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Monazite behaviour during isothermal decompression in pelitic granulites: a case study from Dinggye, Tibetan Himalaya

文献类型：期刊论文

作者Wang, Jia-Min1,2; Wu, Fu-Yuan1,3; Rubatto, Daniela4; Liu, Shi-Ran5; Zhang, Jin-Jiang5; Liu, Xiao-Chi1; Yang, Lei1
刊名CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
出版日期2017-10-01
卷号172期号:10
关键词U-Th-Pb geochronology Monazite Isothermal decompression Granulite-facies Himalaya
ISSN号0010-7999
DOI10.1007/s00410-017-1400-y
文献子类Article
英文摘要Monazite is a key accessory mineral for metamorphic geochronology, but interpretation of its complex chemical and age zoning acquired during high-temperature metamorphism and anatexis remains a challenge. We investigate the petrology, pressure-temperature and timing of metamorphism in pelitic and psammitic granulites that contain monazite from the Greater Himalayan Crystalline Complex (GHC) in Dinggye, southern Tibet. These rocks underwent isothermal decompression from pressure of > 10 kbar to similar to 5 kbar at temperatures of 750-830 degrees C, and recorded three metamorphic stages at kyanite (M-1), sillimanite (M-2) and cordierite-spinel grade (M-3). Monazite and zircon crystals were dated by microbeam techniques either as grain separates or in thin sections. U-Th-Pb ages are linked to specific conditions of mineral growth on the basis of zoning patterns, trace element signatures, index mineral inclusions (melt inclusions, sillimanite and K-feldspar) in dated domains and textural relationships with co-existing minerals. The results show that inherited domains (500-400 Ma) are preserved in monazite even at granulite-facies conditions. Few monazites or zircon yield ages related to the M-1-stage (similar to 30-29 Ma), possibly corresponding to prograde melting by muscovite dehydration. During the early stage of isothermal decompression, inherited or prograde monazites in most samples were dissolved in the melt produced by biotite dehydration-melting. Most monazite grains crystallized from melt toward the end of decompression (M-3-stage, 21-19 Ma) and are chemically related to garnet breakdown reactions. Another peak of monazite growth occurred at final melt crystallization (similar to 15 Ma), and these monazite grains are unzoned and are homogeneous in composition. In a regional context, our pressure-temperature-time data constrains peak high-pressure metamorphism within the GHC to similar to 30-29 Ma in Dinggye Himalaya. Our results are in line with a meltassisted exhumation of the GHC rocks.
WOS关键词MAIN CENTRAL THRUST ; U-TH-PB ; GARNET-BIOTITE GEOTHERMOMETER ; EASTERN NEPAL HIMALAYA ; TI-IN-ZIRCON ; CHANNEL FLOW ; TRACE-ELEMENT ; TECTONIC IMPLICATIONS ; CENTRAL AUSTRALIA ; SOUTHERN TIBET
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000413578600001
出版者SPRINGER
资助机构National Natural Science Foundation of China(41602054 ; National Natural Science Foundation of China(41602054 ; China Postdoctoral Science Foundation(2015LH0002 ; China Postdoctoral Science Foundation(2015LH0002 ; China Geological Survey(201306010046) ; China Geological Survey(201306010046) ; 41402055 ; 41402055 ; 2016M600126) ; 2016M600126) ; 41130313) ; 41130313) ; National Natural Science Foundation of China(41602054 ; National Natural Science Foundation of China(41602054 ; China Postdoctoral Science Foundation(2015LH0002 ; China Postdoctoral Science Foundation(2015LH0002 ; China Geological Survey(201306010046) ; China Geological Survey(201306010046) ; 41402055 ; 41402055 ; 2016M600126) ; 2016M600126) ; 41130313) ; 41130313) ; National Natural Science Foundation of China(41602054 ; National Natural Science Foundation of China(41602054 ; China Postdoctoral Science Foundation(2015LH0002 ; China Postdoctoral Science Foundation(2015LH0002 ; China Geological Survey(201306010046) ; China Geological Survey(201306010046) ; 41402055 ; 41402055 ; 2016M600126) ; 2016M600126) ; 41130313) ; 41130313) ; National Natural Science Foundation of China(41602054 ; National Natural Science Foundation of China(41602054 ; China Postdoctoral Science Foundation(2015LH0002 ; China Postdoctoral Science Foundation(2015LH0002 ; China Geological Survey(201306010046) ; China Geological Survey(201306010046) ; 41402055 ; 41402055 ; 2016M600126) ; 2016M600126) ; 41130313) ; 41130313)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62001]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wang, Jia-Min
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44780 Bochum, Germany
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Univ Bern, Inst Geol Sci, CH-3012 Bern, Switzerland
5.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Jia-Min,Wu, Fu-Yuan,Rubatto, Daniela,et al. Monazite behaviour during isothermal decompression in pelitic granulites: a case study from Dinggye, Tibetan Himalaya[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2017,172(10).
APA Wang, Jia-Min.,Wu, Fu-Yuan.,Rubatto, Daniela.,Liu, Shi-Ran.,Zhang, Jin-Jiang.,...&Yang, Lei.(2017).Monazite behaviour during isothermal decompression in pelitic granulites: a case study from Dinggye, Tibetan Himalaya.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,172(10).
MLA Wang, Jia-Min,et al."Monazite behaviour during isothermal decompression in pelitic granulites: a case study from Dinggye, Tibetan Himalaya".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 172.10(2017).

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来源：地质与地球物理研究所

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