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| DOI | 10.18654/1000.0569/2023.12.03 |
| Genetic mechanism of the Kongbugang Miocene leucogranite in the Cona area, southern Tibet | |
| Wang Rui; Gao Lie; Zeng LingSen; Yan LiLong; Di YingLong | |
| 发表日期 | 2023 |
| ISSN | 1000-0569 |
| EISSN | 2095-8927 |
| 起始页码 | 3555 |
| 结束页码 | 3571 |
| 卷号 | 39期号:12 |
| 英文摘要 | The Kongbugang granite pluton is located within the Sangri-Cuona rift system in the eastern part of the Tethys Himalayan belt. It consists of various types of leucogranites, including two -mica granite, muscovite leucogranite, garnet -bearing leucogranite and leucosome. LA-MC-ICP-MS zircon U-Pb dating results show that the Kongbugang muscovite leucogranite was formed at 16. +/- 0. 1Ma. Geochemical analysis data indicate that the two -mica granites are Na-rich and peraluminous granites with high Sr (107 x 10(-6) -141 x 10(-6)) and Ba (230 x10(-6) -311 x10, but low Rb (108 x10(-6) -221 x10(-6)) and Rb/Sr ratio (0.78 -2.07). They are defined by nearly constant Rb/Sr ratio despite large variations in Ba concentrations, which is a distinctive feature of fluid -fluxed melting of muscovite. The muscovite leucogranites are K -rich and peraluminous granites with high Rb ( >270 x 10(-6)) and high Rb/Sr ratio (5. 2 -9. 5), but low Sr ( <58. 5 x10(-6)) and Ba ( <167 x10(-6)). The Ba contents are negatively correlated with Rb/Sr ratios, which is considered to be a typical characteristic of fluid -absent melting of muscovite. The garnet -bearing leucogranites have significant Ba, Th, Nb, Ta, P, Sr, Eu, Zr and Ti negative anomalies and highly correlated relationships between different trace element contents, which indicates that they are the product from granitic melt by fractional crystallization of zircon, plagioclase and mica. The leucosomes have high SiO2, K2O, TiO2, Ba, Nb, Ta, Zr, Hf contents, and enriched in light rare earth elements or heavy rare earth elements with significant positive Eu anomalies. During the formation of the leucosomes, inherited accessory minerals ( such as zircon, monazite, garnet and Ti -rich minerals) and peritectic feldspar were captured from the source rocks. Combined with the published data in the Cuona area, we can infer that the Miocene leucogranite in Kongbugang region is related to the initiation of the Sangri-Cuona rift. The fluid released from the Lesser Himalayan Sequence rose through the rift system and promoted fluid -fluxed melting of muscovite within the High Himalayan Crystalline Series. The initiated time of the Sangri-Cuona rift should be no later than 22. 5Ma. |
| 关键词 | The Himalayan orogenKongbugangLeucograniteCrustal anatexisFractional crystallization |
| 英文关键词 | HIMALAYAN LEUKOGRANITES; DOME; CRYSTALLIZATION; FRACTIONATION; METAMORPHISM; TECTONICS; MAGMATISM; EXTRUSION; OLIGOCENE; ANATEXIS |
| WOS研究方向 | Geology |
| WOS记录号 | WOS:001152994000003 |
| 来源期刊 | ACTA PETROLOGICA SINICA
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/283410 |
| 作者单位 | China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences |
| 推荐引用方式 GB/T 7714 | Wang Rui,Gao Lie,Zeng LingSen,et al. Genetic mechanism of the Kongbugang Miocene leucogranite in the Cona area, southern Tibet[J],2023,39(12). |
| APA | Wang Rui,Gao Lie,Zeng LingSen,Yan LiLong,&Di YingLong.(2023).Genetic mechanism of the Kongbugang Miocene leucogranite in the Cona area, southern Tibet.ACTA PETROLOGICA SINICA,39(12). |
| MLA | Wang Rui,et al."Genetic mechanism of the Kongbugang Miocene leucogranite in the Cona area, southern Tibet".ACTA PETROLOGICA SINICA 39.12(2023). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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