The Mesozoic Subduction Zone over the Dongsha Waters of the South China Sea and Its Significance in Gas Hydrate Accumulation

Author:

Su Pibo123ORCID,Zhao Zhongquan1ORCID,Zhang Kangshou1

Affiliation:

1. Guangzhou Marine Geological Survey, Guangzhou 510301, China

2. Sanya Institute of South China Sea Geology, Guangzhou Marine Geological Survey, Sanya 572025, China

3. National Engineering Research Center for Gas Hydrate Exploration and Development, Guangzhou 511458, China

Abstract

The Mesozoic subduction zone over the Dongsha Waters (DSWs) of the South China Sea (SCS) is a part of the westward subduction of the ancient Pacific plate. Based on the comprehensive interpretation of deep reflection seismic profile data and polar magnetic anomaly data, and the zircon dating results of igneous rocks drilled from well LF35-1-1, the Mesozoic subduction zone in the northeast SCS is accurately identified, and a Mesozoic subduction model is proposed. The accretion wedges, trenches, and igneous rock zones together form the Mesozoic subduction zone. The evolution of the Mesozoic subduction zone can be divided into two stages: continental subduction during the Late Jurassic and continental collision during the late Cretaceous. The Mesozoic subduction zone controlled the structural pattern and evolution of the Chaoshan depression (CSD) during the Mesozoic and Neogene eras. The gas source of the hydrate comes from thermogenic gas, which is accompanied by mud diapir activity and migrates along the fault. The gas accumulates to form gas hydrates at the bottom of the stable domain; BSR can be seen above the mud diapir structure; that is, hydrate deposits are formed under the influence of mud diapir structures, belonging to a typical leakage type genesis model.

Funder

Hainan Province key research and development project

National Natural Science Foundation of China

Publisher

MDPI AG

Reference102 articles.

1. Polarity-reversal subduction zone initiation triggered by buoyant plateau obstruction;Almeida;Earth Planet. Sci. Lett.,2022

2. Geological evolution of the West Luzon Basin (South China Sea, Philippines);Arfai;Mar. Geophys. Res.,2011

3. Evolution of the South China Sea: Revised ages for breakup and seafloor spreading;Barckhausen;Mar. Pet. Geol.,2014

4. Tectonic dynamics of eastern China since the formation of the Pacific Plate;Bao;Adv. Earth Sci.,2013

5. A new insight on the geometry of subducting slabs in northern Luzon, Philippines;Bautista;Tectonophysics,2001

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3