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Texturally Controlled U-Th-Pb Monazite Geochronology Reveals Paleoproterozoic UHT Metamorphic Evolution in the Khondalite Belt, North China Craton

文献类型：期刊论文

作者Jiao, Shujuan3,4,5; Fitzsimons, Ian C. W.3; Zi, Jian-Wei1,2; Evans, Noreen J.2,3; Mcdonald, Brad J.2; Guo, Jinghui4,5
刊名JOURNAL OF PETROLOGY
出版日期2020
卷号61期号:1页码:20
关键词geochronology Khondalite Belt monazite North China Craton UHT
ISSN号0022-3530
DOI10.1093/petrology/egaa023
英文摘要Sapphirine-bearing UHT granulites from the Dongpo locality in the Khondalite Belt of the North China Craton have been comprehensively characterized in terms of petrology, mineral chemistry, metamorphic evolution and zircon geochronology. However, the precise timing of the peak-UHT metamorphism and other key stages in the P-T-t evolution remain controversial due to the complexity of multiple metamorphic overprints and the lack of petrographic context for zircon age data. In this study, monazite from four samples of the Dongpo granulite are divided into six groups based on chemical composition and textural context, and dated (in-situ SHRIMP and LA-ICP-MSU-Pb). An age population of 1.91-1.88 Ga was obtained from high-Y cores of monazite inclusions in garnet (Group 1) and on grains in the rock matrix (Group 2). The maximum age of c.1.91 Ga is interpreted as the minimum timing for prograde metamorphism before UHT metamorphism (M1). An age population of 1.90-1.85 Ga was obtained from low-Y domains of monazite inclusions (Group 3) and of matrix grains (Group 4). Combined with previous zircon dating results, the age population from low-Y Mnz constrains the timing and duration of the UHT metamorphism to 1.901.85 Ga and 50 (+/- 15) million years, respectively. The large (50 m.y.) age spread is interpreted to reflect continuous monazite formation, and it is consistent with the slow post-peak near-isobaric cooling stage (M2). An age of c.1.86 Ga was obtained from monazite in textural contact with sapphirine/spinel + plagioclase intergrowths (Group 5), which is interpreted as the timing of the subsequent decompression-heating stage (M3). The younger age clusters at c.1.80 and 1.77 Ga, obtained from Th-rich monazite rims (Group 6) and one single Th-depleted monazite in textural contact with matrix biotite, respectively, indicate dissolution-reprecipitation and new monazite growth from fluid released by crystallizing anatectic melt during retrogression. These results, along with the previous 1.93-1.91 Ga data for UHT metamorphism, suggest that there was a very long-lived Paleoproterozoic UHT metamorphism (1.93-1.85 Ga) in the Khondalite Belt of the North China Craton. This supports the large hot orogeny model for the generation of Paleoproterozoic UHT metamorphism in the Khondalite Belt during the amalgamation of the Nuna supercontinent.
WOS关键词ULTRAHIGH-TEMPERATURE METAMORPHISM ; GRANULITE-FACIES METAMORPHISM ; PRESSURE PELITIC GRANULITES ; DAQINGSHAN-WULASHAN COMPLEX ; HIGH-GRADE METAMORPHISM ; MONGOLIA SUTURE ZONE ; INNER-MONGOLIA ; WESTERN BLOCK ; TECTONIC EVOLUTION ; HELANSHAN COMPLEX
资助项目Natural Science Foundation of China (NSFC)[41672189] ; Natural Science Foundation of China (NSFC)[41890832] ; Youth Innovation Promotion Association CAS[2018089] ; Australian Research Council[DP150102773]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000593092900006
出版者OXFORD UNIV PRESS
资助机构Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Research Council ; Australian Research Council ; Australian Research Council ; Australian Research Council ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Research Council ; Australian Research Council ; Australian Research Council ; Australian Research Council ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Research Council ; Australian Research Council ; Australian Research Council ; Australian Research Council ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Natural Science Foundation of China (NSFC) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Research Council ; Australian Research Council ; Australian Research Council ; Australian Research Council
源URL[http://ir.iggcas.ac.cn/handle/132A11/98670]  
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Jiao, Shujuan
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.Curtin Univ, John de Laeter Ctr, Kent St, Bentley, WA 6102, Australia
3.Curtin Univ, Sch Earth & Planetary Sci, Kent St, Bentley, WA 6102, Australia
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Jiao, Shujuan,Fitzsimons, Ian C. W.,Zi, Jian-Wei,et al. Texturally Controlled U-Th-Pb Monazite Geochronology Reveals Paleoproterozoic UHT Metamorphic Evolution in the Khondalite Belt, North China Craton[J]. JOURNAL OF PETROLOGY,2020,61(1):20.
APA Jiao, Shujuan,Fitzsimons, Ian C. W.,Zi, Jian-Wei,Evans, Noreen J.,Mcdonald, Brad J.,&Guo, Jinghui.(2020).Texturally Controlled U-Th-Pb Monazite Geochronology Reveals Paleoproterozoic UHT Metamorphic Evolution in the Khondalite Belt, North China Craton.JOURNAL OF PETROLOGY,61(1),20.
MLA Jiao, Shujuan,et al."Texturally Controlled U-Th-Pb Monazite Geochronology Reveals Paleoproterozoic UHT Metamorphic Evolution in the Khondalite Belt, North China Craton".JOURNAL OF PETROLOGY 61.1(2020):20.

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来源：地质与地球物理研究所

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