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Paleoproterozoic ultrahigh-temperature metamorphism in the Alxa Block, the Khondalite Belt, North China Craton: Petrology and phase equilibria of quartz-absent corundum-bearing pelitic granulites

文献类型：期刊论文

作者Zou, Lei1,2,3,4; Jing-Hui Guo1,2,3; Shu-Juan Jiao1,3; Guang-Yu Huang1,3; Zhong-Hua Tian4; Ping-Hua Liu4
刊名JOURNAL OF METAMORPHIC GEOLOGY
出版日期2022-03-25
页码29
关键词Alxa block corundum phase equilibrium modelling quartz-absent ultrahigh-temperature metamorphism
ISSN号0263-4929
DOI10.1111/jmg.12661
英文摘要An Al-rich, quartz-absent corundum-bearing pelitic granulite is reported for the first time at the Diebusige complex in the Alxa Block in the western part of the Khondalite Belt (KB), North China Craton (NCC). A detailed petrographic study shows that a quartz-present domain occurs in porphyroblastic garnet cores from the corundum-bearing pelitic granulite, with a prograde metamorphic mineral assemblage (M-1) of garnet + plagioclase + quartz + biotite + spinel + rutile +/- melt, and a quartz-absent domain occurs in the matrix of this rock, with a preserved peak mineral assemblage (M-2) of garnet + corundum + spinel + biotite + plagioclase + K-feldspar + rutile + melt and a retrograde metamorphic mineral assemblage (M-3) of garnet + sillimanite + corundum + biotite + plagioclase + K-feldspar +/- rutile. Phase equilibrium modelling and Zr-in-rutile and ternary feldspar thermometry all reveal similar peak conditions of 890-940 degrees C at 7.5-9.8 kbar, which indicate a high geothermal gradient of similar to 110 degrees C/kbar and ultrahigh-temperature (UHT) conditions. Combining this information with the detailed analysis of metamorphic zircons, we obtain the metamorphic evolution of the corundum-bearing pelitic granulite. Specifically, the corundum-bearing pelitic granulite experienced granulite-facies metamorphism at similar to 1950 Ma. Then, this rock was slowly uplifted with heating and partial melting until it achieved UHT conditions. Finally, it cooled to the solidus at similar to 1830 Ma. Thus, we propose that the UHT metamorphic conditions of a corundum-bearing pelitic granulite from the Diebusige complex of the Alxa Block may be the result of long-term slow uplift with heating under a high geothermal gradient.
WOS关键词U-PB GEOCHRONOLOGY ; CENTRAL MAINE TERRANE ; RARE-EARTH-ELEMENTS ; HIGH-PRESSURE ; PLUS QUARTZ ; METAPELITIC GRANULITES ; HELANSHAN COMPLEX ; WESTERN BLOCK ; TECTONOTHERMAL EVENTS ; FELDSPAR THERMOMETRY
资助项目Geological Investigation Project of the China Geological Survey[DD20190370] ; Geological Investigation Project of the China Geological Survey[DD20190003] ; Geological Investigation Project of the China Geological Survey[DD20221649] ; National Natural Science Foundation of China[41672191] ; National Natural Science Foundation of China[41890832] ; National Natural Science Foundation of China[41972205]
WOS研究方向Geology
语种英语
WOS记录号WOS:000772913000001
出版者WILEY
资助机构Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; Geological Investigation Project of the China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/105037]  
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Ping-Hua Liu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
4.Chinese Acad Geol Sci, Inst Geol, 26 Baiwanzhuang Rd, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Zou, Lei,Jing-Hui Guo,Shu-Juan Jiao,et al. Paleoproterozoic ultrahigh-temperature metamorphism in the Alxa Block, the Khondalite Belt, North China Craton: Petrology and phase equilibria of quartz-absent corundum-bearing pelitic granulites[J]. JOURNAL OF METAMORPHIC GEOLOGY,2022:29.
APA Zou, Lei,Jing-Hui Guo,Shu-Juan Jiao,Guang-Yu Huang,Zhong-Hua Tian,&Ping-Hua Liu.(2022).Paleoproterozoic ultrahigh-temperature metamorphism in the Alxa Block, the Khondalite Belt, North China Craton: Petrology and phase equilibria of quartz-absent corundum-bearing pelitic granulites.JOURNAL OF METAMORPHIC GEOLOGY,29.
MLA Zou, Lei,et al."Paleoproterozoic ultrahigh-temperature metamorphism in the Alxa Block, the Khondalite Belt, North China Craton: Petrology and phase equilibria of quartz-absent corundum-bearing pelitic granulites".JOURNAL OF METAMORPHIC GEOLOGY (2022):29.

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来源：地质与地球物理研究所

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