Mineral and fluid inclusions in zircon of UHP metamorphic rocks from the;CCSD-main drill hole: A record of metamorphism and fluid activity

doi:10.1016/j.lithos.2006.04.003

	Mineral and fluid inclusions in zircon of UHP metamorphic rocks from the;CCSD-main drill hole: A record of metamorphism and fluid activity
	Zhang, Zeming 5; Shen, Kun ; Xiao, Yilin ; Hoefs, Jochen ; Liou, J. G.
刊名	LITHOS
	2006
卷号	92 期号:3-4 页码:378-398
关键词	zircon mineral and fluid inclusions fluid evolution UHP metamorphism drill core Chinese Continental Scientific Drilling
ISSN号	0024-4937
DOI	10.1016/j.lithos.2006.04.003
英文摘要	The Chinese Continental Scientific Drilling (CCSD) main drill hole (0-3000 m) in Donghai, southern Sulu orogen, consists of eclogite, paragneiss, orthogneiss, schist and gamet peridotite. Detailed investigations of Raman, cathodoluminescence, and microprobe analyses show that zircons from most eclogites, gneisses and schists have oscillatory zoned magmatic cores with low-pressure mineral inclusions of Qtz, Pl, Kf and Ap, and a metamorphic rim with relatively uniform luminescence and eclogite-facies mineral inclusions of Grt, Omp, Phn, Coe and Rt. The chemical compositions of the UHP metamorphic mineral inclusions in zircon are similar to those from the matrix of the host rocks. Similar UHP metamorphic P-T conditions of about 770 degrees C and 32 kbar were estimated from coexisting minerals in zircon and in the matrix. These observations suggest that all investigated lithologies experienced a joint in situ UHP metamorphism during continental deep subduction. In rare cases, magmatic cores of zircon contain coesite and omphacite inclusions and show patchy and irregular luminescence, implying that the cores have been largely altered possibly by fluid-mineral interaction during UHP metamorphism.;Abundant H2O-CO2, H2O- or CO2-dominated fluid inclusions with low to medium salinities occur isolated or clustered in the magmatic cores of some zircons, coexisting with low-P mineral inclusions. These fluid inclusions should have been trapped during magmatic crystallization and thus as primary. Only few H2O- and/or CO2-dominated fluid inclusions were found to occur together with UHP mineral inclusions in zircons of metamorphic origin, indicating that UHP metamorphism occurred under relatively dry conditions. The diversity in fluid inclusion populations in UHP rocks from different depths suggests a closed fluid system, without large-scale fluid migration during subduction and exhumation. (c) 2006 Elsevier B.V. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	ULTRAHIGH-PRESSURE METAMORPHISM ; SUBDUCTED CONTINENTAL-CRUST ; COESITE-BEARING ECLOGITE ; ZONE SOUTHERN ALPS ; NORTH DABIE-SHAN ; EASTERN ; CHINA ; ION MICROPROBE ; SULU TERRANE ; WESTERN ALPS ; ISOTOPE GEOCHEMISTRY
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000242984700005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38240]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Inst Geol Sci Shandong, Shandong 250013, Jinan, Peoples R China. 3.Univ Gottingen, Geosci Ctr, D-37077 Gottingen, Germany. 4.Stanford Univ, Dept Geog & Environm Sci, Stanford, CA 94305 USA. 5.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, Zeming,Shen, Kun,Xiao, Yilin,et al. Mineral and fluid inclusions in zircon of UHP metamorphic rocks from the;CCSD-main drill hole: A record of metamorphism and fluid activity[J]. LITHOS,2006,92(3-4):378-398.
APA	Zhang, Zeming,Shen, Kun,Xiao, Yilin,Hoefs, Jochen,&Liou, J. G..(2006).Mineral and fluid inclusions in zircon of UHP metamorphic rocks from the;CCSD-main drill hole: A record of metamorphism and fluid activity.LITHOS,92(3-4),378-398.
MLA	Zhang, Zeming,et al."Mineral and fluid inclusions in zircon of UHP metamorphic rocks from the;CCSD-main drill hole: A record of metamorphism and fluid activity".LITHOS 92.3-4(2006):378-398.