globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116889
论文题名:
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
作者: Harlaux M.; Kouzmanov K.; Gialli S.; Marger K.; Bouvier A.-S.; Baumgartner L.P.; Rielli A.; Dini A.; Chauvet A.; Kalinaj M.; Fontboté L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563
语种: 英语
中文关键词: boron isotopes ; fluid mixing ; hydrothermal fluids ; oxygen isotopes ; tin deposit ; tourmaline
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
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)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165498
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2021-01-01,563
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