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How metalliferous brines line Mexican epithermal veins with silver

Citation

Wilkinson, JJ and Simmons, SF and Stoffell, B, How metalliferous brines line Mexican epithermal veins with silver, Scientific Reports, 3 Article 2057. ISSN 2045-2322 (2013) [Refereed Article]


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Licensed under Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0) http://creativecommons.org/licenses/by-nc-nd/3.0/

DOI: doi:10.1038/srep02057

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:GEOCHEMISTRY GEOLOGY MINERALOGY PETROLOGY
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration Geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Wilkinson, JJ (Professor Jamie Wilkinson)
ID Code:88295
Year Published:2013
Web of Science® Times Cited:4
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2014-01-24
Last Modified:2017-11-06
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