We present here the results of a seismically well‐constrained potential field modeling along with process‐oriented gravity modeling across the Eastern Continental Margin of India (ECMI) and its conjugate East Antarctica Continental Margin (EACM). The study revealed both along‐strike variations in crustal architecture and effective elastic thickness (Te), showing a locally asymmetric pattern. Crustal stretching factors (β) estimated at these margins range between 1.5 and 4.0 with slightly lower values varying over the narrow zone in the Cauvery basin‐western Enderby basin and relatively higher values in other margin segments. The models reveal typical magma‐poor margin characteristics in the Krishna‐Godavari (K‐G) and Cauvery basin segments of ECMI. The ocean‐continent transition (OCT) in the K‐G basin and its conjugate (central Enderby basin) indicates asymmetric rifting marked by the development of a detachment fault separating the combined India‐Elan Bank margin and the EACM. The higher β values and magmatic underplating at OCT in the Mahanadi basin segment of ECMI may be related to the post‐breakup magmatic emplacement associated with the proximal activity of the Kerguelen plume after the separation of Elan Bank from India by a ridge jump during M2/M0 (124–120 Ma). The pre‐rift reconstruction model through the palinspastic restoration of margins suggests that the central part of ECMI (16–20°) is the ideal pre‐rift location for the Elan bank.

中文翻译：

---

印度-埃兰银行-南极东部的分崩离析，地壳建筑和利润率演变：受约束的势场和共轭利润线段的过程导向重力模型的结果

我们在此介绍了在印度东部大陆边缘（ECMI）及其共轭南极大陆边缘（EACM）上受地震约束的势场模型以及面向过程的重力模型的结果。该研究揭示了地壳构造的沿走向变化和有效弹性厚度（Te），显示出局部非对称模式。在这些边缘处估计的地壳伸展因子（β）在1.5到4.0之间，在Cauvery盆地-恩德比盆地西部的狭窄区域中，值略低，而在其他边缘段中，值相对较高。该模型揭示了ECMI的克里希纳-戈达瓦里（K-G）和Cauvery盆地段的典型岩浆贫化边缘特征。K‐G盆地及其共轭体（Enderby盆地中部）的海陆过渡（OCT）指示不对称裂谷，其特征是分离印度-伊兰银行合并的边缘和EACM的分离断层的发展。ECMI Mahanadi盆地段的OCT处较高的β值和岩浆地下活动，可能与M2 / 2期间伊兰库克与印度的隆起跃迁有关，与破裂后的岩浆侵位与Kerguelen羽的近端活动有关。 M0（124–120 Ma）。通过边缘的痉挛恢复进行的裂谷前重建模型表明，ECMI的中部（16–20°）是义隆河岸理想的裂谷前位置。ECMI Mahanadi盆地段的OCT处较高的β值和岩浆地下活动，可能与M2 / 2期间伊兰库克与印度的隆起跃迁有关，与破裂后的岩浆侵位与Kerguelen羽的近端活动有关。 M0（124–120 Ma）。通过边缘的痉挛恢复进行的裂谷前重建模型表明，ECMI的中部（16–20°）是义隆河岸理想的裂谷前位置。ECMI Mahanadi盆地段的OCT处较高的β值和岩浆地下活动，可能与M2 / 2期间伊兰库克与印度的隆起跃迁有关，与破裂后的岩浆侵位与Kerguelen羽的近端活动有关。 M0（124–120 Ma）。通过边缘的痉挛恢复进行的裂谷前重建模型表明，ECMI的中部（16–20°）是义隆河岸理想的裂谷前位置。