Origin of the Mussau Trench in the Western Pacific: Geochemical and mineralogical constraints from basalts and serpentinized peridotites

doi:10.1016/j.chemgeo.2023.121798

	Origin of the Mussau Trench in the Western Pacific: Geochemical and mineralogical constraints from basalts and serpentinized peridotites
	Zhang, Guoliang 1,2,3; Yao, Junhua 1; Xu, Feng 1; Wu, Tao 4,5; Li, Chun-Feng 4,5; Wang, Shuai 1,3
	2023-12-30
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	642 页码:17
通讯作者	Zhang, Guoliang(zhangguoliang@qdio.ac.cn)
摘要	The Mussau Trench is apparently an incipient subduction zone. However, petrologic and geochemical evidence for the nature and origin of the Mussau Trench is lacking. We present the first mineralogical and geochemical analyses of basalts and serpentinized peridotites from the Mussau Trench. All sampled Mussau Trench basalts yield MORB-like trace-element patterns and lack the geochemical characteristics of typical arc lavas. The Dupaltype isotopic compositions of the MORB-like lavas confirm that the overriding plate shows more affiliation to the Caroline Plate than to the Pacific Plate. The Mussau Trench could have formed along a pre-existing transform fault in the Caroline Plate. Peridotites from the Mussau Trench are highly serpentinized and can be divided into two groups. Group I peridotites have low MgO/SiO2 ratios and contain talc and quartz, suggesting that they were metasomatized by SiO2-rich fluids. Group II peridotites have higher Al2O3/SiO2 ratios at a given MgO/SiO2 ratio and rarely contain talc or quartz. The peridotites in the Mussau Trench differ from typical fore-arc peridotites in the Mariana Trench; for example, the Mussau peridotites are less depleted in trace elements and have lower spinel Cr# (<0.6) than those from the Mariana Trench, suggesting that they originated in the lithosphere of the Caroline plate. The temperatures (<688 degrees C) and pressures (<7.3 kbar) estimated using amphibole compositions (dominantly edenite and pargasite) suggest that the peridotites were serpentinized by high-temperature slabderived fluids. Although the limited plate convergence at the Mussau Trench was insufficient to cause arc magmatism, subducted slab-derived fluids caused serpentinization of the overriding lithospheric mantle in an infant subduction channel. Therefore, the serpentinized peridotites and basalts in the Mussau Trench provide important information on the marks and processes of intra-oceanic subduction initiation.
关键词	Serpentinized peridotite Subduction channel Subduction initiation Fluids Mussau Trench Caroline Plate
DOI	10.1016/j.chemgeo.2023.121798
收录类别	SCI
语种	英语
资助项目	NSFC Shiptime Sharing Project[41949581] ; 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] ; National Natural Science Foundation of China[42221005] ; National Natural Science Foundation of China[91858213] ; 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
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001108533700001
出版者	ELSEVIER
WOS关键词	MARIANA FORE-ARC ; SUBDUCTION INITIATION ; ABYSSAL PERIDOTITES ; THERMAL ASPECTS ; TRACE-ELEMENT ; MANTLE ; EVOLUTION ; AMPHIBOLES ; FLOOR ; STABILITY
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/183940
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.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Zhejiang Univ, Ocean Coll, Zhoushan 316021, Peoples R China 5.Zhejiang Univ, Hainan Inst, Sanya 572025, 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	Zhang, Guoliang,Yao, Junhua,Xu, Feng,et al. Origin of the Mussau Trench in the Western Pacific: Geochemical and mineralogical constraints from basalts and serpentinized peridotites[J]. CHEMICAL GEOLOGY,2023,642:17.
APA	Zhang, Guoliang,Yao, Junhua,Xu, Feng,Wu, Tao,Li, Chun-Feng,&Wang, Shuai.(2023).Origin of the Mussau Trench in the Western Pacific: Geochemical and mineralogical constraints from basalts and serpentinized peridotites.CHEMICAL GEOLOGY,642,17.
MLA	Zhang, Guoliang,et al."Origin of the Mussau Trench in the Western Pacific: Geochemical and mineralogical constraints from basalts and serpentinized peridotites".CHEMICAL GEOLOGY 642(2023):17.

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