Geochemical and Chronological Constraints on the Origin and Mantle Source of Early Cretaceous Arc Volcanism on the Gagua Ridge in Western Pacific

doi:10.1029/2022GC010424

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	Geochemical and Chronological Constraints on the Origin and Mantle Source of Early Cretaceous Arc Volcanism on the Gagua Ridge in Western Pacific
	Zhang, Guoliang 2,3,4; Zhang, Ji 2,4; Dalton, Hayden 1; Phillips, David 1
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2022-09-01
卷号	23 期号:9 页码:19
关键词	subduction zone sub-arc mantle sediment melt Early Cretaceous Gagua Ridge western Pacific
DOI	10.1029/2022GC010424
通讯作者	Zhang, Guoliang(zhangguoliang@qdio.ac.cn)
英文摘要	The modern western Pacific basins and arcs formed during the Cenozoic are considered to be underlain by Indian-type asthenospheric mantle. Nevertheless, Mesozoic volcanic arcs are rare in the western Pacific, and as a result, the nature of the mantle source and subduction history in the western Pacific remains unclear. The Gagua Ridge constitutes the western boundary of the Philippine Sea Plate; however, its geologic nature and genesis are unclear. Here, we determine whole-rock major and trace elements and Sr-Nd-Pb-Hf-Mg isotopic compositions and emplacement ages of the volcanic rocks from the Gagua Ridge. These rocks are classified as trachy-andesites and basaltic andesites. They are characterized by depletion in Nb-Ta and enrichment in large ion lithosphile elements, confirming their arc affinity. Ar-40-Ar-39 analyses of plagioclase yields ages of 124-123 Ma for the basaltic andesite group and similar to 115 Ma for the trachy-andesite group. The elevated Zr-Hf-K of these rocks coupled with high Th/La ratios indicate melting of subducted sediments. The anomalously high Nb/Ta (mean similar to 33) can be explained by slab melting with residual rutile. These rocks also show the highest delta Mg-26 (-0.14 to 0.4 parts per thousand) for arc lavas ever reported and the delta Mg-26 values are coupled with rare earth element compositions, which can be explained by interaction of sediment melts with altered peridotite/altered oceanic crust in the subduction zone. These volcanic rocks have Nd-Hf isotopes similar to the Pacific mantle, indicating the presence of Pacific-type mantle in the Early Cretaceous western Pacific.
资助项目	Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao)[2022QNLM050201-3] ; National Natural Science Foundation of China[91858206] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050101] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302] ; Taishan Scholars Program of Shandong Province[tsqn201909157]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000861190600001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/180690]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Zhang, Guoliang
作者单位	1.Univ Melbourne, Sch Geog Earth & Atmospher Sci, Parkville, Vic, Australia 2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Guoliang,Zhang, Ji,Dalton, Hayden,et al. Geochemical and Chronological Constraints on the Origin and Mantle Source of Early Cretaceous Arc Volcanism on the Gagua Ridge in Western Pacific[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2022,23(9):19.
APA	Zhang, Guoliang,Zhang, Ji,Dalton, Hayden,&Phillips, David.(2022).Geochemical and Chronological Constraints on the Origin and Mantle Source of Early Cretaceous Arc Volcanism on the Gagua Ridge in Western Pacific.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,23(9),19.
MLA	Zhang, Guoliang,et al."Geochemical and Chronological Constraints on the Origin and Mantle Source of Early Cretaceous Arc Volcanism on the Gagua Ridge in Western Pacific".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 23.9(2022):19.