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Influence of subduction components on magma composition in back-arc basins: a comparison between the Mariana and Okinawa troughs
Zhao, Guangtao1; Luo, Wenqiang2; Lai, Zhiqing1; Tian, Liyan3; Xu, Cuiling1
2016-08-01
Source PublicationGEOLOGICAL JOURNAL
Volume51Pages:357-367
AbstractNew Sr, Nd, and Pb isotopic data of seven basalt samples from the middle Mariana Trough were analysed together with existing geochemical data of basalts from the middle Mariana Trough (MMT), the northern Mariana Trough (NMT), the middle Okinawa Trough (MOT), and the southern Okinawa Trough (SOT). Basalts from the Mariana and Okinawa troughs have similarities to island arc lavas and are enriched in large ion lithophile elements but depleted in high field strength elements compared with normal mid-ocean ridge basalt (N-MORB). The Sr, Nd, and Pb isotopic compositions of the back-arc basin basalts maybe modelled by a mixing between end-member components of N-MORB-like mantle and enriched mantle end-member. Modelling results suggest that as the degree of back-arc extension increases, the proportion of subduction components in the source magma decreases. The compositions of SOT basalts can be explained by the mixing of subduction components in the proportion 16%, followed by MOT at 14%, NMT at 7%, and MMT at 4%. This result indicates that the contribution of subduction components to the composition of source magmas for back-arc basalts is closely related to the tectonic evolution of the entire back-arc system. The proportions of subduction components in basaltic magma sources can be used as an indicator of the extent of evolution of a back-arc basin or the development of a back-arc spreading system. Copyright (c) 2016 John Wiley & Sons, Ltd.
SubtypeArticle
KeywordPetro-geochemistry Subduction Component Back-arc Basin Mariana Trough Okinawa Trough
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/gj.2820
Indexed BySCI
Language英语
WOS KeywordAMERICAN VOLCANIC ARC ; ISOTOPIC COMPOSITION ; SPREADING CENTER ; TRACE-ELEMENT ; MANTLE ; GEOCHEMISTRY ; BASALTS ; LAVAS ; EVOLUTION ; SYSTEM
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000383513600026
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/1651
Collection深海科学研究部_深海地质与地球化学研究室
Affiliation1.Ocean Univ China, Minist Educ, Key Lab Submarine Geosci & Prospecting Tech, Qingdao, Peoples R China
2.Shandong Geol Sci Inst, Jinan, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Guangtao,Luo, Wenqiang,Lai, Zhiqing,et al. Influence of subduction components on magma composition in back-arc basins: a comparison between the Mariana and Okinawa troughs[J]. GEOLOGICAL JOURNAL,2016,51:357-367.
APA Zhao, Guangtao,Luo, Wenqiang,Lai, Zhiqing,Tian, Liyan,&Xu, Cuiling.(2016).Influence of subduction components on magma composition in back-arc basins: a comparison between the Mariana and Okinawa troughs.GEOLOGICAL JOURNAL,51,357-367.
MLA Zhao, Guangtao,et al."Influence of subduction components on magma composition in back-arc basins: a comparison between the Mariana and Okinawa troughs".GEOLOGICAL JOURNAL 51(2016):357-367.
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