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Late and postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
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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.
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FERNÁNDEZ TURIEL, José luis, SAAVEDRA ALONSO, Julio, VAQUER NAVARRO, Ramón, QUEROL CARCELLER, Xavier. Late and postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain). _Acta Geologica Hispanica_. 1991. Vol. 26, núm. 1, pàgs. 17-22. [consulta: 20 de gener de 2026]. ISSN: 0567-7505. [Disponible a: https://hdl.handle.net/2445/32992]