Geodynamic events leading to formation of passive western continental margin of India

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
T. Radhakrishna , B.K. Bansal , Ch. Ramakrishna
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引用次数: 2

Abstract

The geodynamic events of continental breakup and origin of northwest Indian Ocean led to the development of passive continental margin, off western India. However, causal mechanisms and relative chronology of these geodynamic events are not clearly known because of complex regional-scale ridges-basin physiography, multi-stage rifting in a short-time span and thick sediment cover. The Laxmi and adjacent Gop basins constitute key tectonic elements and geophysical investigations on them have come up with sharply divergent explanations of continental rifting and ocean spreading. We present geochemical results of the Laxmi Basin (LB) basement, recovered by the International Ocean Discovery Program Expedition-355 and interpreted in light of existing geophysical results. The basement is identified as continental rift basalt, different from the Deccan/Madagascan basalts. We suggest the basement eruption at ~75 Ma causing igneous underplating which triggered the extension/rifting in Laxmi and Gop basins. The rifting translated into ocean spreading only in the Gop Basin and not in the Laxmi Basin. The geodynamic events echoed soon with similar relative chronology in western India with Reunion plume impact and the Deccan eruption followed by second extension/rifting that culminated in India-Seychelles breakup.

导致印度被动西大陆边缘形成的地球动力学事件
大陆分裂和西北印度洋起源的地球动力学事件导致了印度西部被动大陆边缘的发育。然而,由于复杂的区域尺度脊-盆地貌、短时间跨度的多期裂陷和较厚的沉积物覆盖,这些地球动力学事件的成因机制和相对年代学尚不清楚。拉克西米盆地和邻近的Gop盆地构成了关键的构造要素,对它们的地球物理研究提出了大陆裂谷和海洋扩张的截然不同的解释。本文介绍了Laxmi盆地(LB)基底的地球化学结果,该结果由国际海洋发现计划远征-355恢复,并根据现有的地球物理结果进行了解释。基底确定为大陆裂谷玄武岩,不同于德干/马达加斯加玄武岩。我们认为在~75 Ma的基底喷发引起了火成岩底板,引发了拉克西米盆地和Gop盆地的伸展/裂陷。裂谷作用仅在Gop盆地转化为海洋扩张,而在Laxmi盆地则没有。地球动力学事件很快与印度西部的留尼汪羽流撞击和德干火山喷发相呼应,随后是第二次伸展/裂谷运动,最终导致印度-塞舌尔分裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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