Tectonics of the Solomon Sea Basin from Vertical Gravity Gradient and Seismic Data  

作　　者：GONG Wei XING Junhui MENG Qingwei XING Lei XU Chong ZHANG Hao 

机构地区：[1]Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,and College of Marine Geosciences,Ocean University of China,Qingdao,Shandong 266100,China [2]Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao,Shandong 266237,China [3]Chinese Academy of Geological Sciences,Beijing 100037,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第2期610-622,共13页地质学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.91858215 and 41906048)。

摘　　要：The Solomon Sea Basin is a Cenozoic back-arc spreading basin within the convergence system of the Pacific and Indo-Australian plates.Against the background of subduction polarity reversal,the current Solomon Sea Basin gradually formed a rhombic morphology with the subduction of the basin along the New Britain Trench and the Trobriand Trough.By analyzing the vertical gravity gradient,natural earthquake and seismic reflection data,this study determines the structural characteristics of the Solomon Sea Basin.It was found that the tectonics of the basin are characterized by the original expansion structure within the central part in addition to the structure induced by the latest subduction along the basin margin.The original spreading structure of the basin presented an east–west linear graben and horst controlled by normal faults during the basin expansion period.As a result of the subduction and slab-pull of the Solomon Sea Basin,extensional structure belts parallel to the New Britain Trench formed along the basin margin.

关 键 词：vertical gravity gradient seismic data TECTONICS New Britain Trench Solomon Sea Basin 

分 类 号：P736[天文地球—海洋地质] P631[天文地球—海洋科学]