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| DOI | 10.3390/min14030282 |
| Petrogenesis and Tectonic Implications of the Oligocene Dalongtan Shoshonitic Syenite Porphyry in Central Yunnan, Southeastern Tibetan Plateau: Constraints from Geochronology, Geochemistry and Sr-Nd-Hf Isotopes | |
| 发表日期 | 2024 |
| EISSN | 2075-163X |
| 起始页码 | 14 |
| 结束页码 | 3 |
| 卷号 | 14期号:3 |
| 英文摘要 | Shoshonitic rocks are widely distributed in post-collisional settings and provide key information on deep geodynamic mechanisms and magmatic evolution. In this paper, we present petrographic, zircon U-Pb age-related, trace elemental, Hf isotopic, bulk-rock elemental, and Sr-Nd isotopic data of the Dalongtan shoshonitic syenite porphyries (DSSPs) in central Yunnan, southeastern Tibet. The DSSPs formed at 33.2 +/- 0.3 Ma in a post-collisional setting. They define linear trends on Harker diagrams, and they display similar trace element patterns and enriched bulk-rock Sr-Nd isotopes [(87Sr/86Sr)i = 0.70964-0.70968, epsilon Nd(t) = -12.9 to -12.7] and zircon Hf isotopes (epsilon Hf(t) = -15.7 to -13.1) to the coeval mantle-derived potassic mafic rocks. This suggests that the DSSPs were fractionated from the lithospheric mantle-derived mafic magmas. The DSSPs, along with the coeval felsic and mafic magmatic rocks (37.2-32.3 Ma), exhibit a planar distribution on the SE Tibet and predate the left-lateral shearing of the Ailaoshan-Red River shear zone (ARSZ) (32-22 Ma), suggesting that there are no genetic relationships between them. The DSSPs have geochemical characteristics similar to those of A-type granites, with high total alkalinity (10.39-11.17 wt.%), HFSE concentrations (Zr + Nb + Ce + Y = 890.2-1054.3 ppm), Ga/Al ratios (10,000 x Ga/Al = 2.95-3.46), whole-rock zircon saturation temperatures (906-947 degrees C), and oxygen fugacity (Delta FMQ = +3.30-+4.65), indicating that they are products of the high-temperature melting of the lithosphere as a result of asthenosphere upwelling in extensional settings. Based on our data and regional observations, it is proposed that the generation of the DSSPs may be linked to the convective thinning of the thickened lithospheric mantle following the India-Asia collision. |
| 英文关键词 | shoshonitic syenite porphyry; petrogenesis; convective thinning; central Yunnan; southeastern Tibet |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| WOS记录号 | WOS:001192973700001 |
| 来源期刊 | MINERALS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/287803 |
| 作者单位 | Kunming University of Science & Technology |
| 推荐引用方式 GB/T 7714 | . Petrogenesis and Tectonic Implications of the Oligocene Dalongtan Shoshonitic Syenite Porphyry in Central Yunnan, Southeastern Tibetan Plateau: Constraints from Geochronology, Geochemistry and Sr-Nd-Hf Isotopes[J],2024,14(3). |
| APA | (2024).Petrogenesis and Tectonic Implications of the Oligocene Dalongtan Shoshonitic Syenite Porphyry in Central Yunnan, Southeastern Tibetan Plateau: Constraints from Geochronology, Geochemistry and Sr-Nd-Hf Isotopes.MINERALS,14(3). |
| MLA | "Petrogenesis and Tectonic Implications of the Oligocene Dalongtan Shoshonitic Syenite Porphyry in Central Yunnan, Southeastern Tibetan Plateau: Constraints from Geochronology, Geochemistry and Sr-Nd-Hf Isotopes".MINERALS 14.3(2024). |
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