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Deposition of highly crystalline graphite from moderate-temperature fluids

Luque, F.J.; Ortega, Lorena; Barrenechea, Jose Fernandez; Millward, David; Beyssac, Olivier; Huizenga, Jan Marten. 2009 Deposition of highly crystalline graphite from moderate-temperature fluids. Geology, 37 (3). 275-278. 10.1130/G25284A.1

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Abstract/Summary

Recognized large occurrences of fluid-deposited graphite displaying high crystallinity were previously restricted to high-temperature environments (mainly granulite facies terranes). However, in the extensively mined Borrowdale deposit (UK), the mineralogical assemblage, notably the graphite-epidote intergrowths, shows that fully ordered graphite precipitated during the propylitic hydrothermal alteration of the volcanic host rocks. Fluids responsible for graphite deposition had an average X CO2/(XCO2 + X CH4) ratio of 0.69, thus indicating temperatures of ~500 °C at the fayalite-magnetite-quartz buffered conditions. Therefore, this is the first reported evidence indicating that huge concentrations of highly crystalline graphite can precipitate from moderate-temperature fluids.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1130/G25284A.1
Programmes: BGS Programmes 2008 > Geology and Landscape England
ISSN: 0091-7613
Additional Keywords: Graphite deposits
NORA Subject Terms: Earth Sciences
Date made live: 12 Mar 2009 11:49
URI: http://nora.nerc.ac.uk/id/eprint/6191

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