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| DOI | 10.1016/j.epsl.2021.116889 |
| Fluid mixing as primary trigger for cassiterite deposition: Evidence from in situ δ18O-δ11B analysis of tourmaline from the world-class San Rafael tin (-copper) deposit, Peru | |
| Harlaux M.; Kouzmanov K.; Gialli S.; Marger K.; Bouvier A.-S.; Baumgartner L.P.; Rielli A.; Dini A.; Chauvet A.; Kalinaj M.; Fontboté L. | |
| 发表日期 | 2021 |
| ISSN | 0012821X |
| 卷号 | 563 |
| 英文摘要 | We present a high-resolution in situ study of oxygen and boron isotopes measured in tourmaline from the world-class San Rafael Sn (–Cu) deposit (Central Andean tin belt, Peru) aiming to trace major fluid processes at the magmatic-hydrothermal transition leading to the precipitation of cassiterite. Our results show that late-magmatic and pre-ore hydrothermal tourmaline has similar values of δ18O (from 10.6‰ to 14.1‰) and δ11B (from −11.5‰ to −6.9‰). The observed δ18O and δ11B variations are dominantly driven by Rayleigh fractionation, reflecting tourmaline crystallization in a continuously evolving magmatic-hydrothermal system. In contrast, syn-ore hydrothermal tourmaline intergrown with cassiterite has lower δ18O values (from 4.9‰ to 10.2‰) and in part higher δ11B values (from −9.9‰ to −5.4‰) than late-magmatic and pre-ore hydrothermal tourmaline, indicating important contribution of meteoric groundwater to the hydrothermal system during ore deposition. Quantitative geochemical modeling demonstrates that the δ18O-δ11B composition of syn-ore tourmaline records variable degrees of mixing of a hot Sn-rich magmatic brine with meteoric waters that partially exchanged with the host rocks. These results provide thus direct in situ isotopic evidence of fluid mixing as a major mechanism triggering cassiterite deposition. Further, this work shows that combined in situ δ18O and δ11B analyses of tourmaline is a powerful approach for understanding fluid processes in dynamic magmatic-hydrothermal environments. © 2021 The Author(s) |
| 关键词 | boron isotopesfluid mixinghydrothermal fluidsoxygen isotopestin deposittourmaline |
| 英文关键词 | Copper deposits; Deposits; Groundwater; Isotopes; Ores; Silicate minerals; Boron isotopes; Fluid mixing; High resolution; Hydrothermal fluids; In-Situ Study; Magmatic-hydrothermal systems; Oxygen isotopes; Rayleigh fractionation; Tin-copper; World class; Mixing; boron isotope; cassiterite; deposition; hydrothermal fluid; mixing; oxygen isotope; precipitation (chemistry); tin; tourmaline; trigger mechanism; Andes; Cordillera Central [Andes]; Peru |
| 语种 | 英语 |
| 来源期刊 | Earth and Planetary Science Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/203120 |
| 作者单位 | Department of Earth Sciences, University of Geneva, Geneva, 1205, Switzerland; Nevada Bureau of Mines and Geology, University of Nevada, Reno, NV 89557, United States; Institute of Earth Sciences, University of Lausanne, Lausanne, 1015, Switzerland; Istituto di Geoscienze e Georisorse, CNR, Pisa, 56124, Italy; Géosciences Montpellier, UMR 5243, CNRS, Montpellier, 34095, France; Minsur S.A., Jr. Lorenzo Bernini 149, San Borja, Lima, 27, Peru |
| 推荐引用方式 GB/T 7714 | Harlaux M.,Kouzmanov K.,Gialli S.,et al. Fluid mixing as primary trigger for cassiterite deposition: Evidence from in situ δ18O-δ11B analysis of tourmaline from the world-class San Rafael tin (-copper) deposit, Peru[J],2021,563. |
| APA | Harlaux M..,Kouzmanov K..,Gialli S..,Marger K..,Bouvier A.-S..,...&Fontboté L..(2021).Fluid mixing as primary trigger for cassiterite deposition: Evidence from in situ δ18O-δ11B analysis of tourmaline from the world-class San Rafael tin (-copper) deposit, Peru.Earth and Planetary Science Letters,563. |
| MLA | Harlaux M.,et al."Fluid mixing as primary trigger for cassiterite deposition: Evidence from in situ δ18O-δ11B analysis of tourmaline from the world-class San Rafael tin (-copper) deposit, Peru".Earth and Planetary Science Letters 563(2021). |
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