SEISMOLOGY AND GEOLOGY ›› 2014, Vol. 36 ›› Issue (3): 692-705.DOI: 10.3969/j.issn.0253-4967.2014.03.012

• CONTENTS • Previous Articles     Next Articles

A STUDY ON NEOTECTONIC MOVEMENT IN THE EAST CHINA SEA

ZHANG Li-fang1,2, XU Jie3, PENG Yan-ju2, JI Feng-ju3, LV Yue-jun2, ZHOU Ben-gang3   

  1. 1. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;
    2. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;
    3. Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • Received:2013-12-25 Revised:2014-07-11 Online:2014-09-30 Published:2014-09-30

东海地区新构造运动研究

张力方1,2, 徐杰3, 彭艳菊2, 计凤桔3, 吕悦军2, 周本刚3   

  1. 1. 中国地震局工程力学研究所, 哈尔滨 150080;
    2. 中国地震局地壳应力研究所, 北京 100085;
    3. 中国地震局地质研究所、活动构造与火山重点实验室, 北京 100029
  • 作者简介:张力方|男|1982年生|2008年在中国地震局地壳应力研究所获得固体地球物理硕士学位|助理研究员|主要从事地震活动性及地震区划方法研究|电话:010-62846755|E-mail:zhlifang222@ 163.com。
  • 基金资助:

    国家科技重大专项 “CAP1400安全审评技术及独立验证试验”项目(2011ZX0600201015)和“海域强震构造判断及海域工程抗震设防技术综合研究”(200708055)共同资助

Abstract:

The study area of this article covers the continental shelf of the East China Sea and the Okinawa Trough. Tectonically, the area is the seaward extension of the eastern China mainland, consisting of the East China Sea shelf basin, the Diaoyudao islands uplift-fold zone, and the Okinawa Trough Basin developed in Cenozoic. Lying at the conjunction between the Eurasian and Philippine plates, the neotectonic movement since Miocene and resultant geologic structure of this area are complicated and peculiar. Based on pervious data and studies, this paper makes a systematic and in-deep analysis to the features of the neotectonic movement in this region, involving geomorphology, geological structure, magma activity and earthquakes. Then, the dynamic conditions for the neotectonic movement of the study area are discussed.
Neotectonic movement of East China Sea started from middle Miocene and the mechanism of the tectonic stress field changed from sinistral transtension to sinistral transpression. The neotectonic movement in this area is inhomogeneous, with the continental shelf basin inclining and subsiding slightly to the southeast, the Okinawa trough dominated mainly by crustal active rifting, and the Diaoyu Islands fold belt characterized by lateral compressive bending uplift. The active faults, mainly trending NNE and NE, are dominantly distributed in the continental shelf basin, especially in the Okinawa trough. Magmatism and earthquake activity are also mainly distributed in the east of the continental shelf basin, especially in the Okinawa trough. The neotectonic movement in East China Sea is co-influenced by the back arc mantle uplift which is caused by the subduction of the Philippine plate beneath the continental shelf of East China Sea and results in the NW-SE rifting of Okinawa trough, and the southeastward movement of South China block which is pushed by the lateral extrusion of eastern Tibet.

Key words: neotectonic movement, East China Sea, shelf basin, Okinawa Trough, Miocene

摘要:

文中涉及的东海地区主要包括东海大陆架和冲绳海槽。该区的地质构造基本属于中国东部大陆向海域延伸的部分,新生代发育东海陆架盆地、钓鱼岛隆褶带和冲绳海槽盆地。由于东海位于大陆板块及其与菲律宾海板块接合的地带,中新世中期以来的新构造运动及其产生的地质构造具有独特性和复杂性。在充分解读前人有关资料和研究成果的基础上,从构造地貌、地质构造、岩浆活动和地震活动性等方面,对东海地区新构造运动的特征进行了较为系统而深入的分析研究,并在此基础上探讨了该区新构造运动的动力条件,取得了一些初步认识。东海地区新构造运动开始于中新世中期,构造应力作用由原先左旋剪切拉张转为左旋剪切挤压;区内新构造运动性质具有非一致性,东海陆架盆地表现整体微向SE倾斜下沉活动,冲绳海槽为主动机制的地壳拉张裂陷运动,钓鱼岛褶皱带具侧向挤压拱曲隆升活动;活动断裂以NNE和NE向为主,基本分布在东海陆架盆地以东地区,尤其是冲绳海槽;岩浆作用和地震活动也主要分布在东海陆架盆地东边,特别是冲绳海槽;东海地区的新构造运动,是菲律宾海板块往东海陆架之下俯冲导致弧后地幔隆起,引起冲绳海槽NW-SE向扩张,及与青藏高原东边地块被侧向挤出推动华南地块往东南运动共同作用的结果。

关键词: 新构造运动, 东海地区, 东海陆架盆地, 冲绳海槽盆地, 中新世中期

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