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structural characteristics of the KPR-CBR triple-junction inferred from gravity and magnetic interpretations,Philippine Sea Plate

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China Geology 2021年第4期4卷 541-552页

作者： Lu-ning Shang Pan-feng Li Run-lin Du Feng-long Bai Gang Hu Wen-chao Lü Xia Li Xi Mei Tian-yu Zhang Hou-zhen Cao Jing-yi Cong Xian-yao Shi Qingdao Institute of Marine Geology China Geological SurveyMinistry of Natural ResourcesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdao 266000China China Geological Survey Ministry of Natural ResourcesBeijing 100037China

The intersection of the Kyushu-Palau Ridge(KPR)and the Central Basin Rift(CBR)of the West Philippine Basin(WPB)is a relic of a trench-trench-rift(TTR)type triple-junction,which preserves some pivotal information on the cessation of the seafloor spreading of the WPB,the emplacement and disintegration of the proto-Izu-Bonin-Mariana(IBM)Arc,and the transition from initial rifting to steady-state spreading of the Parece Vela Basin(PVB).However,the structural characteristics of this triple-junction have not been thoroughly *** this paper,using the newly acquired multi-beam bathymetric,gravity,and magnetic data obtained by the Qingdao Institute of Marine Geology,China Geological Survey,the authors depict the topographic,gravity,and magnetic characteristics of the triple-junction and adjacent *** including the upward continuations and total horizontal derivatives of gravity anomaly are also performed to highlight the major structural features and *** on these works,the morphological and structural features and their formation mechanisms are *** results show that the last episode amagmatic extension along the CBR led to the formation of a deep rift valley,which extends eastward and incised the *** morphological and structural fabrics of the KPR near and to the south of the triple-junction are consistent with those of the western PVB,manifesting as a series of NNE-SSW-and N-S-trending ridges and troughs,which were produced by the extensional faults associated with the initial rifting of the *** superposition of the above two reasons induced the prominent discontinuity of the KPR in deep and shallow crustal structures between 15°N‒15°30′N and 13°30′N‒14°*** with previous authors’results,we propose that the stress produced by the early spreading of the PVB transmitted westward and promoted the final stage amagmatic extension of the *** eastward propagation of the CBR destroyed the KPR,of which the magmatis

关键词： Kyushu-Palau Ridge Central Basin Rift Tecto-morphological features Gravity and magnetic anomalies Back-arc spreading structural discontinuities Philippine Sea Plate Marine scientific survey

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