Extremely low-Ni olivine as a tracer of carbonate-rich sediment recycling beneath the soucnwestern ukinawa Trough

doi:10.1080/00206814.2021.1969525

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Extremely low-Ni olivine as a tracer of carbonate-rich sediment recycling beneath the soucnwestern ukinawa Trough
	Ding, Yi 1,2,3; Jin, Xianglong 1,2,3; Li, Zhenggang 1,3,4; Liu, Jiqiang 1,3; Zhu, Jihao 1,3; Zhu, Zhimin 1,3; Wang, Hao 1,3; Chu, Fengyou 1,2,3; Li, Xiaohu 1,3
刊名	INTERNATIONAL GEOLOGY REVIEW
	2021-09-02
页码	17
关键词	Okinawa Trough olivine extremely low Ni concentration carbonate recycling
ISSN号	0020-6814
DOI	10.1080/00206814.2021.1969525
通讯作者	Jin, Xianglong(Jinxljin@mai.hz.zj.cn) ; Li, Zhenggang(lizg@sio.org.cn) ; Li, Xiaohu(xhli@sio.org.cn)
英文摘要	Carbonate recycling in subduction zones has a strong influence on arc magmatism and carbon reservoirs in the mantle. However, geochemical evidence of carbonate recycling during subduction, especially at sub-arc depths, is rare and the related process is poorly understood. In this study, we document high-Mg olivines (81-91 mol.% forsterite) with extremely low Ni concentrations (mostly <600 ppm), which occur in host dacites recovered from the southwestern Okinawa Trough (SWOT). The temperature-pressure of crystallization had a negligible effect on the Ni contents of the olivines, and reactions between primary basaltic magmas and the lithospheric mantle were also insignificant. Small sulphide droplets are present in the olivines, which suggest that sulphid-esilicate melt immiscibility occurred during the early stages of magmatic evolution. Although early segregation of sulphide melts could reduce the M contents of the primitive magmas, our forward modelling suggests that sulphide segregation cannot solely explain the low Ni contents. Therefore, the most likely explanation for low Ni concentrations is the interaction between Ca-rich carbonate melts and the mantle wedge, forming an olivine-rich mantle source by consumption of orthopyroxene, as indicated by the extremely low Ni/Mg and high Ca/Fe ratios of magmatic olivines. Given that the SWOT is located just -100 km above the Wadati-Benioff zone, our results provide rare evidence for carbonate recycling at sub-arc depths in an active subduction zone.
资助项目	Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2020KG05] ; China Ocean Mineral R&D Association project[DY135-G2-1-03] ; National Basic Research Program of China[2013CB429705] ; National Natural Science Foundation of China[42003037] ; National Natural Science Foundation of China[41506073]
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000693544300001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/176352]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Jin, Xianglong; Li, Zhenggang; Li, Xiaohu
作者单位	1.Minist Nat Resources, Inst Oceanog 2, Hangzhou 310012, Peoples R China 2.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China 3.Minist Nat Resources, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Ding, Yi,Jin, Xianglong,Li, Zhenggang,et al. Extremely low-Ni olivine as a tracer of carbonate-rich sediment recycling beneath the soucnwestern ukinawa Trough[J]. INTERNATIONAL GEOLOGY REVIEW,2021:17.
APA	Ding, Yi.,Jin, Xianglong.,Li, Zhenggang.,Liu, Jiqiang.,Zhu, Jihao.,...&Li, Xiaohu.(2021).Extremely low-Ni olivine as a tracer of carbonate-rich sediment recycling beneath the soucnwestern ukinawa Trough.INTERNATIONAL GEOLOGY REVIEW,17.
MLA	Ding, Yi,et al."Extremely low-Ni olivine as a tracer of carbonate-rich sediment recycling beneath the soucnwestern ukinawa Trough".INTERNATIONAL GEOLOGY REVIEW (2021):17.