Record of multiple stage channelized fluid and melt activities in deeply subducted slab from zircon U-Pb age and Hf-O isotope compositions

doi:10.1016/j.gca.2014.08.016

	Record of multiple stage channelized fluid and melt activities in deeply subducted slab from zircon U-Pb age and Hf-O isotope compositions
	Liu, Xiaochi1,2 ; Wu, Yuanbao 1; Gao, Shan 1; Wang, Hao 1; Zheng, Jianping 1; Hu, Zhaochu 1; Zhou, Lian 1; Yang, Saihong 2
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2014-11-01
卷号	144 页码:1-24
ISSN号	0016-7037
DOI	10.1016/j.gca.2014.08.016
文献子类	Article
英文摘要	Geochemical features of island arc rocks require two slab-derived components of a melt and a fluid added to their sources. These two liquids may unite to an intermediate aqueous melt at the base of volcanic arc. Direct evidence of this process has been scarce yet. Here we present an integrated study of in situ U-Pb age, trace element, and O-Hf isotope for zircons from a suite of a quartz vein, a felsic vein, their host eclogite, and surrounding gneiss at the Xitieshan UHP terrane of the North Qaidam metamorphic belt (NQMB). Oscillatory zoned zircons from the quartz vein are enriched in U, Li, Nb, and REE, with a formation age of 442 +/- 6 Ma, consistent with the timing of the peak UHP metamorphism. This demonstrates there is no temporal gap between the UHP metamorphism and fluid flow in the Xitieshan terrane. In particular, the oscillatory zoned zircons of the quartz vein have similar Hf isotope compositions to zircons from the surrounding gneiss, but variable O isotope compositions between the host eclogite and surrounding gneiss. The fluid from surrounded gneiss was thus an aqueous melt with high transport ability for Lu and Hf and O, while the fluid from the host eclogite was an aqueous fluid only with the ability to transport O. According to the similar behaviors of granitic rock and sediment, it is inferred that a channelized hydrous melt can be formed in the downgoing sediment layer, where an aqueous fluid can be formed from underlying basalt and/or peridotite layers at the sub-arc depth. The two types of fluid are fed to the overlying mantle wedge from subducting slab to form island arc rock. By contrast, the zircons in the felsic vein yield a weighted mean Pb-206/U-238 age of 420 +/- 4 Ma, which can be regard as the timing of partial melting during the exhumed stage for the Xitieshan UHP rocks. The zircon O and Hf isotopic features of the felsic vein are between the country gneiss and host eclogite, compatible with their emanating from hydrous melt of both the eclogite and gneiss during the exhumation stage of the UHP rocks. This indicates that hydrous melt would be released from both the sediment and basalt or peridotite layers of the subducting slabs at relatively shallow depth. (C) 2014 Elsevier Ltd. All rights reserved.
WOS关键词	PRESSURE METAMORPHIC ROCKS ; QAIDAM UHPM BELT ; DORA-MAIRA MASSIF ; NORTH QAIDAM ; NW CHINA ; CONTINENTAL-CRUST ; TRACE-ELEMENTS ; WESTERN CHINA ; LU-HF ; EASTERN CHINA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000344945600001
资助机构	Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162) ; 1212011120162) ; 1212011120162) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162) ; 1212011120162) ; 1212011120162) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162) ; 1212011120162) ; 1212011120162) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; Chinese '973' Project(2015CB856106) ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; National Natural Science Foundation of China(41273035 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Chinese Geological Survey Bureau(SinoProbe-05-04 ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; Ministry of Education of China(B07039) ; 41173017) ; 41173017) ; 41173017) ; 41173017) ; 1212011120162) ; 1212011120162) ; 1212011120162) ; 1212011120162)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85620]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu, Yuanbao
作者单位	1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiaochi,Wu, Yuanbao,Gao, Shan,et al. Record of multiple stage channelized fluid and melt activities in deeply subducted slab from zircon U-Pb age and Hf-O isotope compositions[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2014,144:1-24.
APA	Liu, Xiaochi.,Wu, Yuanbao.,Gao, Shan.,Wang, Hao.,Zheng, Jianping.,...&Yang, Saihong.(2014).Record of multiple stage channelized fluid and melt activities in deeply subducted slab from zircon U-Pb age and Hf-O isotope compositions.GEOCHIMICA ET COSMOCHIMICA ACTA,144,1-24.
MLA	Liu, Xiaochi,et al."Record of multiple stage channelized fluid and melt activities in deeply subducted slab from zircon U-Pb age and Hf-O isotope compositions".GEOCHIMICA ET COSMOCHIMICA ACTA 144(2014):1-24.