Early Paleozoic granulite-facies metamorphism and anatexis in the   northern West Qinling orogen: Monazite and zircon U-Pb geochronological   constraints

doi:10.1007/s11430-016-9029-7

CORC > 北京大学 > 地球与空间科学学院

	Early Paleozoic granulite-facies metamorphism and anatexis in the northern West Qinling orogen: Monazite and zircon U-Pb geochronological constraints
	Mao XiaoHong ; Zhang JianXin ; Yu ShengYao ; Li YunShuai ; Yu XingXing ; Lu ZengLong
刊名	SCIENCE CHINA-EARTH SCIENCES
	2017
关键词	West Qinling Granulite Migmatite U-Pb age dating Metamorphism Early Paleozoic LA-ICP-MS PLASMA-MASS SPECTROMETRY ULTRAHIGH-TEMPERATURE METAMORPHISM SOUTH CHINA BLOCKS TECTONIC EVOLUTION PHASE-EQUILIBRIA DEEP SUBDUCTION TONGBAI OROGEN GEOLOGICAL SIGNIFICANCE CONTINENTAL COLLISION
DOI	10.1007/s11430-016-9029-7
英文摘要	In the northern West Qinling orogen (WQO), granulite-facies metamorphic rocks are recognized within the Qinling Complex. These rocks are composed of amphibole-bearing two-pyroxene granulite and garnet-sillimanite gneiss with widespread migmatitization. We investigate three granulite-facies samples and one leucosome sample from the Qinling Complex, which are suitable for U-Pb analyses of zircon and monazite. SHRIMP and LA-ICPMS U-Pb age dating of zircon and monazite from two pelitic granulites provides weighted mean ages of 430 +/- 4 Ma (MSWD=0.88) and 433 +/- 4 Ma (MSWD=0.27), respectively. Based on the petrographic characteristics and zircon CL imagery, we postulated a ca. 430 Ma metamorphic timing for the pelitic granulites. LA-ICPMS zircon U-Pb data from an amphibole two-pyroxene granulite sample reports two weighted mean age groups: 424 +/- 3 Ma (MSWD=0.45) and 402 +/- 3 Ma (MSWD=1.4), which were interpreted as granulite-facies metamorphic and retrograde ages, respectively. LA-ICPMS U-Pb dating of zircons from the leucosome sample yields a weighted mean age of 426 +/- 2 Ma (MSWD=0.3), which is interpreted as the crystallization age of the leucosome. These data indicate that the West QOB experienced early Paleozoic granulite-facies metamorphism and anatexis similar to the East QOB. However, it remains unclear whether the early Paleozoic granulite facies metamorphism resulted from an arc setting created by the northward subduction of the Shangdan ocean or from a continental collisional orogenic event.; National Natural Science Foundation of China [41630207, 41572180]; China Geological Survey Project [12120115027001]; SCI(E); ARTICLE; 5; 943-957; 60
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/473744]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Mao XiaoHong,Zhang JianXin,Yu ShengYao,et al. Early Paleozoic granulite-facies metamorphism and anatexis in the northern West Qinling orogen: Monazite and zircon U-Pb geochronological constraints[J]. SCIENCE CHINA-EARTH SCIENCES,2017.
APA	Mao XiaoHong,Zhang JianXin,Yu ShengYao,Li YunShuai,Yu XingXing,&Lu ZengLong.(2017).Early Paleozoic granulite-facies metamorphism and anatexis in the northern West Qinling orogen: Monazite and zircon U-Pb geochronological constraints.SCIENCE CHINA-EARTH SCIENCES.
MLA	Mao XiaoHong,et al."Early Paleozoic granulite-facies metamorphism and anatexis in the northern West Qinling orogen: Monazite and zircon U-Pb geochronological constraints".SCIENCE CHINA-EARTH SCIENCES (2017).