吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (1): 206-217.doi: 10.13278/j.cnki.jjuese.20180125
卢丽娟1,2, 蔡周荣1,2, 黄强太1,2, 姚永坚3, 刘海龄4
Lu Lijuan1,2, Cai Zhourong1,2, Huang Qiangtai1,2, Yao Yongjian3, Liu Hailing4
摘要: 南海具有复杂的地质构造背景,扩张结束以后,新构造运动活跃,但各区域新构造运动发生的时间及运动特征有较大差异。本文综合分析了南海各区域构造演化事件、现今构造格局及新构造运动的基本特征,认为南海新构造运动的起始时间为中中新世(约15 Ma)较合理。在此基础上,收集和整理了南海及邻区最新的地质和地球物理资料,对南海海域新构造期地层差异升降、活动断裂、天然地震以及岩浆活动等新构造表现形式进行了综合分析,系统总结了南海新构造运动特征,并根据活动断裂、天然地震以及岩浆活动等特征和分布规律分析,认为南海海域新构造的表现形式之间存在较大的耦合性。本文根据新构造运动表现形式在空间分布的不平衡性,将南海及邻区划分为1个强构造活动区、3个中等强度构造活动区以及1个弱构造活动区,并结合研究区应力场特征分析,认为南海新构造运动主要受控于东部菲律宾海板块和太平洋板块对东亚大陆边缘的持续俯冲碰撞作用。
中图分类号:
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