Structural features in the mid-southern section of the Kyushu–Palau Ridge based on satellite altimetry gravity anomaly  

作　　者：Feifei Zhang Dingding Wang Xiaolin Ji Fanghui Hou Yuan Yang Wanyin Wang 

机构地区：[1]School of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China [2]Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China [3]Information and Navigation College,Air Force Engineering University,Xi’an 710077,China [4]National Engineering Research Center of Offshore Oil and Gas Exploration,Beijing 100028,China [5]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

出　　处：《Acta Oceanologica Sinica》2024年第4期50-60,共11页海洋学报（英文版）

基　　金：‘Research on Deep Structural Differences between Potential Oil-rich Depressions in Offshore basins of China Sea’from the scientific and technological project of CNOOC Research Institute Co.,Ltd.,under contract No.CCL2021RCPS0167KQN;‘Resource Potential,Accumulation Mechanism and Breakthrough Direction of Potential Oil-rich Depressions in Offshore China Sea’,under contract No.220226220101;the Project of China Geological Survey under contract No.DD20191003;the National Natural Science Foundation of Shandong Province of China under contract No.ZR2022MD047。

摘　　要：The Kyushu–Palau Ridge(KPR),an anti-S-shaped submarine highland at the center of the Philippine Sea Plate(PSP),is considered the residual arc of the Izu–Bonin–Mariana Island Arc,which retains key information about the cessation of the Western Philippine Basin(WPB)expansion and the Parece Vela Basin(PVB)breakup.Herein,using the new generation of satellite altimetry gravity data,high-precision seafloor topography data,and newly acquired ship-borne gravity data,the topographic and gravity characteristics of the KPR mid-southern section and adjacent region are depicted.The distribution characteristics of the faults were delineated using the normalized vertical derivative–total horizontal derivative method(NVDR-THDR)and the minimum curvature potential field separation method.The Moho depth and crustal thickness were inverted using the rapid inversion method for a double-interface model with depth constraints.Based on these results,the crust structure features in the KPR mid-southern section,and the“triangular”structure geological significance where the KPR and Central Basin Rift(CBR)of the WPB intersect are interpreted.The KPR crustal thickness is approximately 6–16 km,with a distinct discontinuity that is slightly thicker than the normal oceanic crust.The KPR mid-southern section crust structure was divided into four segments(S1–S4)from north to south,formed by the CBR eastward extension joint action and clockwise rotation of the PVB expansion axis and the Mindanao fault zone blocking effect.

关 键 词：structural features satellite altimetry gravity data Kyushu-Palau Ridge Central Basin Rift FAULTS Moho depth 

分 类 号：P618.13[天文地球—矿床学] P631.1[天文地球—地质学]