东海新构造与新构造运动
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摘要
各种调查资料表明,东海自上新世晚期以来,新构造运动比较明显,主要表现形式有断裂、褶皱、地震、岩浆的侵入与喷发,海底热液活动以及区域构造的升降与岸线变迁等。新构造运动主要以升降作用为特征,升降具有振荡性与间断性。新构造运动的区域差异现象明显且在某些地区具有一定的继承性。同时,新构造活动还有明显的带状分布特征,它们大体上沿大陆边缘呈NE(或NEE)—NNE向分布,主要有2个带:东带沿冲绳海槽展布,西带沿东海陆架西部—沪、浙、闽、粤近海展布。在两个新构造活动带之间的东海陆架主体部位,是新构造活动的平静区。西带的新构造活动主要表现断裂与地震活动及区域升降作用;而东带的新构造活动远较西带强烈,不仅有大量的断裂与频繁的地震活动及地壳的升降运动,还出现很多褶皱构造,大规模的岩浆侵入与喷发以及海底热液活动。此一地区强烈的新构造运动表明,第四纪时期海槽的扩张作用还在加剧,它也是板块俯冲作用活跃的一种表现。
Since late Pliocene,neotectonic movement in the East China Sea has been intensified,and the most obvious features of the neotectonic movement include faults,folds,magmatic intrusion and eruption,seafloor hydrothermal activities,and coastal changes,etc.The neotectonic movement is characteriged by vertical large-scale block-faulting,in an oscillating and episodic manner.Regional difference of neotectonic movement is apparent and shows continuity to cerlain extent in some areas.Meantime,the neotectonic movement occurs in NE(or NEE)～NNE direction along the continent margin,and includes two parts:the eastern belt along the Okinawa Trough and the western belt along the western border of the East China Sea shelf,which extends from—Shanghai,to Zhejiang,Fujian,and Guangdong offshore regions.A tranquil zone of neotectonic movement occurs between the two belts.Neotectonic movement is mainly characterized by faulting,seismic activities,and large-amplitude block-faulting in the western belt;but more intensified in the eastern belt.It includes not only faulting,frequently earthgualce activities,and large-amplitude block-faulting,but also folding,large-scale intrusion and eruption of magmatic rocks,and seafloor hydrothermal activities.Intensive neotectonic movement in the East China Sea owes its origin to the intensitied trough extension in Quaternary,as one of the features of the active subduction of the Pacitic plate.
Since late Pliocene,neotectonic movement in the East China Sea has been intensified,and the most obvious features of the neotectonic movement include faults,folds,magmatic intrusion and eruption,seafloor hydrothermal activities,and coastal changes,etc.The neotectonic movement is characteriged by vertical large-scale block-faulting,in an oscillating and episodic manner.Regional difference of neotectonic movement is apparent and shows continuity to cerlain extent in some areas.Meantime,the neotectonic movement occurs in NE(or NEE)～NNE direction along the continent margin,and includes two parts:the eastern belt along the Okinawa Trough and the western belt along the western border of the East China Sea shelf,which extends from—Shanghai,to Zhejiang,Fujian,and Guangdong offshore regions.A tranquil zone of neotectonic movement occurs between the two belts.Neotectonic movement is mainly characterized by faulting,seismic activities,and large-amplitude block-faulting in the western belt;but more intensified in the eastern belt.It includes not only faulting,frequently earthgualce activities,and large-amplitude block-faulting,but also folding,large-scale intrusion and eruption of magmatic rocks,and seafloor hydrothermal activities.Intensive neotectonic movement in the East China Sea owes its origin to the intensitied trough extension in Quaternary,as one of the features of the active subduction of the Pacitic plate.
引文
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[14]木崎甲子郎.琉球群岛的地史.日刊《海洋科学》,1976,8(1):11-16.[Kizaki Kanero.Geological history of the Ruykyu Ridge.Japan[J].Marine Science,1976,8(1):11-16.]
[15]杨怀仁,陈西庆.中国东部第四纪海面升降、海侵海退与岸线变迁[J].海洋地质与第四纪地质,1985.,5(4):59-79.[YANG Huairen,CHEN Xiging.Quaternary Transgres-sions,eustatic changes and shoreline in East China[J].Ma-rine Geology&Quaternary Geology,1985.,5(4):59-79.]
[2]王舒畋,李斌.长江口海域第四纪断层与新构造活动[J].海洋地质与第四纪地质,2009,29(1):51-58.[WANG Shutian,LI Bin.Quaternary Faults and Neotectonic Movement In the Changjiang Estuary[J].Marine Geology&Quaternary Geology,2009,29(1):51-58.]
