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Title: Late and postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
Author: Fernández Turiel, José Luis
Saavedra Alonso, Julio
Vaquer Navarro, Ramón
Querol Carceller, Xavier
Keywords: Granit
Jaciments minerals
Meseta Nord (Península Ibèrica)
Mineral deposits
Meseta Nord (Iberian Peninsula)
Issue Date: 1991
Publisher: Universitat de Barcelona (UB). Institut de Cièncias de la Terra Jaume Almera (ICTJA)
Abstract: The deuteric alteration processes undergone by the granites of the Ricobayo Batholith were: microclinization, chloritization, albitization, muscovitization, tourmalinization and garnetization. These processes must be interpreted in a dynamic context so that the different reactions that take place are the consequence of a successive interaction between rock and fluids. The physicochemical conditions deduced from these fluids are: temperature lower than 600 OC, pressure between 1.5 and 1 Kb, fugacity of oxygen between 10-25 and 10-35 bars, fugacity of sulphur lower than 10-l5 bars, the composition was kept stable and their log (a(K+)/a(Ht)) and log (a(Na+)/a(H+)) varied between 3.8 and 3.2 and between 3.5 and 4.6, respectively, and the pH of the fluids was higher than 5 during the microclinization, muscovitization and tourmalinization, and lower during chloritization and albitization. The deposition of cassiterite occurs with pH episodes that exceed 5.
Note: Reproducció del document publicat a:
It is part of: Acta Geologica Hispanica, 1991, vol. 26, num. 1, p. 17-22
ISSN: 0567-7505
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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