RT Journal Article
T1 Deposition of highly crystalline graphite from moderate-temperature fluids
A1 Luque Del Villar, Francisco Javier
A1 Ortega Menor, Lorena
A1 Barrenechea, José F.
A1 Millward, David
A1 Beyssac, Olivier
A1 Huizenga, Jan-Marten
AB 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.
PB Geological Society of America
SN 0091-7613
YR 2009
FD 2009
LK https://hdl.handle.net/20.500.14352/52119
UL https://hdl.handle.net/20.500.14352/52119
LA eng
NO Ministerio de Educación y Ciencia (MEC)
DS Docta Complutense
RD 21 abr 2025