摘要
张裂陆缘作为威尔逊旋回中关键的一环,是研究地球板块构造及其演化过程的重要构造单元.本文阐述了3种类型张裂陆缘(富岩浆型、贫岩浆型和中间型)的地壳结构特征,总结了它们的演化过程与机制,分析表明构造作用、岩浆活动程度、先存结构等是形成不同类型张裂陆缘的主要控制因素.针对南海北部陆缘复杂的构造属性与演化机制问题,提出了今后重点研究方向:南海北部陆缘是否同时具有贫岩浆型与富岩浆型的部分特征;南海北部陆缘丰富的岩浆活动与蛇纹石化地幔剥露能否共存.在南海北部陆缘同时开展三维深地震探测、物理模拟和数值模拟几种手段联合研究,相互约束,共同验证,是建立科学可信的张裂-破裂机制地质模型的必要途径.
As an important part of Wilson Cycles, the rifted margin is a critical area in the study of plate tectonics and its evolution.By comparing the crustal structure characteristics and evolution process in three typical rifted margins(magma-rich, magma-poor,magma-intermediate), the main factors, e.g., tectonism, magmatic activity, pre-existing structure and so on, are considered to control the formation of different types of rifted margins. In view of the complex tectonic properties and evolution mechanism of the northern margin of the South China Sea(SCS), We propose the key scientific questions and direction for the future:(a) The northern margin of the SCS has a special mechanism possessing partial characteristics of both magma-poor and magma-rich margin;(b) whether the abundant magmatic activities and serpentined mantle exhumation coexist in the northern SCS margin;(c) it is necessary to carry out 3D deep seismic exploration integrated with physical and numerical simulation, so as to establish a scientific and credible geological model of rifting and breakup in the northern SCS margin.
作者
袁野
赵明辉
贺恩远
关慧心
高金尉
张佳政
Yuan Ye;Zhao Minghui;He Enyuan;Guan Huixin;Gao Jinwei;Zhang Jiazheng(Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 511458,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;Institute of Deep-Sea Science and Engineering,Chinese Academy of Sciences,Sanya 572000,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2021年第3期801-816,共16页
Earth Science
基金
国家自然科学基金项目(Nos.41730532,91958212,42002222,91858207,91858212)
南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(No.GML2019ZD0204)
广东省基金团队项目(No.2017A030312002)。
关键词
张裂陆缘类型
洋陆转换带
地壳结构
南海北部陆缘
张裂-破裂模式
海洋地质
types of rifted margins
ocean-continent transition
crustal structure
the northern SCS margin
model of rift and breakup
marine geology
