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| DOI | 10.1016/j.lithos.2024.107550 |
| Early Paleozoic metamorphism and anatexis of lower retro-/back-arc crust in the western Central Qilian belt, NE Tibet | |
| 发表日期 | 2024 |
| ISSN | 0024-4937 |
| EISSN | 1872-6143 |
| 起始页码 | 472 |
| 卷号 | 472 |
| 英文摘要 | The tectonic-thermal mechanism of crustal melting provides vital information on continental differentiation and orogenic evolution. This study aims to understand the evolution and tectonic setting of newly discovered lower crustal leucosome-rich granulites of the Qilian Orogen, NW China. Tonalitic leucosome within garnet amphibolite occurs in net-like arrays or as stringers and has diffuse boundaries with the host, with enriched LILE, and high Sr and Sr/Y ratios, similar to that of adakite, formed by water-fluxed melting. However, granitic leucosome within garnet granitic gneiss shows sharp contacts with the host, and has low Sr, Ba, K and Pb but high Rb, Rb/Sr, with negative Eu anomalies, consistent with dehydration melting. Petrographic observations, geochemical data and pseudosection modelling suggest that garnet amphibolite experienced water-fluxed melting and garnet granitic gneiss underwent dehydration melting, respectively. LA-ICP-MS zircon and titanite dating indicate the anatectic event proceeded at -480-470 Ma. Phase equilibrium modelling suggests the garnet amphibolite and garnet granitic gneiss share a similar P-T path involving decompression heating from -12.1 kbar/711-746 degrees C to reach peak temperatures of 798-836 degrees C at 10.4 kbar, and subsequently decompression cooling to 4.6-7.6 kbar/ 600-672 degrees C. The calculated P-T conditions suggest Barrovian-type metamorphism with thermal gradients of 24.2 degrees C/km for the Central Qilian lower crust. We interpret a retro-/back-arc setting resulting from the southward subduction of the North Qilian oceanic lithosphere. |
| 英文关键词 | Central Qilian belt; Water -fluxed melting; Phase equilibrium modelling; Geochronology; Lower crust |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:001195839000001 |
| 来源期刊 | LITHOS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/299066 |
| 作者单位 | Northwest University Xi'an; Macquarie University; Yanan University; China Geological Survey; Xi'an Center, China Geological Survey |
| 推荐引用方式 GB/T 7714 | . Early Paleozoic metamorphism and anatexis of lower retro-/back-arc crust in the western Central Qilian belt, NE Tibet[J],2024,472. |
| APA | (2024).Early Paleozoic metamorphism and anatexis of lower retro-/back-arc crust in the western Central Qilian belt, NE Tibet.LITHOS,472. |
| MLA | "Early Paleozoic metamorphism and anatexis of lower retro-/back-arc crust in the western Central Qilian belt, NE Tibet".LITHOS 472(2024). |
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