The eruption of large igneous provinces usually has major geodynamic influences on overrid-ing plates.Seamount chains indicate that the drifting direction of the Pacific Plate changed by～80° in the Early Cretaceous when the Ontong Java Plateau formed.This,however,is not fully consistent with the mag-netic anomalies.Here we show that there is an angle of～25° between the magnetic anomaly lines M0 and 34 of both the Japanese and the Hawaiian lineations,suggesting that the orientations of both spreading ridges changed by roughly the same angle towards the same direction.The configurations of the Shatsky Rise,the Papanin Ridge and the Osbourn Trough suggest that the eruption of the Ontong Java plume head uplifted the southeastern corner of the Pacific Plate,and pushed its east part northward by～700 km within 2 Ma.Meanwhile,the west part of the Pacific Plate was subducting southwestward underneath the eastern Asian Continent.These two forces together rotated the Pacific Plate anticlockwisely by ca 50°.Consequently,the drifting direction of the Pacific Plate also changed from south westward to northwestward,which plausibly explains the ca 80° bending of the Shatsky Rise and the Papanin Ridge.The ridge between the Pacific and the Izanagi/Kula plates was pointed towards the～300° orientation,whereas the Pacific Plate was subducting towards the～250° orientation before～125 Ma,and towards～280° afterward.

Weidong Sun;Lipeng Zhang;Xi Liu

Center of Deep Sea Research,Institute of Oceanology,Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;School of Marine Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

地球科学学刊（英文版）

[1]Weidong Sun;Lipeng Zhang;Xi Liu-.The Rotation of the Pacific Plate Induced by the Ontong Java Large Igneous Province)[J].地球科学学刊（英文版）,2022(03):544-551

Ontong,overrid,Seamount,lineations,Shatsky,Papanin,Osbourn,anticlockwisely,Izanagi,Kula

Rotation,Pacific,Induced,by,Java,Large,Igneous,Province,eruption,large,igneous,provinces,usually,has,major,geodynamic,influences,plates,chains,indicate,that,drifting,direction,changed,Early,Cretaceous,when,Plateau,formed,This,however,not,fully,consistent,anomalies,Here,show,there,angle,between,magnetic,anomaly,lines,M0,both,Japanese,Hawaiian,suggesting,orientations,spreading,ridges,roughly,same,towards,configurations,Rise,Ridge,Trough,plume,head,uplifted,southeastern,corner,pushed,its,part,northward,within,Ma,Meanwhile,was,subducting,southwestward,underneath,Asian,Continent,These,two,forces,together,rotated,Consequently,also,from,northwestward,which,plausibly,explains,bending,pointed,whereas,before,afterward

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