摘要
北伊里安盆地位于澳大利亚板块与太平洋板块的汇聚挤压边缘,自晚白垩世开始,澳大利亚板块不断向北移动,与太平洋板块发生多次挤压碰撞,形成了构造活动复杂区域,由此为盆地北缘海底形成广泛滑坡提供基础。通过分析盆地北部高精度的二维地震资料,对海底滑坡特征进行了详细刻画,识别出海底滑坡的3个构造单元:头部、体部和趾部,不同部位都具有其典型的地震特征。该区域海底滑坡广泛发育,分为陆坡/陆架滑坡、水道壁滑坡、峡谷滑坡和块体流沉积4种类型。结合该盆地的区域地质背景,认为板块之间的俯冲碰撞等构造运动对海底滑坡起了主要控制作用,在海底地形坡度作为内因和沉积物供给速率、海平面变化、地震活动等外界因素的共同作用下诱发海底滑坡。
The North Irian Basin is located at the convergence and compression edges of the Australian and Pacific plates.Since the Late Cretaceous,the Australian Plate has been moving northward,and collision with the Pacific Plate has occurred several times,forming a complex area of tectonic activity.This provides a foundation for the formation of extensive landslides on the seafloor in the northern margin of the basin.By analyzing the high precision 2D seismic data in the north of the basin,the characteristics of submarine landslides are described in detail.Three structural units of a submarine landslide,namely the headwall domain,translation domain,and toe domain,are identified,which have their typical seismic characteristics.Submarine landslides are widespread in this area and can be divided into four types:continental slope/shelf,channel wall,valley,and Mass Transport Deposits(MTDs).Combined with the regional geological background of the basin,it is considered that the tectonic movement of subduction and collision between plates plays a major role in controlling submarine landslides,which is induced by the combined action of external factors such as the submarine terrain slope as the internal cause,the sediment supply rate,sea-level change,and seismic activity.
作者
胡庆
栾锡武
冉伟民
魏新元
王嘉
叶传红
韦明盟
龚梁轩
刘泽璇
HU Qing;LUAN Xiwu;RAN Weimin;WEI Xinyuan;WANG Jia;YE Chuanhong;WEI Mingmeng;GONG Liangxuan;LIU Zexuan(College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;College of Marine Science and Technology,China University of Geosciences(Wuhan),Wuhan 430074,China;School of Earth Sciences,Northeast Petroleum University,Daqing Heilongjiang 163318,China)
出处
《地球科学进展》
CAS
CSCD
北大核心
2022年第3期303-315,共13页
Advances in Earth Science
基金
中国—东盟海上合作基金项目“中国—东盟海洋地震数据平台与研究中心建设”(编号:12120100500017001)
国家自然科学基金项目“孟加拉湾东北部沉积过程与特提斯东段构造变形耦合关系”(编号:92055211)资助。
关键词
北伊里安盆地
挤压碰撞
海底滑坡
地震特征
构造运动
The North Irian Basin
Extrusion and collision
Submarine landslide
Seismic characteristics
Tectonic movement