[3]李斌,王舒畋.平潭岛外—乌丘屿段滨海断裂活动性分析[J].上海地质,2008,(4):30-33.[LI Bin,WANG Shutian,et al.Activity of the BinHai Fault Zone between the PingTan Island and the WuQiu Island[J].Shanghai Geology,2008,(4):30-33.]
[4]王耀东,丁祥焕,许东亚.闵东南大陆边缘活动断裂与地震[J].台湾海峡,1988,7(3):268-274.[WANG Yaodong,DING Xianghuan,XU Dongya.Active faults in Southeast continen-tal border of FuJian and earthquakes[J].Journal of Oceanogra-phy in Taiwan Strait,1988,7(3):268-274.]
[5]毕福志.福建中段海岸带的新构造及其波浪运动的基本特征[J].西安地质学院报,1984,9(1):27-33.[BI Fuzhi.Basic characteristics of the neotectonic and crust-wave movement in the Central FuJian Coastal Zone[J].Journal of Xi’An Geological University,1984,9(1):27-33.]
[6]小西健二,须藤.从琉球到台湾[J].日刊《科学》,1972,42(4):221-230.[Kenji Konishi,et al.From the Ruykyu to the Tai-wan[J].Japan,Science,1972,42(4):221-230.]
[7]杨智娴.海峡两岸地震目录中台湾地震等级之异同[J].地震学报,1999,21,(6):37-44.[YANG Zhixian.The Differences be-tween magnitudes of Taiwan earthquakes from catalogs of Tai-wan and Beijing[J].ACTA Seismologica Sinica,1999,21,(6):37-44.]
[8]丁祥焕,陈玉成.泉州—汕头地震带晚更新世以来断裂活动性与地震关系[J].台湾海峡,1983,2(1):71-81.[DING Xiang-huan,CHEN Yucheng.The relationship between fracture ac-tivity and earthquake in Quanzhou-santou seismic belt since Late Pleistocene[J].Journal of Oceanography In TaiwanStrait,1983,2(1):71-81.]
[9]陈园田.新构造差异运动与泉州海外8级地震[J].地震,1984,(1):49-54.[CHEN Yuantian.Differential neotectonic movement and the Quanzhou offshore earthquake of M8[J].Earthquake,1984,(1):49-54.]
[10]王耀东,丁祥焕.福建东南部近岸海域断裂与地震.海洋地质与第四纪地质,1980,(3)49-54.[WANG Yaodong,DING Xianghuan.Offshore faults and earthquakes in south-east Fu-Jian.Marine Geology&Quaternary Geology,1980,(3):49-54.]
[11]栾锡武.琉球沟弧盆系的海底热流分布特征及冲绳海槽热流演化的数学模拟[J].海洋与湖沼,1997,28(1):44-48.[LU-AN Xiwu.Study of heat flow distributton of Ryukyu TA-B-A systerm and thermo dynamic modeling of Okinawa Though[J].Oceanologia Et Limnologia Sinica,1997,28(1):44-48.]
[12]栾锡武.热液活动区数目和洋脊扩张速率的关系及其在冲绳海槽的应用[J].海洋地质与第四纪地质,2006,26(2):55-64.[LUAN Xiwu.Relationship between the number of hydro-thermal activity fields and spreading rate and its application in the Okinawa Though[J].Marine Geology&Quaternary Ge-ology,2006,26(2):55-64.]
[13]侯增谦.岩浆热液对冲绳海槽海底成矿热水系统的可能贡献[J].地质学报,1999,73(1):51-58.[HOU Zengqian.Possible contribution of magmatic fluids to seafloor ore-forming hydro-thermal system in the Okinawa Trough[J].Acta Geologica Sinica,1999,73(1):51-58.]
[14]木崎甲子郎.琉球群岛的地史.日刊《海洋科学》,1976,8(1):11-16.[Kizaki Kanero.Geological history of the Ruykyu Ridge.Japan[J].Marine Science,1976,8(1):11-16.]
[15]杨怀仁,陈西庆.中国东部第四纪海面升降、海侵海退与岸线变迁[J].海洋地质与第四纪地质,1985.,5(4):59-79.[YANG Huairen,CHEN Xiging.Quaternary Transgres-sions,eustatic changes and shoreline in East China[J].Ma-rine Geology&Quaternary Geology,1985.,5(4):59-79.]
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