Petrology and geochemistry of ultrahigh-temperature granulites from the South Altay orogenic belt, northwestern China: Implications for metamorphic evolution and protolith composition

doi:10.1111/iar.12102

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Petrology and geochemistry of ultrahigh-temperature granulites from the South Altay orogenic belt, northwestern China: Implications for metamorphic evolution and protolith composition
	Yang, Xiaoqiang 1; Li, Zilong 1; Wang, Huihui 1; Chen, Hanlin 1; Li, Yinqi 1; Xiao, Wenjiao 2
刊名	ISLAND ARC
	2015-06-01
卷号	24 期号:2 页码:169-187
关键词	geochemistry mineral characteristics provenance reconstruction P-T estimate South Altay orogenic belt ultrahigh-temperature granulite
DOI	10.1111/iar.12102
文献子类	Article
英文摘要	Ultrahigh-temperature (UHT) granulites in the South Altay orogenic belt of Northwestern China provide important clues for the lower crustal components and tectonic evolution of the Central Asian Orogenic Belt during the Paleozoic. In this paper, we studied whole-rock geochemistry and mineral characteristics to understand the protolith and metamorphic evolution of the Altay UHT granulite. The Altay granulite shows negative discriminant function values (DF) of -9.27 to -3.95, indicating a sedimentary origin, probably an argillaceous rock. The peak metamorphic temperature-pressure conditions of 920-1010 degrees C and >9kbar were estimated from the geothermobarometry, together with the stability of spinel (low ZnO)+quartz and orthopyroxene (Al2O3 up to 9.2 wt.%)+sillimanite+quartz in the Altay UHT rock, indicate a UHT metamorphic condition has been achieved. Two stages of retrograde conditions are recognized in these rocks; the first is an isothermal decompression to approx. 750 degrees C at 5.2-5.8kbar at the early stage, and the second is the cooling down to 520-550 degrees C at 4.8-5.2kbar. Combined with previous study, the formation of the Altay UHT pelitic granulite with a clockwise retrograde P-T path is inferred to be related with collisional and accretional orogenic process between the Siberian and Kazakhstan-Junggar plates.
WOS关键词	ORTHO-PYROXENE ; TECTONIC EVOLUTION ; CRUSTAL METAMORPHISM ; SEDIMENTARY-ROCKS ; U-PB ; ACCRETIONARY OROGENESIS ; PHASE-RELATIONS ; NAPIER COMPLEX ; PELITIC ROCKS ; CENTRAL-ASIA
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000357300000006
资助机构	NSF of China(40972045 ; NSF of China(40972045 ; Doctoral Program of Higher Education of the Ministry of Education of China(20110101110001) ; Doctoral Program of Higher Education of the Ministry of Education of China(20110101110001) ; 41072048) ; 41072048) ; NSF of China(40972045 ; NSF of China(40972045 ; Doctoral Program of Higher Education of the Ministry of Education of China(20110101110001) ; Doctoral Program of Higher Education of the Ministry of Education of China(20110101110001) ; 41072048) ; 41072048)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62335]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Yang, Xiaoqiang,Li, Zilong,Wang, Huihui,et al. Petrology and geochemistry of ultrahigh-temperature granulites from the South Altay orogenic belt, northwestern China: Implications for metamorphic evolution and protolith composition[J]. ISLAND ARC,2015,24(2):169-187.
APA	Yang, Xiaoqiang,Li, Zilong,Wang, Huihui,Chen, Hanlin,Li, Yinqi,&Xiao, Wenjiao.(2015).Petrology and geochemistry of ultrahigh-temperature granulites from the South Altay orogenic belt, northwestern China: Implications for metamorphic evolution and protolith composition.ISLAND ARC,24(2),169-187.
MLA	Yang, Xiaoqiang,et al."Petrology and geochemistry of ultrahigh-temperature granulites from the South Altay orogenic belt, northwestern China: Implications for metamorphic evolution and protolith composition".ISLAND ARC 24.2(2015):169-187.