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The role of disseminated calcite in the chemical weathering of granitoid rocks

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The role of disseminated calcite in the chemical weathering of granitoid rocks; 1999; Article; Journal; Geochimica et Cosmochimica Acta; White, A. F.; Bullen, T. D.; Vivit, D. V.; Schulz, M. S.; Clow, D. W.

Summary

Accessory calcite, present at concentrations between 300 and 3000 mg kg-1, occurs in fresh granitoid rocks sampled from the Merced watershed in Yosemite National Park, CA, USA; Loch Vale in Rocky Mountain National Park CO USA; the Panola watershed, GA USA; and the Rio Icacos, Puerto Rico. Calcite occurs as fillings in microfractures, as disseminated grains within the silicate matrix, and as replacement of calcic cores in plagioclase. Flow-through column experiments, using de-ionized water saturated with 0.05 atm. CO2, produced effluents from the fresh granitoid rocks that were dominated by Ca and bicarbonate and thermodynamically saturated with calcite. During reactions up to 1.7 yr, calcite dissolution progressively decreased and [...]

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Type Scheme Key
local-index unknown 70021504
local-pk unknown 70021504
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.1016/S0016-7037(99)00082-4
series unknown Geochimica et Cosmochimica Acta

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journalGeochimica et Cosmochimica Acta
parts
typevolume
value63
typeissue
value13-14
languageEnglish
citationTypeArticle

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