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
文献类型：期刊论文
| 作者 | Jiao, Shujuan1,3; Guo, Jinghui1,2,3 |
| 刊名 | JOURNAL OF METAMORPHIC GEOLOGY
 |
| 出版日期 | 2020-02-19 |
| 页码 | 22 |
| 关键词 | Khondalite Belt North China Craton phase equilibria modelling sapphirine ultrahigh temperature |
| ISSN号 | 0263-4929 |
| DOI | 10.1111/jmg.12525 |
| 英文摘要 | Interpretation 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. |
| WOS关键词 | ULTRAHIGH-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 |
| 资助项目 | Youth Innovation Promotion Association of the Chinese Academy of Sciences[2018089] ; National Natural Science Foundation of China[41672189] ; National Natural Science Foundation of China[41890832] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000514234600001 |
| 出版者 | WILEY |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95641]  |
| 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.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 3.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,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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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