Deposition of highly crystalline graphite from moderate-temperature fluids



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Luque del Villar, Francisco Javier and Ortega Menor, Lorena and Barrenechea, José F. and Millward, David and Beyssac, Olivier and Huizenga, Jan-Marten (2009) Deposition of highly crystalline graphite from moderate-temperature fluids. Geology (Boulder Colo.), 37 (3). pp. 257-278. ISSN 0091-7613

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Recognized large occurrences of fl uid-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 XCO2/(XCO2 + XCH4) ratio of 0.69, thus indicating temperatures of ~500 °C at the fayalite-magnetite-quartz buffered conditions. Therefore, this is the fi rst reported evidence indicating that huge concentrations of highly crystalline graphite can precipitate from moderate-temperature fluids.

Item Type:Article
Uncontrolled Keywords:Graphite deposition
Subjects:Sciences > Geology
ID Code:44869
Deposited On:28 Sep 2017 11:58
Last Modified:11 Dec 2018 08:46

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