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

CORC > 北京大学 > 地球与空间科学学院

	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 ; Zhang, Lifei ; Christy, Andrew G. ; Song, Shuguang ; Li, Qiuli
刊名	lithos
	2014
关键词	Rutile U-Pb geochronology Zr-in-rutile thermometry Zircon U-Pb geochronology Ti-in-zircon thermometry Eclogite North Qaidam ZR-IN-RUTILE COESITE-BEARING ECLOGITE WESTERN CHINA CONTINENTAL COLLISION TIBETAN PLATEAU OCEANIC SUBDUCTION XITIESHAN TERRANE HP/UHP TERRANE DULAN AREA BELT
DOI	10.1016/j.lithos.2014.06.018
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.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000342524800002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geochemistry & Geophysics; Mineralogy; SCI(E); 5; ARTICLE; gbzhang@pku.edu.cn; 15-27; 205
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155401]
专题	地球与空间科学学院
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.
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.
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 (2014).