Plate convergence in the Indo-Pacific region

IOCAS-IR

	Plate convergence in the Indo-Pacific region
	SUN Weidong; ZHANG Lipeng ; LIAO Renqiang; SUN Saijun ; LI Congying ; LIU He
发表期刊	Journal of Oceanology and Limnology
ISSN	2096-5508
	2020-07-15
出版年	2020
卷号	v.38 期号:04 页码:113-122
文献类型	CNKI期刊论文
摘要	The Indo-Pacific convergence region is the best target to solve the teo remaining challenge s of the plate tectonics theory,i.e.,subduction initiation and the driving force of plate tectonics.Recent studies proposed that the Izu-Bonin subduction initiation belongs to spontaneous initiation,which implies that it started from extension,followed by low angle subduction.Numerical geodynamic modeling suggests that the initiation of plate subduction likely occurred along a transform fault,which put the young spreading ridge in direct contact with old oceanic crust.This,however,does not explain the simultaneous subduction initiation in the west Pacific region in the Cenozoic.Namely,the subduction initiations in the Izu-BoninMariana,the Aleutian,and the Tonga-Kermadec trenches are associated with oceanic crusts of different ages,yet they occurred at roughly the same time,suggesting that they were all triggered by a maj or change in the Pacific plate.Moreover,low angle subduction induces compression rather than extension,which requires external compression forces.Given that the famous Hawaiian-Emperor bending occurred roughly at the same time with the onset of westward subductions in the west Pacific,we propose that these Cenozoic subductions were initiated by the steering of the Pacific plate,which are classified as induced initiation.Induced subduction initiation usually occurs in young ocean basins,forming single-track subduction.The closure s of Neo-Tethys Oceans were likely triggered by plume s in the south,forming northward subductions.Interestingly,the Indian plate kept on moving northward more than 50 Ma after the collision between the Indian and Eurasian continents and the break-off of the subducted oceanic slab attached to it.This strongly suggests that slab pull is not the main driving force of plate tectonics,whereas slab sliding is.
关键词	plate tectonics subduction initiation drifting history Pacific plate Indian plate slab sliding
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A011;
CNKI专题名称	地质学;
分类号	P542
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	Supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (No.XDB42020203,XDB18020102) ; the National Key R&D Program of China (No.2016YFC0600408) ; the Taishan Scholar Program of Shandong (No.TS201712075)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/188144
专题	中国科学院海洋研究所
作者单位	1.CenterofDeepSeaResearch,InstituteofOceanology,CenterforOceanMega-Science,ChineseAcademyofSciences 2.LaboratoryforMarineMineralResources,QingdaoNationalLaboratoryforMarineScienceandTechnology 3.UniversityofChineseAcademyofSciences
推荐引用方式 GB/T 7714	SUN Weidong,ZHANG Lipeng,LIAO Renqiang,et al. Plate convergence in the Indo-Pacific region. 2020.