安达曼火山弧及其毗邻地区的形态构造特征,安达曼海

IF 1.4 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
K. K. Aswini, K. A. Kamesh Raju, C. M. Bijesh, V. Yatheesh, N. F. K. Zeba, Pawan Dewangan
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引用次数: 0

摘要

印度板块在巽他板块下方的斜向俯冲导致了印度洋东北部安达曼海多种形态构造的形成和海底地形的重大变化。内火山弧、狭长断层系统、狭长洋盆和弧后盆地是影响安达曼弧后地区构造环境和地球动力学的主要形态构造要素。我们对缅甸和苏门答腊岛的火山和断层系统进行了深入研究,但对连接缅甸和苏门答腊岛火山和断层系统的安达曼海海底火山和弧形断层网的形态构造却知之甚少。在本研究中,我们汇编了所有可用的高分辨率水深测量数据,这些数据覆盖了安达曼弧后地区约 14 万平方公里的区域,并对每个构造要素进行了详细的形态构造分析。数据显示,安达曼海有 33 座大小不一的海底火山,从休眠的纳孔达姆火山一直延伸到苏门答腊岛北部。此外,还分析了从苏门答腊岛北部到安达曼弧后扩张中心的主要断层系统,如大苏门答腊断层、西安达曼断层和安达曼-尼科巴断层。苏门答腊大断层向北延伸,形成若干分支,形成狭窄的海洋盆地。位于这些盆地中间的海底火山的存在表明,安达曼-尼科巴-苏门答腊火山弧横穿了这一狭窄的盆地区域。发育良好的陨石坑火山、频繁的地震群和陨石坑海山侧面的气体喷发表明,北纬 6 度至 8 度之间的尼科巴岛附近地区是火山弧近期最活跃的地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Morphotectonic characteristics of the Andaman volcanic arc and its adjoining regions, Andaman Sea

Morphotectonic characteristics of the Andaman volcanic arc and its adjoining regions, Andaman Sea

The oblique subduction of the Indian Plate beneath the Sunda Plate has resulted in the formation of diverse morphotectonic structures and major changes to the seafloor topography in the Andaman Sea, northeastern Indian Ocean. Inner volcanic arc, sliver fault system, narrow oceanic basins and backarc basins are the principal morphotectonic elements that influenced the tectonic setting and geodynamics of the Andaman backarc region. The volcanoes and fault systems in Myanmar and Sumatra are well studied, but we know relatively less about the morphotectonics of the submarine volcanoes and sliver fault networks in the Andaman Sea, that connect the volcanoes and fault systems in Myanmar and Sumatra. In the present study, we compiled the all-available high resolution bathymetry data which covers an area of approximately 140,000 km2 in the Andaman backarc region and provided a detailed morphotectonic analysis of each of the tectonic elements. The data show 33 submarine volcanoes of varying dimension in the Andaman Sea, that stretches from the dormant Narcondam volcano to the north of Sumatra Island. In addition, the major fault systems such as Great Sumatra Fault, West Andaman Fault and Andaman Nicobar Fault that starts from northern Sumatra and ends with Andaman Backarc Spreading Centre delineated from the high-resolution bathymetry data are analysed. Northward extension of the Great Sumatra Fault furcates into several branches, which produce narrow oceanic basins. The existence of submarine volcanoes situated in the middle of these basins indicate that the Andaman-Nicobar-Sumatra volcanic arc traverses through this narrow basinal area. The occurrence of well-developed cratered volcanoes, frequent earthquake swarms and gas emanations through the flanks of the cratered seamount suggest that the off Nicobar region between 6ºN to 8ºN is the most active part of the volcanic arc during the recent past.

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来源期刊
Geo-Marine Letters
Geo-Marine Letters 地学-地球科学综合
CiteScore
5.30
自引率
0.00%
发文量
16
审稿时长
>12 weeks
期刊介绍: Geo-Marine Letters is an international peer-reviewed journal focussing on the rapid publication of concise original studies and reviews dealing with processes, products and techniques in marine geology, geophysics, and geochemistry. Coverage spans - structural geology, including plate tectonics of recent active and passive margins - sea-bed morphology, physiography and morphodynamics - sediment transport, depositional processes and sedimentary facies analysis - stratigraphy, basin analysis and paleoenvironmental reconstruction - sea-level history, paleoproductivity, gas hydrates, salt domes and brines - sediment-water interaction and organism-sediment relationships - geochemical tracers, stable isotopes and authigenic mineral formation - geotechnical properties and application of new geo-marine techniques, and more. In addition to regular articles, reviews, discussion/reply articles and technical papers, Geo-Marine Letters welcomes contributions by guest editors in the form of conference/workshop proceedings, or bundles of papers dealing with specific themes.
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