Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/16888
Title: Role of fluid mixing in deep dissolution of carbonates
Author: Corbella i Cordomí, Mercè
Ayora, Carles
Keywords: Roques carbonatades
Dipòsits minerals
Geoquímica
Carbonate rocks
Mineral deposits
Geochemistry
Issue Date: 2003
Publisher: Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)
Abstract: The presence of cavities filled with new minerals in carbonate rocks is a common feature in oil reservoirs and lead-zinc deposits. Since groundwater equilibrates rapidly with carbonates, the presence of dissolution cavities in deep carbonate host rocks is a paradox. Two alternative geochemical processes have been proposed to dissolve carbonates at depth: hydrogen sulfide oxidation to sulfuric acid, and metal sulfide precipitation. With the aid of geochemical modeling we show that mixing two warm solutions saturated with carbonate results in a new solution that dissolves limestone. Variations in the proportion of the end-member fluids can also form a supersaturated mixture and fill the cavity with a new generation of carbonate. Mixing is in general more effective in dissolving carbonates than the aforementioned processes. Moreover, mixing is consistent with the wide set of textures and mineral proportions observed in cavity infillings.
Note: Reproducció del document publicat a http://www.geologica-acta.com/pdf/vol0104a01.pdf
It is part of: Geologica Acta, 2003, vol. 1, núm. 4, p. 305-313
URI: http://hdl.handle.net/2445/16888
ISSN: 1695-6133
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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