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SHRIMP U-Pb zircon chronology of ultrahigh-temperature spinel-orthopyroxene-garnet granulite from South Altay orogenic belt, northwestern China

文献类型：期刊论文

作者Li, Zilong1; Li, Yinqi1; Chen, Hanlin1; Santosh, M.2; Xiao, Wenjiao3; Wang, Huihui1
刊名ISLAND ARC
出版日期2010-09-01
卷号19期号:3页码:506-516
关键词Mineral Reaction Zircon Shrimp U-pb Age Dating Tectonometamorphic Evolution Ultrahigh-temperature Granulite South Altay Orogenic Belt
ISSN号1038-4871
DOI10.1111/j.1440-1738.2010.00726.x
文献子类Article
英文摘要Diagnostic mineral assemblages, mineral compositions and zircon SHRIMP U-Pb ages are reported from an ultrahigh-temperature (UHT) spinel-orthopyroxene-garnet granulite (UHT rock) from the South Altay orogenic belt of northwestern China. This Altay orogenic belt defines an accretionary belt between the Siberian and Kazakhstan-Junggar Plates that formed during the Paleozoic. The UHT rock examined in this study preserves both peak and retrograde metamorphic assemblages and microstructures including equilibrium spinel + quartz, and intergrowth of orthopyroxene, spinel, sillimanite, and cordierite formed during decompression. Mineral chemistry shows that the spinel coexisting with quartz has low ZnO contents, and the orthopyroxene is of high alumina type with Al(2)O(3) contents up to 9.3 wt%. The peak temperatures of metamorphism were > 950 degrees C, consistent with UHT conditions, and the rocks were exhumed along a clockwise P-T path. The zircons in this UHT rock display a zonal structure with a relict core and metamorphic rim. The cores yield bimodal ages of 499 +/- 8 Ma (7 spots), and 855 Ma (2 spots), with the rounded clastic zircons having ages with 490-500 Ma. Since the granulite was metamorphosed at temperatures > 900 degrees C, exceeding the closure temperature of U-Pb system in zircon, a possible interpretation is that the 499 +/- 8 Ma age obtained from the largest population of zircons in the rock marks the timing of formation of the protolith of the rock, with the zircons sourced from a similar to 500 Ma magmatic provenance, in a continental margin setting. We correlate the UHT metamorphism with the northward subduction of the Paleo-Asian Ocean and associated accretion-collision tectonics of the Siberian and Kazakhstan-Junggar Plates followed by rapid exhumation leading to decompression.
WOS关键词CRUSTAL METAMORPHISM ; QUARTZ ASSEMBLAGES ; TECTONIC EVOLUTION ; NORTHERN XINJIANG ; NW CHINA ; GROWTH ; GEOTHERMOBAROMETRY ; CONSTRAINTS ; EQUILIBRIA ; CRATON
WOS研究方向Geology
语种英语
WOS记录号WOS:000281407500011
出版者WILEY-BLACKWELL
资助机构National Key Project for Basic Research of China(2007CB411303 ; National Key Project for Basic Research of China(2007CB411303 ; Natural Scientific Foundation of China(40972045 ; Natural Scientific Foundation of China(40972045 ; 2001CB409801 ; 2001CB409801 ; 41072048 ; 41072048 ; 2011CB808902) ; 2011CB808902) ; 40472040 ; 40472040 ; 40930315 ; 40930315 ; 40472120 ; 40472120 ; 40725007) ; 40725007) ; National Key Project for Basic Research of China(2007CB411303 ; National Key Project for Basic Research of China(2007CB411303 ; Natural Scientific Foundation of China(40972045 ; Natural Scientific Foundation of China(40972045 ; 2001CB409801 ; 2001CB409801 ; 41072048 ; 41072048 ; 2011CB808902) ; 2011CB808902) ; 40472040 ; 40472040 ; 40930315 ; 40930315 ; 40472120 ; 40472120 ; 40725007) ; 40725007) ; National Key Project for Basic Research of China(2007CB411303 ; National Key Project for Basic Research of China(2007CB411303 ; Natural Scientific Foundation of China(40972045 ; Natural Scientific Foundation of China(40972045 ; 2001CB409801 ; 2001CB409801 ; 41072048 ; 41072048 ; 2011CB808902) ; 2011CB808902) ; 40472040 ; 40472040 ; 40930315 ; 40930315 ; 40472120 ; 40472120 ; 40725007) ; 40725007) ; National Key Project for Basic Research of China(2007CB411303 ; National Key Project for Basic Research of China(2007CB411303 ; Natural Scientific Foundation of China(40972045 ; Natural Scientific Foundation of China(40972045 ; 2001CB409801 ; 2001CB409801 ; 41072048 ; 41072048 ; 2011CB808902) ; 2011CB808902) ; 40472040 ; 40472040 ; 40930315 ; 40930315 ; 40472120 ; 40472120 ; 40725007) ; 40725007)
源URL[http://ir.iggcas.ac.cn/handle/132A11/73325]  
专题中国科学院地质与地球物理研究所
通讯作者Li, Zilong
作者单位1.Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Peoples R China
2.Kochi Univ, Dept Nat Environm Sci, Kochi 7808520, Japan
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Li, Zilong,Li, Yinqi,Chen, Hanlin,et al. SHRIMP U-Pb zircon chronology of ultrahigh-temperature spinel-orthopyroxene-garnet granulite from South Altay orogenic belt, northwestern China[J]. ISLAND ARC,2010,19(3):506-516.
APA Li, Zilong,Li, Yinqi,Chen, Hanlin,Santosh, M.,Xiao, Wenjiao,&Wang, Huihui.(2010).SHRIMP U-Pb zircon chronology of ultrahigh-temperature spinel-orthopyroxene-garnet granulite from South Altay orogenic belt, northwestern China.ISLAND ARC,19(3),506-516.
MLA Li, Zilong,et al."SHRIMP U-Pb zircon chronology of ultrahigh-temperature spinel-orthopyroxene-garnet granulite from South Altay orogenic belt, northwestern China".ISLAND ARC 19.3(2010):506-516.

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来源：地质与地球物理研究所

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