How metalliferous brines line Mexican epithermal veins with silver
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How metalliferous brines line ...
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Issue date
2013-06-24Submitted date
2020-04-07Subject Terms
GeochemistryGeology
Mineralogy
Petrology
Mexico
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We determined the composition of ~30-m.y.-old solutions extracted from fluid inclusions in one of the world's largest and richest silver ore deposits at Fresnillo, Mexico. Silver concentrations average 14 ppm and have a maximum of 27 ppm. The highest silver, lead and zinc concentrations correlate with salinity, consistent with transport by chloro-complexes and confirming the importance of brines in ore formation. The temporal distribution of these fluids within the veins suggests mineralization occurred episodically when they were injected into a fracture system dominated by low salinity, metal-poor fluids. Mass balance shows that a modest volume of brine, most likely of magmatic origin, is sufficient to supply the metal found in large Mexican silver deposits. The results suggest that ancient epithermal ore-forming events may involve fluid packets not captured in modern geothermal sampling and that giant ore deposits can form rapidly from small volumes of metal-rich fluid.Citation
Wilkinson, J., Simmons, S. & Stoffell, B. How metalliferous brines line Mexican epithermal veins with silver. Sci Rep 3, 2057 (2013). https://doi.org/10.1038/srep02057Publisher
Springer Science and Business Media LLCJournal
Scientific ReportsType
Journal ArticleItem Description
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/. The attached file is the published pdf.EISSN
2045-2322ae974a485f413a2113503eed53cd6c53
10.1038/srep02057
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