Heterogeneous mantle source compositions for boninite from Bonin and Troodos, evidence from iron isotope variations

doi:10.1016/j.lithos.2023.107214

IOCAS-IR > 海洋地质与环境重点实验室

	Heterogeneous mantle source compositions for boninite from Bonin and Troodos, evidence from iron isotope variations
	Xiao, Yuanyuan 1,2,3; Yao, Yongxiang 1,4; Huang, Zihang 1,4; Li, Yi-Bing 5; Niu, Yaoling 2,6; Ishii, Teruaki 7; Sun, Ziwei 1; Gong, Hongmei 1; Wang, Xiaohong 1
	2023-09-01
发表期刊	LITHOS
ISSN	0024-4937
卷号	452 页码:10
通讯作者	Xiao, Yuanyuan([email protected]) ; Li, Yi-Bing([email protected])
摘要	Boninite has been widely accepted to be the melting product of highly refractory mantle with the addition of slab-derived fluids. Previous studies have found that boninite, like other subduction-related magmas (e.g., mature arc basalts), has generally consistent chondrite-like iron isotope composition (c. +0.03%o), which is on average lighter than those of oceanic basalts. However, it remains unclear whether the lighter iron isotope composition of subduction-related magmas is inherited from the depleted mantle source or caused by the addition of slab-derived oxidized fluids. Moreover, boninite has highly varied element patterns (e.g., Yb, Zr), reflecting varying degrees of mantle depletion and different contributions of slab-derived fluids. Given the limited data for iron isotope composition of boninite so far available, it is thus required to systematically study iron isotope composition of boninite with different compositions to further understand the petrogenesis of boninite and the iron isotope variation of subduction-related magmas. Here we report iron isotope compositions of boninite from two classic suites on Earth, i.e., those from Bonin islands and submarine forearc (low-Ca boninite; CaO/Al2O3 mainly <0.75) and Troodos ophiolite complex, Cyprus (high-Ca boninite: CaO/Al2O3 = c. 0.85). The 856Fe values of the Bonin boninite vary from -0.046 & PLUSMN; 0.003%o to +0.078 & PLUSMN; 0.031%o (2SD, SD = standard deviation of 4 times repeated analysis; with an average of +0.03 & PLUSMN; 0.03%o, n = 14). The 856Fe value of the Troodos boninite is relatively constant, i.e., from +0.046 & PLUSMN; 0.010%o to +0.091 & PLUSMN; 0.016%o with an average of +0.06 & PLUSMN; 0.01%o (n = 7). Bonin forearc basalts (FAB) were also analyzed for comparison with 856Fe of -+0.10%o, except for those FABs with higher Th/U ratio and Cu contents (856Fe = +0.01- 0.05%o). Together with previously reported 856Fe data for boninite from New Caledonia (low-Ca boninite with CaO/Al2O3 = - 0.4, 856Fe = - +0.03%o), the lower 856Fe values of the Bonin boninite than Bonin FAB and Troodos boninite reflect the lighter iron isotope composition of the more depleted mantle source. Based on relationships between different indicators for various fluids (e.g., Ba/La, Zr/Sm) and modeling, Bonin boninite is likely produced by partial melting of the refractory mantle with an addition of -5-10% melts from sediments and oceanic crust, while the formation of Troodos boninite can be ascribed to the melting of less refractory mantle, which has been previously metasomatized by -5% fluids derived from oceanic crust and sediments.
关键词	Boninite Iron isotope Subduction Refractory mantle Fluids
DOI	10.1016/j.lithos.2023.107214
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41776069]; Science and Technology Innovation Project of Laoshan Laboratory[LSKJ202204104]; Special project of strategic leading science and technology of Chinese Academy of Sciences[XDB42020302]; Taishan Scholars Program; China Geological Survey[DD20190358]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001014585500001
出版者	ELSEVIER
WOS关键词	SUBDUCTION ZONES ; MELT INCLUSIONS ; MARIANA ARC ; FRACTIONATION ; OPHIOLITE ; CRUST ; ND ; BASALTS ; LAVAS ; GEOCHEMISTRY
引用统计	被引频次：1[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/337002/182353
专题	海洋地质与环境重点实验室
通讯作者	Xiao, Yuanyuan; Li, Yi-Bing
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Laoshan Lab, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Beijing, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 6.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China 7.Shizuoka Univ, Ctr Integrated Res & Educ Nat Hazards, Shizuoka 4228529, Japan
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Xiao, Yuanyuan,Yao, Yongxiang,Huang, Zihang,et al. Heterogeneous mantle source compositions for boninite from Bonin and Troodos, evidence from iron isotope variations[J]. LITHOS,2023,452:10.
APA	Xiao, Yuanyuan.,Yao, Yongxiang.,Huang, Zihang.,Li, Yi-Bing.,Niu, Yaoling.,...&Wang, Xiaohong.(2023).Heterogeneous mantle source compositions for boninite from Bonin and Troodos, evidence from iron isotope variations.LITHOS,452,10.
MLA	Xiao, Yuanyuan,et al."Heterogeneous mantle source compositions for boninite from Bonin and Troodos, evidence from iron isotope variations".LITHOS 452(2023):10.