New Ideas about the Structure and Nature of the Crust of the Western Bay of Bengal, Obtained Taking into Account Deep Seismic Sounding Data

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-02 DOI:10.1134/s0001437024700127

V. K. Illarionov, O. Yu. Ganzha, D. A. Ilyinsky, K. A. Roginskiy, A. Yu. Borisova

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Abstract

A comprehensive analysis of geological and geophysical data characterizing the structure of the eastern continental margin of India and the adjacent part of the bottom of the Bay of Bengal has been carried out. According to the structural and tectonic features, three sectors are distinguished: southern, central, and northern, the natural boundaries between which are the fault zones of the Makhanadi and Godavari–Krishna aulacogens. In the central sector, the pericontinental East Indian Plateau adjoins the continental slope. In 2003, the R/V Mezen acquired deep seismic sounding data on two profiles in this region. These data and their geological interpretation made it possible to identify “reduced” continental crust, characterized by reduced thickness of the upper, middle, and lower layers. A conclusion is drawn about the continental nature of the East Indian Plateau and northern part of the 85° Ridge adjacent to it. The light sialic and effusive rocks that form the top of the ridge give a negative gravimetric anomaly in the free-air reduction, which is its distinguishing feature.

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根据深海地震探测数据获得的有关孟加拉湾西部地壳结构和性质的新观点

摘要对地质和地球物理数据进行了全面分析，这些数据说明了印度东部大陆边缘和孟加拉湾底邻近部分的结构特征。根据结构和构造特征，可将其分为三个部分：南部、中部和北部，这三个部分之间的自然边界是马卡纳迪断裂带和戈达瓦里-克里希纳断裂带。在中部地区，大陆周缘的东印度高原与大陆坡相邻。2003 年，R/V Mezen 在该地区的两个剖面上获得了深层地震探测数据。这些数据及其地质解释使我们得以确定 "缩小的 "大陆地壳，其特点是上层、中层和下层厚度减小。由此得出结论，东印度高原及其毗邻的 85°海脊北部具有大陆性质。构成海脊顶部的轻矽卡岩和喷出岩在自由空气还原中产生负重力异常，这是其显著特征。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.