Contrasting P-T-t paths from a Paleoproterozoic metamorphic orogen: Petrology, phase equilibria, zircon and monazite geochronology of metapelites from the Jiao-Liao-Ji belt, North China Craton
文献类型：期刊论文
| 作者 | Zou, Yi1,2; Zhai, Mingguo1,3; Santosh, M.4,5; Zhou, Ligang1; Zhao, Lei1; Lu, Junsheng3; Liu, Bo1,2; Shan, Houxiang1,2 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2018-07-01 |
| 卷号 | 311页码:74-97 |
| 关键词 | Jiao-Liao-Ji belt P-T-X pseudosections Slow cooling Orogenic collapse Contrasting P-T-t paths |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2018.04.010 |
| 英文摘要 | The Paleoproterozoic metapelites within the major collisional orogenic belts of the North China Craton are generally characterized by clockwise metamorphic P-T-t paths. Here we report the case where an isobaric cooling followed by a final decompression is defined from high grade metapelites in the Jingshan Group at the southern part of the Jiao-Liao-Ji belt. The earlier prograde trajectory is constrained to be considerable heating with slight pressure increase to the peak metamorphism of 7.9-9.2 kbar at 763-770 degrees C by integrated methods of petrology, geothermobarometry and P-T-X pseudosection, suggesting an anticlockwise P-T path. Zircon and monazite geochronology combined with previous data suggests that the prograde metamorphism probably commenced at 1.90-1.85 Ga, followed by a slow isobaric cooling at mid-crustal level during 1.85-1.80 Ga and a final exhumation to upper crustal level presumable at 1.60-1.70 Ga. The defined P-T-t path seems to contrast with previously reported clockwise P-T-t paths. In the light of available geological evidence and recent numerical modelling, these contrasting P-T-t paths are reconciled by a tentative geodynamic model in which orogenic collapse and hot exhumation of the orogenic root during 1.90-1.85 Ga resulted in isothermal decompression of the granulites with clockwise P-T paths and triggered the prograde metamorphism for those regions displaying anticlockwise P-T paths. The pressure increase in the prograde trajectory of anticlockwise P-T path may be related to the sinking of upper-middle crustal materials to compensate for the contemporaneous ascend of the hot orogenic root. Subsequently, rocks of these contrasting P-T paths experienced a common slow isobaric cooling during 1.85-1.80 Ga. The 1.95-1.90 Ga metamorphic ages that are common in the Paleoproterozoic khondalitic rocks elsewhere in the NCC are absent in our samples can be ascribed to the high-temperature metamorphism related to this orogenic collapse and subsequent slow cooling. Therefore, our new data further supports that the JLJB is a long-lived collisional orogenic belt with post-orogenic extension at 1.90-1.85 Ga and subsequent slow cooling during 1.85-1.80 Ga. Hence, this study provides new metamorphic constraint on the post-orogenic evolution of the JLJB and insights into the mechanism of generating contrasting P-T-t paths in regional metamorphic orogens. |
| WOS关键词 | PRESSURE PELITIC GRANULITES ; LU-HF ISOTOPES ; GARNET-BIOTITE GEOTHERMOMETER ; PARTIAL MELTING EQUILIBRIA ; TEMPERATURE TIME PATHS ; U-PB ; CRUSTAL EVOLUTION ; EASTERN BLOCK ; TECTONIC IMPLICATIONS ; REGIONAL METAMORPHISM |
| 资助项目 | 973 Program[2012CB416606] ; National Natural Science Foundation of China[41202139] ; National Natural Science Foundation of China[41530208] ; National Natural Science Foundation of China[41210003] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000435621700005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | 973 Program ; 973 Program ; 973 Program ; 973 Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 973 Program ; 973 Program ; 973 Program ; 973 Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 973 Program ; 973 Program ; 973 Program ; 973 Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 973 Program ; 973 Program ; 973 Program ; 973 Program ; 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/132A11/88176]  |
| 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 | Zhai, Mingguo |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100029, Peoples R China 4.Univ Adelaide, Dept Earth Sci, Adelaide, SA 5005, Australia 5.China Univ Geosci, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zou, Yi,Zhai, Mingguo,Santosh, M.,et al. Contrasting P-T-t paths from a Paleoproterozoic metamorphic orogen: Petrology, phase equilibria, zircon and monazite geochronology of metapelites from the Jiao-Liao-Ji belt, North China Craton[J]. PRECAMBRIAN RESEARCH,2018,311:74-97. |
| APA | Zou, Yi.,Zhai, Mingguo.,Santosh, M..,Zhou, Ligang.,Zhao, Lei.,...&Shan, Houxiang.(2018).Contrasting P-T-t paths from a Paleoproterozoic metamorphic orogen: Petrology, phase equilibria, zircon and monazite geochronology of metapelites from the Jiao-Liao-Ji belt, North China Craton.PRECAMBRIAN RESEARCH,311,74-97. |
| MLA | Zou, Yi,et al."Contrasting P-T-t paths from a Paleoproterozoic metamorphic orogen: Petrology, phase equilibria, zircon and monazite geochronology of metapelites from the Jiao-Liao-Ji belt, North China Craton".PRECAMBRIAN RESEARCH 311(2018):74-97. |
入库方式： OAI收割
来源：地质与地球物理研究所
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