Deposition of highly crystalline graphite from moderate-temperature fluids

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Publication:
Deposition of highly crystalline graphite from moderate-temperature fluids

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12 2009-Luque et al. Geology - Grafito baja T1.pdf (162.3 KB)

Official URL

http://geology.geoscienceworld.org/archive/

Publication Date

2009

Authors

Luque del Villar, Francisco Javier

Ortega Menor, Lorena

Scopus Author ID

Web of Science ResearcherID

Google Scholar ID

Barrenechea, José F.

Millward, David

Beyssac, Olivier

Huizenga, Jan-Marten

Publisher

Geological Society of America

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Abstract

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.

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Unesco subjects

URI

https://hdl.handle.net/20.500.14352/52119

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