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Identification of the Caroline Plate boundary:constraints from magnetic anomaly

Acta Oceanologica Sinica 2024年第8期43卷 1-12页

作者： Yongtao Fu Guoliang Zhang Wanyin Wang An Yang Tao He Zhangguo Zhou Xiao Han Key Laboratory of Ocean Observation and Forecasting/Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China National Engineering Research Center for Offshore Oil and Gas Exploration Beijing 100028China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao 266071China Institute of Gravity and Magnetic Technology Key Laboratory of Western China’s Mineral Resources and Geological Engineering of Ministry of EducationSchool of Geology Engineering and GeomaticsChang’an UniversityXi’an 710054China University of Chinese Academy of Sciences Beijing 100049China

The Caroline Plate is located among the Pacific Plate,the Philippine Sea Plate,and the India Australia Plate,and plays a key role in controlling the spreading direction of the Philippine Sea *** Caroline Submarine Plateau(or Caroline Ridge)and the eauripik rise on the south formed a remarkable T-shaped large igneous rock province,which covered the northern boundary between the Caroline Plate and the Pacific ***,relationship between these tectonic units and magma evolution remains *** on magnetic data from the Earth Magnetic Anomaly Grid(2-arc-minute resolution)(V2),the normalized vertical derivative of the total horizontal derivative(NVDR-THDR)technique was used to study the boundary of the Caroline *** show that the northern boundary is a transform fault that runs 1400 km long in approximately 28 km wide along the N8°in E-W *** eastern boundary is an NNW-SSE trending fault zone and subduction zone with a width of tens to hundreds of kilometers;and the north of N4°is a fracture zone of dense *** southeastern boundary may be the Lyra *** area between the southwestern part of the Caroline Plate and the Ayu Trough is occupied by a wide shear zone up to 100 km wide in nearly S-N trending in *** eauripik transform fault(ETF)in the center of the Caroline Plate and the fault zones in the east and west basins are mostly semi-parallel sinistral NNW-SSE–trending faults,which together with the eastern boundary Mussau Trench(MT)sinistral fault,the northern Caroline transform fault(CTF),and the southern shear zone of the western boundary,indicates the sinistral characteristics of the Caroline *** Caroline hotspot erupted in the Pacific Plate near the CTF and formed the west Caroline Ridge,and then joined with the Caroline transform fault at the N8°.A large amount of magma erupted along the CTF,by which the east Caroline Ridge was *** the same time,a large amount of magma developed southward via the e

关键词： Caroline Plate magnetic anomaly normalized vertical derivative of the total horizontal derivative plate boundary Caroline Ridge eauripik rise

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