Constraints of barium isotopes on recycling of ancient oceanic crust in the mantle of the South China Sea

doi:10.1016/j.jvolgeores.2022.107608

	Constraints of barium isotopes on recycling of ancient oceanic crust in the mantle of the South China Sea
	Shu, Yunchao 1,3,4; Zhang, Guo-Liang 2; Tian, Lan-Lan 1; Huang, Fang 1,3
	2022-09-01
发表期刊	JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
ISSN	0377-0273
卷号	429 页码:11
通讯作者	Shu, Yunchao([email protected]) ; Zhang, Guo-Liang([email protected])
摘要	As surface reservoirs (e.g. sediments and altered oceanic crust) have extremely high barium (Ba) concentrations and distinctive Ba isotope compositions compared to the mantle, Ba isotopes have the potential to trace crustal recycling in the mantle. The sediment components and fluids derived from altered oceanic crust in arc lavas and continental basalts have been identified using Ba isotopes, while the geochemical behavior of Ba in subducted oceanic crust remains enigmatic. A series of volcanic breccia that temporally evolved from carbonated silicate clasts to alkali basalts in the South China Sea (SCS) drilled by the Integrated Ocean Discovery Program (IODP) Site U1431 was suggested to originate from the mantle source contaminated by recycled oceanic crust. To understand the potential of using Ba stable isotopes to trace recycled oceanic crust in the mantle, we report high-precision Ba isotope compositions of these samples, together with alkali basalts from adjacent Hainan Island to constrain the Ba isotope characteristics of the Hainan mantle plume. The carbonated silicate clasts and alkali basalts from the SCS display extremely high Ba concentrations and are thus insensitive to magma evolution during ascent through the thin lithospheric mantle and proper to trace crustal materials in their mantle source using Ba isotopes. These samples have variable Ba isotope compositions ranging from delta Ba-138/134 = -0.10 to +0.05 parts per thousand, implying local mantle isotopic heterogeneity underlying the SCS. The Ba isotope characteristics of some samples, which are much lighter than those of the mantle-derived carbonatites and global mid-ocean ridge basalts (MORBs), in conjunction with trace element ratios and radiogenic isotope compositions, reflect significant incorporation of recycled carbonated oceanic crust after subduction-related dehydration. The rising of the Hainan mantle plume offers the most reasonable interpretation of the entrainment of the recycled oceanic crust in the carbonated silicate magmatism beneath the SCS. Alkali basalts from Hainan Island display Ba isotope characteristics slightly heavier than the SCS carbonated silicate clasts and alkali basalts. It implies that the Hainan mantle plume underlying Hainan Island contains less recycled-oceanic-crust components than that underneath the SCS. This study highlights Ba isotopes as effective tracers of recycled oceanic crust in the mantle.
关键词	Carbonated silicate melt Barium isotopes Recycled oceanic crust South China Sea
DOI	10.1016/j.jvolgeores.2022.107608
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2019YFA0708400]; National Natural Science Foundation of China[91858206]; National Natural Science Foundation of China[41903008]; China Postdoctoral Science Foundation[2019M660153]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000833539100003
出版者	ELSEVIER
引用统计	被引频次：5[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/337002/179885
专题	深海极端环境与生命过程研究中心
通讯作者	Shu, Yunchao; Zhang, Guo-Liang
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei 230026, Anhui, Peoples R China 4.Okayama Univ, Inst Planetary Mat, Pheast Mem Lab Geochem & Cosmochem, Misasa, Tottori 6820193, Japan
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	Shu, Yunchao,Zhang, Guo-Liang,Tian, Lan-Lan,et al. Constraints of barium isotopes on recycling of ancient oceanic crust in the mantle of the South China Sea[J]. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,2022,429:11.
APA	Shu, Yunchao,Zhang, Guo-Liang,Tian, Lan-Lan,&Huang, Fang.(2022).Constraints of barium isotopes on recycling of ancient oceanic crust in the mantle of the South China Sea.JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,429,11.
MLA	Shu, Yunchao,et al."Constraints of barium isotopes on recycling of ancient oceanic crust in the mantle of the South China Sea".JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 429(2022):11.