Differential exhumation and cooling history of North Qaidam UHP metamorphic rocks, NW China: Constraints from zircon and rutile thermometry and U-Pb geochronology

doi:10.1016/j.lithos.2014.06.018

	Differential exhumation and cooling history of North Qaidam UHP metamorphic rocks, NW China: Constraints from zircon and rutile thermometry and U-Pb geochronology
	Zhang, Guibin 1; Zhang, Lifei 1; Christy, Andrew G.2; Song, Shuguang 1; Li, Qiuli 3
刊名	LITHOS
	2014-09-15
卷号	205 页码:15-27
关键词	Rutile U-Pb geochronology Zr-in-rutile thermometry Zircon U-Pb geochronology Ti-in-zircon thermometry Eclogite North Qaidam
ISSN号	0024-4937
DOI	10.1016/j.lithos.2014.06.018
文献子类	Article
英文摘要	We analyze zircon and rutile U-Pb ages and trace elements using LA-ICP-MS and SIMS of edogites from the North Qaidam ultra-high-pressure metamorphic belt in NW China. Zr-in-rutile and Ti-in-zircon thermometries give consistent peak metamorphic temperatures for two fresh eclogite samples. Zircon and rutile U-Pb dating from the Yuka eclogite yielded ages of 430.2 +/- 3.7 Ma and 407 +/- 16 Ma respectively. Zircons from North Dulan eclogite record two distinct eclogite-facies metamorphic events at 446.6 +/- 4.1 and 430.5 +/- 4.7 Ma, with TTi-in-zircon = 684 +/- 16 degrees C and 649 +/- 26 degrees C respectively, while rutile U-Pb dating for the same North Dulan eclogite sample yielded an age of 416 +/- 10 Ma. These rutile U-Pb ages are interpreted to record the time when these rocks cooled down to the closure temperature of Pb in rutile (here, taken to be ca. 570 degrees C). Thus, we obtain a slow cooling rate of similar to 3-4 degrees C/Ma for Yuka and North Dulan terranes. For one granulite-facies overprinted South Dulan eclogite sample, rutile U-Pb dating gave a younger age of 383 +/- 10 Ma. Combined with literature chronological and temperature data for South Dulan, the data imply later exhumation than the other samples with a faster cooling rate of similar to 6.6 degrees C/Ma, after the granulite-facies event. The T-t paths obtained show that the North Qaidam edogites experienced considerably slower cooling history than previously assumed, and also that while the thermal histories of the Yuka and North Dulan edogites resemble one another, the South Dulan edogite is quite distinct. So, a differential exhumation and emplacement of UHP metamorphic rocks occurred in the North Qaidam. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	ZR-IN-RUTILE ; COESITE-BEARING ECLOGITE ; WESTERN CHINA ; CONTINENTAL COLLISION ; TIBETAN PLATEAU ; OCEANIC SUBDUCTION ; XITIESHAN TERRANE ; HP/UHP TERRANE ; DULAN AREA ; BELT
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000342524800002
资助机构	National Natural Science Foundation of China(41272068 ; National Natural Science Foundation of China(41272068 ; Program for New Century Excellent Talents in University(NCET-13-0017) ; Program for New Century Excellent Talents in University(NCET-13-0017) ; 41330210 ; 41330210 ; 41372060 ; 41372060 ; 41222023 ; 41222023 ; 41121062 ; 41121062 ; 41090371) ; 41090371) ; National Natural Science Foundation of China(41272068 ; National Natural Science Foundation of China(41272068 ; Program for New Century Excellent Talents in University(NCET-13-0017) ; Program for New Century Excellent Talents in University(NCET-13-0017) ; 41330210 ; 41330210 ; 41372060 ; 41372060 ; 41222023 ; 41222023 ; 41121062 ; 41121062 ; 41090371) ; 41090371) ; National Natural Science Foundation of China(41272068 ; National Natural Science Foundation of China(41272068 ; Program for New Century Excellent Talents in University(NCET-13-0017) ; Program for New Century Excellent Talents in University(NCET-13-0017) ; 41330210 ; 41330210 ; 41372060 ; 41372060 ; 41222023 ; 41222023 ; 41121062 ; 41121062 ; 41090371) ; 41090371) ; National Natural Science Foundation of China(41272068 ; National Natural Science Foundation of China(41272068 ; Program for New Century Excellent Talents in University(NCET-13-0017) ; Program for New Century Excellent Talents in University(NCET-13-0017) ; 41330210 ; 41330210 ; 41372060 ; 41372060 ; 41222023 ; 41222023 ; 41121062 ; 41121062 ; 41090371) ; 41090371)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86126]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Guibin
作者单位	1.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Australian Natl Univ, Ctr Adv Microscopy, Canberra, ACT 0200, Australia 3.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	Zhang, Guibin,Zhang, Lifei,Christy, Andrew G.,et al. Differential exhumation and cooling history of North Qaidam UHP metamorphic rocks, NW China: Constraints from zircon and rutile thermometry and U-Pb geochronology[J]. LITHOS,2014,205:15-27.
APA	Zhang, Guibin,Zhang, Lifei,Christy, Andrew G.,Song, Shuguang,&Li, Qiuli.(2014).Differential exhumation and cooling history of North Qaidam UHP metamorphic rocks, NW China: Constraints from zircon and rutile thermometry and U-Pb geochronology.LITHOS,205,15-27.
MLA	Zhang, Guibin,et al."Differential exhumation and cooling history of North Qaidam UHP metamorphic rocks, NW China: Constraints from zircon and rutile thermometry and U-Pb geochronology".LITHOS 205(2014):15-27.