[1]程昊皞,索艳慧,李三忠.2021.印度西部洋陆过渡区结构特征及构造演化.大地构造与成矿学,45(5):851-860.doi:10.16539/j.ddgzyckx.2021.05.002
 CHENG Haohao,SUO Yanhui,LI Sanzhong.2021.Structural Properties and Tectonic Evolution of the Western Indian Continental Margin.Geotectonica et Metallogenia,45(5):851-860.doi:10.16539/j.ddgzyckx.2021.05.002
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印度西部洋陆过渡区结构特征及构造演化
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2021年45卷05期
页码:
851-860
栏目:
构造地质学
出版日期:
2021-10-25

文章信息/Info

Title:
Structural Properties and Tectonic Evolution of the Western Indian Continental Margin
文章编号:
1001-1552(2021)05-0851-010
作者:
程昊皞1、2 索艳慧1、2* 李三忠1、2 梁 杰3 杨传胜3 王光增1、2 周 洁1、2 于海洋1、2 王新毓1、2
1.深海圈层与地球系统教育部前沿科学中心, 海底科学与探测技术教育部重点实验室, 中国海洋大学 海洋地球科学学院, 山东 青岛 266100; 2.青岛海洋科学与技术国家实验室 海洋矿产资源勘探与评价功能实验室, 山东 青岛 266100; 3.中国地质调查局 青岛海洋地质研究所, 山东 青岛 266071
Author(s):
CHENG Haohao1、2 SUO Yanhui1、2* LI Sanzhong1、2 LIANG Jie3 YANG Chuansheng3 WANG Guangzeng1、2 ZHOU Jie1、2 YU Haiyang1、2 and WANG Xinyu1、2
1. Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao 266100, Shandong, China; 2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, Shandong, China; 3. Qingdao Institute of Marine Geology, CGS, Qingdao 266071, Shandong, China
关键词:
印度西缘 火山型被动陆缘 地壳结构 构造演化
Keywords:
the western Indian continental margin volcanic passive continental margin crustal structure tectonic evolution
分类号:
P542
DOI:
10.16539/j.ddgzyckx.2021.05.002
文献标志码:
A
摘要:
印度西部洋陆过渡区位于上印度扇, 处于印度板块、阿拉伯板块和欧亚板块交汇处, 周缘发育多种板块边界类型, 构造特征复杂。前人对该区域的构造性质及演化的研究较少, 其内部一级构造的地壳性质认识存在争议。本文在对地震资料构造解析的基础上, 分析了印度扇近海盆地、默里脊系统和拉克西米山脊的断裂样式、断裂组合以及盆地结构特征, 揭示印度西缘的洋陆过渡区为发育向海倾斜反射层(SDRs)和下地壳高速体(HVZ)的火山型被动陆缘。其中, 印度扇近海盆地的断层多构成地堑、半地堑和地垒组合, 地壳性质为减薄陆壳; 默里脊系统表现为右行张扭性质, 以小默里脊为界, 以西为正在低速扩张的洋壳基底, 以东为减薄的陆壳; 拉克西米山脊地壳性质则为减薄的陆壳。印度西缘的洋陆过渡区的形成与白垩纪以来马达加斯加板块、塞舌尔微板块和印度板块之间的多期裂解事件, 以及多个热点导致的岩浆事件有关。此外, 运用2DMove软件进行了平衡剖面恢复, 揭示了印度扇在新生代以来经历了古-始新世初始伸展断陷期、渐新世-早中新世稳定沉积期、中-晚中新世张扭断陷期和上新世以来的热沉降期4个构造演化阶段。
Abstract:
The western Indian continental margin is located at the intersection of the Indian Plate, Arabian Plate and Eurasian Plate, developed within a complex tectonic setting. There are few researches on the structure and properties of the Indian continental margin, and its crustal type of the first-level tectonic unit remains controversial. Based on the tectonic interpretation of seismic profiles, we analyzed the geological structure of the Indus Fan offshore basin, Murray ridge system and Laxmi Ridge. Our results indicate that the Indus Fan offshore basin belongs to the ocean-continent transition zone of the passive continental margin. The dextral transtensional Murray ridge system is subdivided into two parts by the little Murray Ridge, the western part is characterized by slow-spreading oceanic crustal basement, whereas the eastern part is characterized by thinning continental crust. The Laxmi ridge has a thinning continental crust. The Indus fan belongs to the volcanic passive continental margin, characterized by the seaward dipping reflectors (SDRs) and the high velocity lower crust (HVZ). Formation of the continental margin is related to the multi-stage rifting events and the accompanying magmatic events between Madagascar, Seychelles and Indian since the Cretaceous. The balanced profile across the Indus fan offshore basin reveals that it experienced four tectonic stages during the Cenozoic, including the initial rifting period from the Paleocene to the Eocene, the stable sedimentary period from the Oligocene to the Early Miocene, the Middle-Late Miocene transtensional faulting stage, and the thermal subsidence stage since the Late Miocene.

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备注/Memo

备注/Memo:
收稿日期: 2020-08-15; 改回日期: 2020-10-30 项目资助: 国家自然科学基金项目(91958214、41976054)、国家科技重大专项(2016ZX05004001-003)、泰山学者项目对李三忠和刘永江教授的资助和青岛创新领军人才(19-3-2-19-zhc)、中国地质调查局青岛海洋地质研究所《区域构造特征研究》项目(QCZ2019-011627122)联合资助。 第一作者简介: 程昊皞(1997-), 男, 硕士研究生, 海洋地质专业。Email: 794455495@qq.com 通信作者: 索艳慧(1987-), 女, 副教授, 硕士生导师, 从事构造地质学及海洋地质学研究。Email: suoyh@ouc.edu.cn
更新日期/Last Update: 2021-09-20