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

文献类型：期刊论文

作者Yang, Xiaoqiang1; Li, Zilong1; Wang, Huihui1; Chen, Hanlin1; Li, Yinqi1; Xiao, Wenjiao2
刊名ISLAND ARC
出版日期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
DOI10.1111/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)
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.

入库方式： OAI收割

来源：地质与地球物理研究所

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