SHRIMP U-Pb dating of coesite-bearing zircon from the ultrahigh-pressure;metamorphic rocks, Sulu terrane, east China

doi:10.1046/j.1525-1314.2003.00463.x

	SHRIMP U-Pb dating of coesite-bearing zircon from the ultrahigh-pressure;metamorphic rocks, Sulu terrane, east China
	Yang, JS 4; Wooden, JL ; Wu, CL ; Liu, FL ; Xu, ZQ ; Shi, RD ; Katayama, I ; Liou, JG ; Maruyama, S
刊名	JOURNAL OF METAMORPHIC GEOLOGY
	2003
卷号	21 期号:6 页码:551-560
关键词	coesite eclogite peridotite SHRIMP Sulu UHPM
ISSN号	0263-4929
DOI	10.1046/j.1525-1314.2003.00463.x
英文摘要	This paper provides further evidence for the ongoing discussion as to whether the Dabie UHPM belt formed in Triassic or Palaeozoic time, and whether the Sulu UHPM belt formed in Triassic or Neoproterozoic time. Combined use of laser Raman spectrometer (LR), cathodoluminescence imaging (CL), and ion probe U-Pb in-situ dating (SHRIMP) provided accurate ages of UHPM from rocks collected from Weihai, NE Sulu UHPM belt. LR was used to identify coesite and other UHP minerals as inclusions in zircon separates from an amphibolized peridotite and an eclogite. CL was used to examine the zoning structure of these zircon, and SHRIMP dating was performed on specific spots on zircon to obtain ages of different geological events. An age of 221 +/- 12 Ma was obtained for coesite-bearing zircon from the amphibolized peridotite; an age of 228 +/- 29 Ma for eclogite was obtained from the lower intercept of a concordia plot. These ages are interpreted as the time of UHPM in the Weihai region. Ultramafic rocks to the east of Weihai yield a magmatic age at 581 +/- 44 Ma. The zircon in the ultramafic rocks possibly also records a thermal event at c. 400 Ma, but no independent geological evidence for this event has been found. The eclogite protolith formed in the Middle Proterozoic (1821 +/- 19 Ma), which is similar to the age of country rock gneisses of 1847-1744 Ma. The new geochronological data confirm that UHPM occurred in the Triassic in the Sulu area when subduction took the ultramafic body and the eclogite protolith, together with the adjacent supracrustal rocks, to mantle depths.
学科主题	变质岩岩石学
WOS关键词	DABIE SHAN ; AGES ; ECLOGITES ; GEOCHRONOLOGY ; SYSTEMATICS
WOS研究方向	Geology
语种	英语
出版者	BLACKWELL PUBLISHING LTD
WOS记录号	WOS:000184467500006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37585]
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, Lab Continental Dynam, Beijing 100037, Peoples R China. 2.Stanford Univ, Dept Geol & Environm Engn, Stanford, CA 94305 USA. 3.Tokyo Inst Technol, Dept Earth & Planetary Sci, Tokyo 1528551, Japan. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Yang, JS,Wooden, JL,Wu, CL,et al. SHRIMP U-Pb dating of coesite-bearing zircon from the ultrahigh-pressure;metamorphic rocks, Sulu terrane, east China[J]. JOURNAL OF METAMORPHIC GEOLOGY,2003,21(6):551-560.
APA	Yang, JS.,Wooden, JL.,Wu, CL.,Liu, FL.,Xu, ZQ.,...&Maruyama, S.(2003).SHRIMP U-Pb dating of coesite-bearing zircon from the ultrahigh-pressure;metamorphic rocks, Sulu terrane, east China.JOURNAL OF METAMORPHIC GEOLOGY,21(6),551-560.
MLA	Yang, JS,et al."SHRIMP U-Pb dating of coesite-bearing zircon from the ultrahigh-pressure;metamorphic rocks, Sulu terrane, east China".JOURNAL OF METAMORPHIC GEOLOGY 21.6(2003):551-560.