Subduction contribution to the magma source of the Okinawa Trough-Evidence from boron isotopes
Zhang, Xia1; Zhai, Shikui1; Yu, Zenghui1; Guo, Kun2,3; Wang, Shujie2
Corresponding AuthorZhai, Shikui(
AbstractBoron (B) has been an excellent geochemical tracer for the investigation of magmatism in arcs and back-arc basins, due to its high fluid mobility and distinct isotope compositions in the mantle wedge and subducting slabs. In this study, B isotope compositions of the volcanic rocks collected from the northern, middle, and southern Okinawa Trough were determined to discuss the sources of B in the magma and assess the contribution of subduction components to the magma source. The results show that B in the volcanic rocks from the Okinawa Trough are mainly from the underlying mantle wedge but influenced by the fluids derived from the subducted slab. Compared with volcanic rocks from the middle Okinawa Trough, samples from the southern Okinawa Trough are generated from the source with larger proportion of subduction components. For the volcanic rocks from the northern Okinawa Trough, the influence of the subduction components is the most significant and the proportion of slab-derived B in the magma reaches up to 30%. It is estimated that the subduction components are composed of altered oceanic crust/serpentinite fluid and sediment fluid with the proportion of 94:6. The B-rich fluid, loaded by cold and fast dipping slab, released into overlying mantle wedge resulting in partial melting of mantle is the genetic mechanism of B-rich volcanic rocks in the Okinawa Trough.
Keywordboron isotope Okinawa Trough subduction components volcanic rocks
Indexed BySCI
Funding ProjectNational Key Basic Research Program of China[2013CB429702] ; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-KF201707]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000455038100039
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhai, Shikui
Affiliation1.Ocean Univ China, Coll Marine Geosci, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Qingdao 266100, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xia,Zhai, Shikui,Yu, Zenghui,et al. Subduction contribution to the magma source of the Okinawa Trough-Evidence from boron isotopes[J]. GEOLOGICAL JOURNAL,2019,54(1):605-613.
APA Zhang, Xia,Zhai, Shikui,Yu, Zenghui,Guo, Kun,&Wang, Shujie.(2019).Subduction contribution to the magma source of the Okinawa Trough-Evidence from boron isotopes.GEOLOGICAL JOURNAL,54(1),605-613.
MLA Zhang, Xia,et al."Subduction contribution to the magma source of the Okinawa Trough-Evidence from boron isotopes".GEOLOGICAL JOURNAL 54.1(2019):605-613.
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