了解东戈尔卡拉尔兰的破碎有关。在这个山脊上的早期地球物理学研究提供了几种对比视图，因为它的起源和施加的性质无法建立得很好。在这项研究中，进行了碱基测量，重力，大线和船舶磁数据的综合解释，为脊开辟了一个受影响的进化模型。结果表壳Bouguer异常和关节重力 - 磁性建模的结果表明，山脊的南部是厚的7-12公里的地壳，侵入火山岩和13-18公里的异常厚壳在山脊的北部。此外，地壳模型，大量地形率（GTR）的空间变化以及本研究中获得的有效弹性厚度（TE）值表明了脊的演化的两级施加模型。南部（0.5°N-3.5度N）的观察到的下部值（7-8 km）及其对C34ny扩散异常的邻近，表明它由于在类似的裂缝区沿着裂缝区的马里昂羽毛活动而施加了对海洋岩石圈的施加到88-84 mA。另一方面，北部的相对较高的TE值（12.5-15公里）（3.5度N-6.5度N），没有缺乏海底展开的磁异常表明它可能是在大陆海洋中形成的边缘地下室边界（COB）在印度和斯里兰卡之间徘徊的第二阶段（类似于94 mA）。

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