Cenozoic ultrahigh-temperature metamorphism in pelitic granulites from the Mogok metamorphic belt, Myanmar
文献类型：期刊论文
| 作者 | Chen, Si2,3,4; Chen, Yi1,2,3,4; Li, Yibing2,3,4; Su, Bin2,3; Zhang, Qinghua2,3,4; Aung, Me Me5; Sein, Kyaing6 |
| 刊名 | SCIENCE CHINA-EARTH SCIENCES
 |
| 出版日期 | 2021-11-01 |
| 卷号 | 64期号:11页码:1873-1892 |
| 关键词 | Mogok metamorphic belt Ultrahigh-temperature metamorphism Pelitic granulites Zr-in-rutile thermometry Zircon chronology |
| ISSN号 | 1674-7313 |
| DOI | 10.1007/s11430-020-9748-5 |
| 英文摘要 | Ultrahigh-temperature (UHT) metamorphism is critical for understanding the most extreme thermal evolution of continental crust. However, UHT metamorphism predominantly occurred in the Precambrian and is rarely observed in the modern Earth. Here, we report the discovery of similar to 25 Ma UHT granulites from the Mogok metamorphic belt (MMB) in Myanmar via a combined study of petrology and geochronology. The studied pelitic granulites well preserve a peak mineral assemblage of garnet + sillimanite + plagioclase (antiperthite) + K-feldspar + quartz + Ti-rich biotite + rutile + ilmenite. Pressure (P)-temperature (T) pseudosections and conventional geothermobarometry data only constrain the P-T conditions of the peak stage to <12 kbar and 780-890 degrees C. However, high Zr contents in the matrix rutile (3005-4308 ppm) and high Ti contents (up to 9.2 wt% TiO2) in the biotite demonstrate that the Mogok granulites may have experienced UHT metamorphism. The Zr-in-rutile thermometer and X-Grs isopleth in the pseudosections yield peak P-T conditions of similar to 12 kbar and >900 degrees C. In situ SIMS and LA-ICP-MS U-Pb dating and trace element analyses show that both metamorphic zircon cores and rims have flat heavy rare earth element (HREE) patterns with negative Eu anomalies. The metamorphic zircon rims show the lowest HREE contents and yield Pb-206/U-238 ages of 24.9 +/- 0.5 and 25.4 +/- 0.6 Ma, respectively, representing the timing of UHT metamorphism. Our results indicate that the central MMB underwent similar to 25 Ma UHT metamorphism, which is possibly induced by continental rifting along the thinned orogenic lithosphere. Our data, as well as reported Cenozoic UHT events, further suggest that UHT metamorphism can be produced in the modern plate tectonic regime by lithospheric extension. |
| WOS关键词 | ZR-IN-RUTILE ; U-PB GEOCHRONOLOGY ; MINERAL EQUILIBRIA CALCULATIONS ; TRACE-ELEMENT SYSTEMATICS ; EAST-WEST EXTENSION ; PHASE-EQUILIBRIA ; HIGH-PRESSURE ; ENDERBY LAND ; PLUS QUARTZ ; CONTINENTAL COLLISION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000713627200004 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/103796]  |
| 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 | Chen, Yi |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Earth Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Myitkyina Univ, Geol Dept, Myitkyina 01012, Kachin State, Myanmar 6.Hlaing Univ Campus, Myanmar Geosci Soc, Yangon 11062, Myanmar |
| 推荐引用方式 GB/T 7714 | Chen, Si,Chen, Yi,Li, Yibing,et al. Cenozoic ultrahigh-temperature metamorphism in pelitic granulites from the Mogok metamorphic belt, Myanmar[J]. SCIENCE CHINA-EARTH SCIENCES,2021,64(11):1873-1892. |
| APA | Chen, Si.,Chen, Yi.,Li, Yibing.,Su, Bin.,Zhang, Qinghua.,...&Sein, Kyaing.(2021).Cenozoic ultrahigh-temperature metamorphism in pelitic granulites from the Mogok metamorphic belt, Myanmar.SCIENCE CHINA-EARTH SCIENCES,64(11),1873-1892. |
| MLA | Chen, Si,et al."Cenozoic ultrahigh-temperature metamorphism in pelitic granulites from the Mogok metamorphic belt, Myanmar".SCIENCE CHINA-EARTH SCIENCES 64.11(2021):1873-1892. |
入库方式： OAI收割
来源：地质与地球物理研究所
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