Abstract
We have identified Late Jurassic to Early Cretaceous magnetic anomaly lineations (M0 to M35 of the Japanese and Hawaiian lineation sets) and fracture zones in the northwestern Pacific more comprehensively than previous investigators. We fixed 3500 positions of magnetic anomalies identified from magnetic data collected along cruise tracks as well as 151 positions of fracture zones from bathymetric and seismic profiles. The resultant isochron map revealed the evolution of the triple junction of the Pacific, Izanagi, and Farallon plates and the intimate relationship between the triple junction and the origin of the Shatsky Rise. The triple junction stagnated on a hotspot (the Shatsky hotspot) from chron M21 (149.5 Ma) to chron M4 (126 Ma). The Shatsky Rise is a trace of the hotspot on the Pacific plate. A sudden appearance of the Shatsky hotspot between chrons M21 and M20 caused a regional reorganization of the Pacific‐Izanagi‐Farallon plate boundaries.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
