Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)

[EN] 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.`

Bibliographic Details

Main Authors:	Fernandez-Turiel, J. L., Saavedra Alonso, Julio, Vaquer Navarro, Ramón, Durán Barrachina, M. E., Querol, Xavier
Format:	artículo biblioteca
Language:	English
Published:	CSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA) 1991
Subjects:	Alterations, Iberian Massif, Tin, Granite, Granito, Estaño, Macizo Ibérico, Alteración,
Online Access:	http://hdl.handle.net/10261/6819
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