Identification of the Caroline Plate Boundary: Constraints from Magnetic Anomaly

Yongtao Fu Guoliang Zhang Wanyin Wang An Yang Tao He Zhangguo Zhou Xiao Han

Yongtao Fu, Guoliang Zhang, Wanyin Wang, An Yang, Tao He, Zhangguo Zhou, Xiao Han. Identification of the Caroline Plate Boundary: Constraints from Magnetic Anomaly[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2272-9
Citation: Yongtao Fu, Guoliang Zhang, Wanyin Wang, An Yang, Tao He, Zhangguo Zhou, Xiao Han. Identification of the Caroline Plate Boundary: Constraints from Magnetic Anomaly[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2272-9

doi: 10.1007/s13131-023-2272-9

Identification of the Caroline Plate Boundary: Constraints from Magnetic Anomaly

Funds: ‘Open Fund of the Key Laboratory of Marine Geology and Environment’ from Chinese Academy of Sciences, under contract No. MGE2022KG11.
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  • Figure  1.  a. Submarine topography and geological units in the research area. The topography data are from GEBCO Compilation Group (2022) GEBCO_2022 Grid. The magnetic lineation data in the Caroline Basin are from Gaina and Müller (2007). The magnetic lineation in the Pacific Plate is from Zhu et al. (2022). The white dots represent islands in the Federated States of Micronesia. The white dotted line is the presumed boundary between the Caroline Plate and the Pacific Plate. The green dashed line indicates the modeled track of the Caroline hot spot since 25 Ma, based on Wu et al. (2016). AT: Ayu Trough; BS: Bismark Sea; CHS: Caroline Hot Spot; CHST: Caroline Hot Spot Track; CI: Caroline Islands; CP: Caroline Plate; ECB: East Caroline Basin; ECR: East Caroline Ridge; ER: Eauripik Rise; FaiA: Fais Atoll; FarA: Faraulep Atoll; I-AP: Indo-Australian Plate; KT: Kiilsgaard Trough; LT: Lyra Trough; ManT: Manus Trench; MR: Mapia Ridge; MarT: Mariana Trench; MHS: Manus Hot Spot; MusT: Mussau Trench: NGT: New Guinea Trench; PP: Pacific Plate; PT: Palau Trench; PSP: Philippine Sea Plate; ST: Sorol Trough: UA: Ulithi Atoll; WCB: West Caroline Basin; WCR(N): West Caroline Ridge (North); WCR(S): West Caroline Ridge (South); WCT: West Caroline Trough; YT: Yap Trench. The red star indicates the Site CJ09-82 (Yan et al., 2022). The green triangles are dredge hauls by RV Kexue from the Institute of Oceanology, Chinese Academy of Sciences (Zhang et al., 2020). The blue triangles are dredge hauls by the RV “Vema” (hauls D19, D20, and D21) (Fornari et al., 1979). DSDP57 and DSDP62 are from Ian Ridley et al. (1974) and Den et al. (1971), respectively. b. The free air gravity anomaly (satellite altimetry gravity anomaly) mapof the research area. Data are from Sandwell et al. (2021). The names of geological units are the same as Fig.1a.

    Figure  2.  ΔT magnetic anomaly map of the research area. The geological unit names are the same as Fig.1a.

    Figure  3.  The RTP magnetic anomaly in the research area. The geological unit names are the same as Fig.1a.

    Figure  4.  The distribution of the Caroline Plate fault. The yellow-and-green lines are NVDR-THDR of RTP magnetic anomaly. The purple line in the upper right corner is the magnetic lineation recognized by Zhu et al. (2022). CTF: Caroline Transform Fault; DZ: Disruptured zone in the northern section of the eastern boundary of the Caroline Plate; ECBF: NNW trending fault in the East Caroline Basin; LT: Lyra Trough; MusT: Mussau Trench; ETF: Eauripik Transform Fault; NERF: northern Eauripik Rise fault; PPF: NW trending fault zone in the Pacific Plate; STF: Sorol Trough Fault zone; SWSZ: Southwest shear zone; WCBF: Fault zone within the West Caroline Basin.

    Figure  5.  Schematic diagram showing the sinistral movement of the Caroline Plate, the distribution of faults in the research area, and the locations of the West Caroline Ridge, East Caroline Ridge, and Eauripik Rise. The geological unit names are the same as in Fig. 1a, and the fault zone names are the same as in Fig. 4. The light-brown area is the enclosure of 3000 m isobath, which is also the T-shaped large igneous province.

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