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Título:
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Deposition of highly crystalline graphite from moderate-temperature fluids
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Autores:
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Luque del Villar, Francisco Javier ;
Ortega Menor, Lorena ;
Barrenechea, José F. ;
Millward, David ;
Beyssac, Olivier ;
Huizenga, Jan-Marten
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Tipo de documento:
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texto impreso
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Editorial:
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Geological Society of America, 2009
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Geología
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Tipo = Artículo
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Resumen:
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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.
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En línea:
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https://eprints.ucm.es/44869/1/12%202009-Luque%20et%20al.%20Geology%20-%20Grafito%20baja%20T1.pdf
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