Trace Elements and Li Isotope Compositions Across the Kamchatka Arc: Constraints on Slab-Derived Fluid Sources

doi:10.1029/2019JB019237

	Trace Elements and Li Isotope Compositions Across the Kamchatka Arc: Constraints on Slab-Derived Fluid Sources
	Liu, Haiyang 1,2,3,4; Xiao, Yilin 1,5; Sun, He 1,6; Tong, Fengtai 1; Heuser, Alexander 7,8; Churikova, Tatiana 9; Woerner, Gerhard 8
	2020-05-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN	2169-9313
卷号	125 期号:5 页码:18
摘要	Chalcophile elements and lithium (Li) isotopes were measured on lavas from a 220-km transect across the Kamchatka arc in order to investigate the fluid variations below arc volcanoes and to trace the geochemical behaviour of Li in convergent plate margins. From the Eastern Volcanic Front (EVF), through the Central Kamchatka Depression (CKD), into the Sredinny Range (SR) volcanic zones, chalcophile element ratios (e.g., As/Ce and Sb/Ce) show clear across-arc variations, decreasing (e.g., As/Ce: 0.20 to 0.03 and Sb/Ce: 0.013 to 0.002) with increasing depth above the slab (110 to 400 km). This clearly indicates a gradually decreasing influx of slab-derived fluids added to the mantle wedge as the slab subducts below Kamchatka. In addition, the anomalously high U/Th, La/Sm, and B/Nb ratios in the CKD lavas suggest lawsonite breakdown reaction dominates the fluid release in this area. However, Li/Y (0.07 to 1.78) and delta Li-7 (+1.8 to +5.4 parts per thousand, with an exception of +8.6 parts per thousand in CKD) show limited variations and values similar to the MORB mantle. A dehydration model suggests that slab-derived fluids, which are characterized by high Li concentration and high delta Li-7, do not control the Li budget in Kamchatka arc lavas. Therefore, the isotopic heavy Li from slab-derived fluids likely equilibrates in the sub-arc mantle, which acts as a buffer for Li systematics. In addition, based on the Li isotopic signatures of Klyuchevskoy volcano, our study demonstrates insignificant Li isotopic fractionation during mantle melting and subsequent differentiation.
DOI	10.1029/2019JB019237
收录类别	SCI
语种	英语
资助项目	Qingdao National Laboratory for Marine Science and Technology[2017ASTCP-OS07] ; Chinese Academy of Sciences[XDB18000000] ; Qingdao National Laboratory for Marine Science and Technology[2017ASKJ02] ; China Postdoctoral Science Foundation[2019M652497] ; postdoctoral innovation project of Shandong province ; National Natural Science Foundation of China[41673031] ; National Natural Science Foundation of China[41729001] ; National Natural Science Foundation of China[41903006] ; postdoctoral applied research program of Qingdao City ; Taishan Scholar Program of Shandong[201712075] ; RFBR[20-55-50001]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000562379800042
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.qdio.ac.cn/handle/337002/168316
专题	深海极端环境与生命过程研究中心
通讯作者	Xiao, Yilin
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle & Environm, Hefei, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Mineral Resources, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 5.CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China 6.Llefei Univ Technol, Sch Resources & Environm Engn, Hefei, Peoples R China 7.Helmholtz Ctr Ocean Res Kiel, Div Marine Geosyst Kid, Kiel, Germany 8.Univ Gottingen, Geowissensch Zentrum, Gottingen, Germany 9.Russian Acad Sci, Inst Volcanol & Seismol, Far East Branch, Petropavlovsk Kamchatski, Russia
第一作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Liu, Haiyang,Xiao, Yilin,Sun, He,et al. Trace Elements and Li Isotope Compositions Across the Kamchatka Arc: Constraints on Slab-Derived Fluid Sources[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(5):18.
APA	Liu, Haiyang.,Xiao, Yilin.,Sun, He.,Tong, Fengtai.,Heuser, Alexander.,...&Woerner, Gerhard.(2020).Trace Elements and Li Isotope Compositions Across the Kamchatka Arc: Constraints on Slab-Derived Fluid Sources.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(5),18.
MLA	Liu, Haiyang,et al."Trace Elements and Li Isotope Compositions Across the Kamchatka Arc: Constraints on Slab-Derived Fluid Sources".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.5(2020):18.

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