Sapphirine-bearing granulites from the Tongbai orogen, China: Petrology, phase equilibria, zircon U-Pb geochronology and implications for Paleozoic ultrahigh temperature metamorphism

doi:10.1016/j.lithos.2014.08.017

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	Sapphirine-bearing granulites from the Tongbai orogen, China: Petrology, phase equilibria, zircon U-Pb geochronology and implications for Paleozoic ultrahigh temperature metamorphism
	Xiang, Hua 9; Zhong, Zeng-Qiu ; Li, Ye ; Qi, Min ; Zhou, Han-Wen ; Zhang, Li 6; Zhang, Ze-Ming ; Santosh, M.
刊名	LITHOS
	2014
卷号	208 页码:446-461
关键词	Sapphirine granulite Ultrahigh-temperature metamorphism U-Pb Geochronology Phase equilibrium modeling Tongbai orogen
ISSN号	0024-4937
DOI	10.1016/j.lithos.2014.08.017
英文摘要	We report here for the first time the occurrence of sapphirine-bearing granulites within the Qinling Group of the Qinling-Tongbai orogen and provide robust evidence for extreme crustal metamorphism at ultrahigh-temperature (UHT) conditions. We document the UHT indicator of sapphirine and spinel in a mafic granulite consisting of orthopyroxene, biotite, plagioclase, amphibole and rutile/ilmenite. The ferromagnesian minerals in the sapphirine-bearing granulite have high X-Mg [Mg/(Mg + Fe)] (orthopyroxene X-Mg = 0.84-0.95; biotite X-Mg = 0.81; amphibole X-Mg = 0.87-0.96). The phase equilibria modeling demonstrates that the early spinel-bearing assemblage is stable at 923-950 degrees C and 6.7-8.9 kbar, and the peak assemblage of Opx + Pl + Spr/Spl + Amp + Bt + Ilm (+ melt) defines a field at 922-947 degrees C and 8.4-102 kbar. Rutiles have variable Zr concentrations but mostly cluster at ca. 1,500 and 3400 ppm Zr-in-rutile geothermometry yielded high temperatures of up to 890-940 degrees C. Zircon U-Pb dating of the granulite constrains the timing of the immediate post-peak and retrograde metamorphic stages as 429 +/- 7 Ma and 412 +/- 4 Ma, respectively. The UHT metamorphism, together with extensive occurrence of coeval magmatic suites suggests that the Tongbai orogen experienced a Paleozoic Andean-type orogeny probably derived from mid-oceanic ridge subduction of the Qinling Ocean. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	LA-ICP-MS ; PLUS QUARTZ ASSEMBLAGE ; IN-RUTILE THERMOMETRY ; QINLING-DABIE OROGEN ; NORTH CHINA ; TECTONIC EVOLUTION ; CONTINENTAL COLLISION ; CRUSTAL METAMORPHISM ; FACIES METAMORPHISM ; THERMODYNAMIC MODEL
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000345179900028
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40498]
专题	中国地质调查局西安地质调查中心
作者单位	1.[Xiang, Hua 2.Qi, Min 3.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 4.Zhong, Zeng-Qiu 5.Li, Ye 6.Zhou, Han-Wen 7.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 8.[Santosh, M.] China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 9.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Xiang, Hua,Zhong, Zeng-Qiu,Li, Ye,et al. Sapphirine-bearing granulites from the Tongbai orogen, China: Petrology, phase equilibria, zircon U-Pb geochronology and implications for Paleozoic ultrahigh temperature metamorphism[J]. LITHOS,2014,208:446-461.
APA	Xiang, Hua.,Zhong, Zeng-Qiu.,Li, Ye.,Qi, Min.,Zhou, Han-Wen.,...&Santosh, M..(2014).Sapphirine-bearing granulites from the Tongbai orogen, China: Petrology, phase equilibria, zircon U-Pb geochronology and implications for Paleozoic ultrahigh temperature metamorphism.LITHOS,208,446-461.
MLA	Xiang, Hua,et al."Sapphirine-bearing granulites from the Tongbai orogen, China: Petrology, phase equilibria, zircon U-Pb geochronology and implications for Paleozoic ultrahigh temperature metamorphism".LITHOS 208(2014):446-461.