Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China

doi:10.1016/j.epsl.2006.07.043

	Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China
	Liu, Dunyi 4; Jian, Ping ; Kroener, Alfred ; Xu, Shutong
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2006
卷号	250 期号:3-4 页码:650-666
关键词	Dabie-Sulu SHRIMP eclogite and peridotite zircon UHP metamorphism
ISSN号	0012-821X
DOI	10.1016/j.epsl.2006.07.043
英文摘要	The timing of ultra-high pressure (UHP) metamorphism has been difficult to determine because of a lack of age constraints on crucial events, especially those occurring on the prograde path. New Sensitive High-Resolution Ion Microprobe (SHRIMP) U-Pb age and rare-earth element (REE) data of zircon are presented for UHP metamorphic rocks (eclogite, garnet peridotite, garnet pyroxenite, jadeite quartzite and garnet gneiss) along the Dabie-Sulu UHP complex of China. With multiphase metamorphic textures and index mineral inclusions within zircon, the Dabie data define three episodes of eclogite-facies metamorphism, best estimated at 242.1 +/- 0.4 Ma, 227.2 +/- 0.8 Ma and 219.8 +/- 0.8 Ma. Eclogite-facies zircons of the Sulu UHP complex grew during two major episodes at 242.7 +/- 1.2 and 227.5 +/- 1.3 Ma, which are indistinguishable from corresponding events in the Dabie UHP complex. A pre-eclogite metamorphic phase at 244.0 +/- 2.6 Ma was obtained from two Sulu zircon samples which contain low pressure-temperature (plagioclase, stable below the quartz/Ab transformation) and hydrous (e.g., amphibole, stable below similar to 2.5 Gpa) mineral inclusions. In terms of Fe-Mg exchange of trapped garnet-clinopyroxene pairs within zircon domains, we are able to determine the Pressure-Temperature (PT) conditions for a specific episode of metamorphic zircon growth. We suggest that mineral phase transformations and associated dehydration led to episodic eclogite-facies zircon growth during UHP metamorphism (similar to 2.7 Gpa) began at 242.2 +/- 0.4 Ma (n = 74, pooling the Dabie-Sulu data), followed by peak UHP metamorphism (> similar to 4 Gpa) at 227.3 +/- 0.7 Ma (n=72), before exhumation (
学科主题	变质岩岩石学
WOS关键词	ULTRAHIGH-PRESSURE METAMORPHISM ; EAST-CENTRAL CHINA ; U-PB ZIRCON ; COESITE-BEARING ECLOGITE ; WESTERN GNEISS REGION ; SM-ND AGES ; GARNET ; PERIDOTITE ; TECTONIC IMPLICATIONS ; MINERAL INCLUSIONS ; CONTINENTAL-CRUST
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000242195100017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38207]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, SHRIMP Unit, Inst Geol, Beijing 100037, Peoples R China. 2.Univ Mainz, Inst Geowissensch, D-55099 Mainz, Germany. 3.Anhui Inst Geol, Hefei 23001, Anhui, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu, Dunyi,Jian, Ping,Kroener, Alfred,et al. Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China[J]. EARTH AND PLANETARY SCIENCE LETTERS,2006,250(3-4):650-666.
APA	Liu, Dunyi,Jian, Ping,Kroener, Alfred,&Xu, Shutong.(2006).Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China.EARTH AND PLANETARY SCIENCE LETTERS,250(3-4),650-666.
MLA	Liu, Dunyi,et al."Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China".EARTH AND PLANETARY SCIENCE LETTERS 250.3-4(2006):650-666.