Lithium, Oxygen and Magnesium Isotope Systematics of Volcanic Rocks in the Okinawa Trough: Implications for Plate Subduction Studies

doi:10.3390/jmse10010040

IOCAS-IR > 海洋地质与环境重点实验室

	Lithium, Oxygen and Magnesium Isotope Systematics of Volcanic Rocks in the Okinawa Trough: Implications for Plate Subduction Studies
	Zeng, Zhigang1,2,3 ; Li, Xiaohui 1; Zhang, Yuxiang1,4 ; Qi, Haiyan 1,4
	2022
发表期刊	JOURNAL OF MARINE SCIENCE AND ENGINEERING
卷号	10 期号:1 页码:26
通讯作者	Zeng, Zhigang([email protected])
摘要	Determining the influence of subduction input on back-arc basin magmatism is important for understanding material transfer and circulation in subduction zones. Although the mantle source of Okinawa Trough (OT) magmas is widely accepted to be modified by subducted components, the role of slab-derived fluids is poorly defined. Here, major element, trace element, and Li, O and Mg isotopic compositions of volcanic lavas from the middle OT (MOT) and southern OT (SOT) were analyzed. Compared with the MOT volcanic lavas, the T9-1 basaltic andesite from the SOT exhibited positive Pb anomalies, significantly lower Nd/Pb and Ce/Pb ratios, and higher Ba/La ratios, indicating that subducted sedimentary components affected SOT magma compositions. The delta Li-7, delta O-18, and delta Mg-26 values of the SOT basaltic andesite (-5.05 parts per thousand to 4.98 parts per thousand, 4.83 parts per thousand to 5.80 parts per thousand and -0.16 parts per thousand to -0.09 parts per thousand, respectively) differed from those of MOT volcanic lavas. Hence, the effect of the Philippine Sea Plate subduction component, (low delta Li-7 and delta O-18 and high delta Mg-26) on magmas in the SOT was clearer than that in the MOT. This contrast likely appears because the amounts of fluids and/or melts derived from altered oceanic crust (AOC, lower delta O-18) and/or subducted sediment (lower delta Li-7, higher delta O-18 and delta Mg-26) injected into magmas in the SOT are larger than those in the MOT and because the injection ratio between subducted AOC and sediment is always >1 in the OT. The distance between the subducting slab and overlying magma may play a significant role in controlling the differences in subduction components injected into magmas between the MOT and SOT.
关键词	Li-O-Mg isotopes magma plate subduction Okinawa Trough western Pacific
DOI	10.3390/jmse10010040
收录类别	SCI
语种	英语
WOS研究方向	Engineering ; Oceanography
WOS类目	Engineering, Marine ; Engineering, Ocean ; Oceanography
WOS记录号	WOS:000748150800001
出版者	MDPI
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/337002/177918
专题	海洋地质与环境重点实验室
通讯作者	Zeng, Zhigang
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 3.Univ Chinese Acad Sci, Coll Marine Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
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	Zeng, Zhigang,Li, Xiaohui,Zhang, Yuxiang,et al. Lithium, Oxygen and Magnesium Isotope Systematics of Volcanic Rocks in the Okinawa Trough: Implications for Plate Subduction Studies[J]. JOURNAL OF MARINE SCIENCE AND ENGINEERING,2022,10(1):26.
APA	Zeng, Zhigang,Li, Xiaohui,Zhang, Yuxiang,&Qi, Haiyan.(2022).Lithium, Oxygen and Magnesium Isotope Systematics of Volcanic Rocks in the Okinawa Trough: Implications for Plate Subduction Studies.JOURNAL OF MARINE SCIENCE AND ENGINEERING,10(1),26.
MLA	Zeng, Zhigang,et al."Lithium, Oxygen and Magnesium Isotope Systematics of Volcanic Rocks in the Okinawa Trough: Implications for Plate Subduction Studies".JOURNAL OF MARINE SCIENCE AND ENGINEERING 10.1(2022):26.

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