Petrologic perspectives on tectonic evolution of a nascent basin (Okinawa Trough) behind Ryukyu Arc: A review

doi:10.1007/s13131-014-0400-2

	Petrologic perspectives on tectonic evolution of a nascent basin (Okinawa Trough) behind Ryukyu Arc: A review
	Yan Quanshu; Shi Xuefa
刊名	ACTA OCEANOLOGICA SINICA
	2014-04
卷号	33 期号:4 页码:1-12
关键词	nascent ocean basin spreading tectonic evolution petrology geochemistry Okinawa Trough
ISSN号	0253-505X
DOI	10.1007/s13131-014-0400-2
英文摘要	Okinawa Trough is a back-arc, initial marginal sea basin, located behind the Ryukyu Arc-Trench System. The formation and evolution of the Okinawa Trough is intimately related to the subduction process of the Philippine Sea Plate beneath the Eurasian Plate since the late Miocene. The tectonic evolution of the trough is similar to other active back-arcs, such as the Mariana Trough and southern Lau Basin, all of which are experiencing the initial rifting and subsequent spreading process. This study reviews all petrologic and geochemical data of mafic volcanic lavas from the Okinawa Trough, Ryukyu Arc, and Philippine Sea Plate, combined with geophysical data to indicate the relationship between the subduction sources (input) and arc or back-arc magmas (output) in the Philippine Sea Plate-Ryukyu Arc-Okinawa Trough system (PROS). The results obtained showed that several components were variably involved in the petrogenesis of the Okinawa Trough lavas: sub-continental lithospheric mantle underlying the Eurasian Plate, Indian mid-oceanic ridge basalt (MORB)-type mantle, and Pacific MORB-type mantle. The addition of shallow aqueous fluids and deep hydrous melts from subducted components with the characteristics of Indian MORB-type mantle into the mantle source of lavas variably modifies the primitive mantle wedge beneath the Ryukyu and subcontinental lithospheric mantle (SCLM) beneath the Okinawa Trough. In the northeastern end of the trough and arc, instead of Indian MORB-type mantle, Pacific MORB-type mantle dominates the magma source. Along the strike of the Ryukyu Arc and Okinawa Trough, the systematic variations in trace element ratios and isotopic compositions reflect the first-order effect of variable subduction input on the magma source. In general, petrologic data, combined with geophysical data, imply that the Okinawa Trough is experiencing the "seafloor spreading" process in the southwest segment, "rift propagation" process in the middle segment, and "crustal extension" process in the northeast segment, and a nascent ocean basin occurs in the southwest segment.
资助项目	China Ocean Mineral Resources R&D Association (COMRA)[DY125-12-R-05]
WOS关键词	WEST PHILIPPINE BASIN ; VOLCANIC-ROCKS ; ISOTOPIC CHARACTERISTICS ; CONTINENTAL-CRUST ; CENOZOIC BASALTS ; MARIANA TROUGH ; TRACE-ELEMENT ; PB ISOTOPE ; SEA PLATE ; MANTLE
WOS研究方向	Oceanography
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000333727700001
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/27070]
专题	自然资源部第一海洋研究所
通讯作者	Yan Quanshu
作者单位	State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentary & Environm Geol, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Yan Quanshu,Shi Xuefa. Petrologic perspectives on tectonic evolution of a nascent basin (Okinawa Trough) behind Ryukyu Arc: A review[J]. ACTA OCEANOLOGICA SINICA,2014,33(4):1-12.
APA	Yan Quanshu,&Shi Xuefa.(2014).Petrologic perspectives on tectonic evolution of a nascent basin (Okinawa Trough) behind Ryukyu Arc: A review.ACTA OCEANOLOGICA SINICA,33(4),1-12.
MLA	Yan Quanshu,et al."Petrologic perspectives on tectonic evolution of a nascent basin (Okinawa Trough) behind Ryukyu Arc: A review".ACTA OCEANOLOGICA SINICA 33.4(2014):1-12.