Petrological and geochemical constraints of mantle peridotites on the magma-starved Yap Arc formed by ultra-slow subduction

doi:10.1007/s00410-023-02056-2

	Petrological and geochemical constraints of mantle peridotites on the magma-starved Yap Arc formed by ultra-slow subduction
	Yao, Junhua 1,2; Zhang, Guoliang 1,2; Zhang, Ji 1,2; He, De-Feng 3
	2023-11-01
发表期刊	CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN	0010-7999
卷号	178 期号:11 页码:17
通讯作者	Zhang, Guoliang([email protected])
摘要	Oceanic plateaus inevitably interact with trench-arc systems during oceanic subduction, but the subduction mechanisms are poorly understood. The Yap trench-arc system is an important part of the western Pacific subduction zone, and is undergoing ultra-slow subduction of the Caroline Plateau. As such, it is ideal for investigating the magmatic-tectonic processes of oceanic plateau subduction. In this study, we document the mineralogy and geochemistry of serpentinized peridotites from the Yap-Mariana Junction. These peridotites can be subdivided into two groups. Group I samples have intermediate to high whole-rock CaO contents and Al2O3/SiO2 values, low chromite Cr# (as low as 0.16) and high chromite Ga/Fe3+# values, and low pyroxene Mg# values relative to Mariana Forearc peridotites. These features are consistent with those of abyssal peridotites. Based on La/Sm ratios, two types of clinopyroxene are identified in group 1 samples. Melting models show that the light rare earth element (LREE)-depleted patterns of type 1 clinopyroxene can be produced by similar to 5% fractional melting or similar to 6% open-system melting of depleted upper mantle, while the nearly flat REE patterns of type 2 clinopyroxene are related to LREE-enriched melts. These clinopyroxene compositions record melt impregnation and reactions in the mantle beneath the Yap-Mariana Junction. In contrast, group 2 samples have similar compositions to forearc peridotites, such as low whole-rock Al2O3/SiO2 values, and high chromite Cr# (up to 0.73) and low chromite Ga/Fe3+# values. The different trends in plots of chromite Cr#-TiO2 and 100Ti/Fe3+#-Ga/Fe3+# indicate that the group 1 samples experienced reactions with mid-ocean ridge basalt-like melts, whereas the group 2 samples experienced reactions with island arc tholeiite-like melts. The Mg#, TiO2, and Al2O3 values of the melts in equilibrium with chromite in the group 1 samples are consistent with those of the Parece Vela Basin basalts, while those from group 2 samples define a compositional trend similar to arc-related volcanic rocks. Therefore, this region experienced a tectonic transition from a back-arc spreading ridge to a subduction zone. Compared with the Mariana Trench that is undergoing normal oceanic crustal subduction, the absence of volcanic rocks at the Yap Trench are the response to ultra-slow subduction of the Caroline Plateau.
关键词	Ultra-slow subduction Oceanic plateau subduction Mantle peridotites Mineralogy Magma-starved Yap Arc
DOI	10.1007/s00410-023-02056-2
收录类别	SCI
语种	英语
资助项目	NSFC Shiptime Sharing Project[NORC2020-581]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302]; National Natural Science Foundation of China[91858206]; National Natural Science Foundation of China[42221005]; National Natural Science Foundation of China[42206051]; Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao)[2022QNLM050201-3]; Natural Science Foundation of Shandong Province[ZR2020MD070]; Natural Science Foundation of Shandong Province[ZR2022QD027]; Taishan Scholars Program of Shandong Province[tsqn201909157]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001084318600001
出版者	SPRINGER
WOS关键词	MARIANA FORE-ARC ; OCEANIC PLATEAUS ; TRACE-ELEMENTS ; CHROMIAN SPINEL ; MELT INCLUSIONS ; ABYSSAL ; BENEATH ; ORIGIN ; OPHIOLITE ; EVOLUTION
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/181632
专题	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.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China
第一作者单位	深海极端环境与生命过程研究中心
通讯作者单位	深海极端环境与生命过程研究中心
推荐引用方式 GB/T 7714	Yao, Junhua,Zhang, Guoliang,Zhang, Ji,et al. Petrological and geochemical constraints of mantle peridotites on the magma-starved Yap Arc formed by ultra-slow subduction[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2023,178(11):17.
APA	Yao, Junhua,Zhang, Guoliang,Zhang, Ji,&He, De-Feng.(2023).Petrological and geochemical constraints of mantle peridotites on the magma-starved Yap Arc formed by ultra-slow subduction.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,178(11),17.
MLA	Yao, Junhua,et al."Petrological and geochemical constraints of mantle peridotites on the magma-starved Yap Arc formed by ultra-slow subduction".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 178.11(2023):17.

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