Density Structure of the Papua New Guinea-Solomon Arc Subduction System  

作　　者：XU Chong XING Junhui GONG Wei ZHANG Hao XU Haowei XU Xiaoyu 

机构地区：[1]Key Laboratory of Submarine Geosciences and Prospecting Techniques,MOE and College of Marine Geosciences,Ocean University of China,Qingdao 266100,China [2]Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China [3]QiLu Research Institute,Aerospace Information Research Institute Chinese Academy of Sciences,Jinan 250002,China

出　　处：《Journal of Ocean University of China》2023年第5期1269-1276,共8页中国海洋大学学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.91858215,42076224)。

摘　　要：The Papua New Guinea-Solomon(PN-SL)arc is one of the regions with active crustal motions and strong geological actions.Thus,its complex subduction system makes it an ideal laboratory for studying the initiation mechanism of plate subduction.However,the PN-SL subduction system has not yet been sufficiently studied,and its density structure has yet to be revealed.In this paper,we used the free-air gravity data,Parker-Oldenburg density surface inversion method,and the genetic algorithm density inversion method to obtain the density structure of an approximately 1000-km-long northwest-southeast line crossing the PN-SL subduction system under the constraints of the CRUST1.0 global crustal model,onshore seismic data,and the LLNL-G3Dv3 global P-wave velocity model.The density structure shows that density differences between the plates on the two sides of the trench could play a significant role in plate subduction.

关 键 词：Papua New Guinea-Solomon plate subduction gravity anomaly density structure genetic algorithm 

分 类 号：P736.1[天文地球—海洋地质]