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 pla...

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Authors: Fernandez-Turiel, J. L., Saavedra Alonso, Julio, Vaquer Navarro, Ramón, Durán Barrachina, M. E., Querol, Xavier
Format: article
Publication Date:1991
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/6819
Online Access:http://hdl.handle.net/10261/6819
Access Level:Open access
Keyword:Alterations
Iberian Massif
Tin
Granite
Granito
Estaño
Macizo Ibérico
Alteración
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oai_identifier_str oai:digital.csic.es:10261/6819
network_acronym_str ES
network_name_str España
repository_id_str
spelling Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)Fernandez-Turiel, J. L.Saavedra Alonso, JulioVaquer Navarro, RamónDurán Barrachina, M. E.Querol, XavierAlterationsIberian MassifTinGraniteGranitoEstañoMacizo IbéricoAlteración[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.`[ES] En el Batolito de Ricobayo (Zamora, noroeste de Espana) se ha podido distinguir la siguiente secuencia de procesos de alteración: microclinización, cloritización, albitización, moscovitizaciÓn, turmalinización y granatización. Estos procesos se han producido como consecuencia de la interacción entre fluidos y roca en las etapas tardi- y post-magmáticas del mencionado batolito. Las condiciones físico-químicas deducidas para estos fluidos son: temperatura inferior a 600 OC, presión entre 1.5 y 1 Kb, fugacidad de oxigeno entre 10-25a nd 10-35b ars, fugacidad de azufre inferior a 10-'s bars, la composición se mantuvo esencialmente estable y su log (a(K+)/a(Ht)) y log (a(Na+)/a(H+)) variaron entre 3.8 y 3.2 y entre 3.5 y 4.6, respectivamente, mientras que el pH de 10s fluidos fue superior a 5 durante la microclinización, moscovitización y turmalinización, e inferior durante la cloritización y la albitización. En 10s estadios con pH superior a 5 tuvo lugar la precipitación de casiterita.Peer reviewedCSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)200820081991info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501513337 bytesapplication/pdfhttp://hdl.handle.net/10261/6819reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/68192026-05-22T06:33:51Z
dc.title.none.fl_str_mv Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
title Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
spellingShingle Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
Fernandez-Turiel, J. L.
Alterations
Iberian Massif
Tin
Granite
Granito
Estaño
Macizo Ibérico
Alteración
title_short Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
title_full Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
title_fullStr Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
title_full_unstemmed Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
title_sort Late postmagmatic alterations in the tin-bearing batholith of Ricobayo (Iberian Massif, NW Spain)
dc.creator.none.fl_str_mv Fernandez-Turiel, J. L.
Saavedra Alonso, Julio
Vaquer Navarro, Ramón
Durán Barrachina, M. E.
Querol, Xavier
author Fernandez-Turiel, J. L.
author_facet Fernandez-Turiel, J. L.
Saavedra Alonso, Julio
Vaquer Navarro, Ramón
Durán Barrachina, M. E.
Querol, Xavier
author_role author
author2 Saavedra Alonso, Julio
Vaquer Navarro, Ramón
Durán Barrachina, M. E.
Querol, Xavier
author2_role author
author
author
author
dc.subject.none.fl_str_mv Alterations
Iberian Massif
Tin
Granite
Granito
Estaño
Macizo Ibérico
Alteración
topic Alterations
Iberian Massif
Tin
Granite
Granito
Estaño
Macizo Ibérico
Alteración
description [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.`
publishDate 1991
dc.date.none.fl_str_mv 1991
2008
2008
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/6819
url http://hdl.handle.net/10261/6819
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 513337 bytes
application/pdf
dc.publisher.none.fl_str_mv CSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)
publisher.none.fl_str_mv CSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869420421255790592
score 15,812429

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