摘要
开合构造是研究地球开合运动及其构造特征,分析开合构造体系的形成机制,探索地球成因和演化的一种新假说。不同时空尺度的开合构造在地学上存在不同的表现,需要从不同角度开展研究。以亚欧非邻区巨型开合构造区、地中海大型开合构造区、东大别中型开合构造区为例,研究了开合构造理论在大地构造分区、地震活动以及现代大地测量结果解释等方面的应用。研究表明:(1)依据开合构造观点可将亚欧非邻区巨型开合构造划分为俄罗斯构造集群、非洲构造集群、北亚构造集群、中亚构造集群、南亚构造集群及东亚构造集群;(2)亚欧非邻区的强地震活动与构造集群间的新生代开合构造转换带关系密切;(3)地中海大型开合构造区内的地震剖面及震源机制揭示了地中海-土耳其-伊朗-阿富汗构造转换带现今构造运动主要以合为主;(4)东大别中型开合构造周边的狮子山、黄梅、麻城等台站的地倾斜和地应变、周边GNSS和流动重力观测结果揭示了该区周边存在时间尺度较短、量级较弱的由"合"向"开"的趋势转变,开合运动是近期诸多观测数据趋势出现准同步性变化的共同机理。
"Opening-closing"tectonics is a new hypothesis for studying the opening and closing movements and evolution of the earth.Different spatiotemporal opening-closing tectonics have different geological features that need to be studied from different perspectives.In this paper,we demonstrated the applications of opening-closing tectonic theory in geotectonic division,seismic activity and interpreting modern geodesy results,by the examples of large opening-closing tectonic zones in the Mediterranean and medium sized in the eastern Dabie orogenic belt.The results showed that(1)the bordering regions of Asia,Europe and Africa can be divided into six tectonic assemblages:Russian,African and North,Central,South and East Asian tectonic assemblages;(2)earthquakes in the bordering regions are mainly distributed in Cenozoic opening-closing tectonic transition zones between tectonic assemblages;(3)the seismic profile and focal mechanism study indicated that the current tectonic movement in the Mediterranean-Turkey-IranAfghanistan tectonic transition zone is dominated by"closing"motion;and(4)modern crustal deformation observations around the eastern Dabie orogenic belt,such as ground tilt and strain in the Shizishan,Huangmei and Macheng areas,and observations from GNSS and mobile gravity surveys in the area,indicate a low tendency for tectonic evolution from"closing"to "opening"on a short time scale,suggesting the"opening-closing"movement can be a common mechanism for some correlated tectonic events occurred simultaneously in the region.
作者
王杰
吴海波
鲁小飞
李献瑞
WANG Jie;WU Haibo;LU Xiaofei;LI Xianrui(Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan 430071,China;Hubei Earthquake Agency,Wuhan 430071,China;School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2020年第1期260-269,共10页
Earth Science Frontiers
基金
中国地震局地震科技星火计划(XH18031YSX)
中国地震局所长基金课题(IS201556231)。
关键词
大地构造分区
开合构造
地震
地壳形变观测
大别造山带
tectonic division
opening-closing tectonic
earthquake
crustal deformation observation
Dabie orogenic belt
