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Paleoproterozoic UHT metamorphism with isobaric cooling (IBC) followed by decompression-heating in the Khondalite Belt (North China Craton): New evidence from two sapphirine formation processes
Jiao, Shujuan1,2; Guo, Jinghui1,2,3
2020-02-19
Source PublicationJOURNAL OF METAMORPHIC GEOLOGY
ISSN0263-4929
Pages22
AbstractInterpretation of reaction microstructures may provide constraints on the P-T path followed by rocks, with implications for the geodynamic evolution. Sapphirine generally occurs in diverse microstructures in ultrahigh-temperature (UHT) Mg-Al-rich granulites. Understanding multi-stage sapphirine formation processes and the resultant P-T path may provide insights into the cause of UHT metamorphism, which is otherwise under broad debate. Here, we investigate samples of UHT granulite containing two distinct types of sapphirine from the Dongpo locality in the Khondalite Belt, North China Craton, with the aim of understanding the processes of sapphirine formation and the metamorphic evolution of the host rocks. Petrographic observations show that early sapphirine, which occurs as coronas on spinel and as single porphyroblasts, formed together with biotite, sillimanite, and inclusion-rich garnet. Late symplectitic sapphirine along with fine-grained plagioclase and spinel plus plagioclase symplectites, formed by consumption of sillimanite, biotite, and garnet. Three pseudosections based on the bulk compositions of microdomains inferred to reflect spatially restricted equilibrium suggest that the rocks record near isobaric cooling (IBC) from 980 to 830oC at 0.9 GPa for early sapphirine formation, and decompression and heating to <= 0.7 GPa and 900oC for late sapphirine formation. Our study in combination with other metamorphic P-T and age information reveals the common occurrence of IBC paths and long duration (c. 1.93 to 1.86 Ga) regional UHT metamorphism in the Khondalite Belt, North China Craton. Locally, this is followed by decompression-heating paths at c. 1.86 Ga. The Palaeoproterozoic UHT metamorphism with long-lived IBC path in the Khondalite Belt, North China Craton supports large hot orogen model in the amalgamation of this part in the supercontinent Nuna.
KeywordKhondalite Belt North China Craton phase equilibria modelling sapphirine ultrahigh temperature
DOI10.1111/jmg.12525
Funding OrganizationYouth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordULTRAHIGH-TEMPERATURE METAMORPHISM ; PRESSURE PELITIC GRANULITES ; CALCULATED PHASE-EQUILIBRIA ; P-T PATH ; SILICA-UNDERSATURATED SAPPHIRINE ; PYROXENE-SILLIMANITE GRANULITES ; MONGOLIA SUTURE ZONE ; AL-RICH GRANULITES ; U-PB ; WESTERN BLOCK
Language英语
Funding ProjectYouth Innovation Promotion Association of the Chinese Academy of Sciences[2018089] ; National Natural Science Foundation of China[41672189] ; National Natural Science Foundation of China[41890832]
Funding OrganizationYouth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000514234600001
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95641
Collection岩石圈演化国家重点实验室
Corresponding AuthorJiao, Shujuan
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Jiao, Shujuan,Guo, Jinghui. Paleoproterozoic UHT metamorphism with isobaric cooling (IBC) followed by decompression-heating in the Khondalite Belt (North China Craton): New evidence from two sapphirine formation processes[J]. JOURNAL OF METAMORPHIC GEOLOGY,2020:22.
APA Jiao, Shujuan,&Guo, Jinghui.(2020).Paleoproterozoic UHT metamorphism with isobaric cooling (IBC) followed by decompression-heating in the Khondalite Belt (North China Craton): New evidence from two sapphirine formation processes.JOURNAL OF METAMORPHIC GEOLOGY,22.
MLA Jiao, Shujuan,et al."Paleoproterozoic UHT metamorphism with isobaric cooling (IBC) followed by decompression-heating in the Khondalite Belt (North China Craton): New evidence from two sapphirine formation processes".JOURNAL OF METAMORPHIC GEOLOGY (2020):22.
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