The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences

Autores
Paez, Gerardo Nestor; Ruiz, Remigio; Guido, Diego Martin; Jovic, Sebastian Miguel; Schalamuk, Bernardo Isidoro
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Deseado Massif is a 60000km2 geological region located in southern Argentinean Patagonia. The most important geological feature of this area is an extensive plateau characterized by complex and long-lived Middle to Upper Jurassic volcanism, composed of intermediate to acid volcanic rocks of the Bahía Laura Volcanic Complex. This voluminous volcanism originated in a widespread extensional environment that affected all of Patagonia, related to the opening of the Atlantic Ocean. The volcanic rocks are genetically related to Jurassic epithermal deposits. Consequently the region is an important gold and silver producer with four operational mines (Cerro Vanguardia, Mina Martha, Manantial Espejo and San José) and more than 50 epithermal occurrences undergoing different levels of exploration. Potassic metasomatism identified in the Bahía Laura Volcanic Complex is difficult to recognize in hand specimen, but is characterized by K2O/Na2O ratios higher than 2.5 and L.O.I. values lower than 3wt.%, and affects only rocks with silica contents over 68wt.%. The metasomatism produced an intense geochemical change in the affected rocks, with significant additions of K2O, Rb, Au, Sb, W and a minor enrichment in Cs, Cu, As, and probably Ag and Hg. Strongly depleted elements are MgO, CaO, Na2O, P2O5, MnO, Sr and U, whereas FeOt, TiO2, L.O.I., Pb and Zn are moderately depleted. Finally, SiO2, Al2O3, Mo and most trace elements and REE remained almost invariant during increasing metasomatism. Strong similarities in lithologies and geochemical signatures observed in K-metasomatized areas around the world, regardless of their geological settings and fluid origins, suggest that volcanic glass probably played an important role as an ion exchanger during alteration. Due to the high mobility of elements that occurs during K-metasomatism, no classification or discrimination diagram based on major elements, TiO2 or Rb are considered to be valid for the chemical characterization of volcanic rocks based on metasomatized samples. The precious and base metals enrichment/depletion pattern of K-metasomatized rocks is identical to the geochemical signature observed in the upper parts of low sulfidation environments from the Deseado Massif. This geochemical signature, along with spatial relations observed between K-metasomatized rocks and epithermal manifestations, implies that hydrothermal fluids were responsible for the metasomatism observed in the Bahia Laura Volcanic Complex.
Fil: Paez, Gerardo Nestor. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Ruiz, Remigio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Guido, Diego Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Jovic, Sebastian Miguel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Schalamuk, Bernardo Isidoro. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Materia
ALTERATION
DESEADO MASSIF
EPITHERMAL
METASOMATISM
VOLCANIC GLASS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/193144
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequencesPaez, Gerardo NestorRuiz, RemigioGuido, Diego MartinJovic, Sebastian MiguelSchalamuk, Bernardo IsidoroALTERATIONDESEADO MASSIFEPITHERMALMETASOMATISMVOLCANIC GLASShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Deseado Massif is a 60000km2 geological region located in southern Argentinean Patagonia. The most important geological feature of this area is an extensive plateau characterized by complex and long-lived Middle to Upper Jurassic volcanism, composed of intermediate to acid volcanic rocks of the Bahía Laura Volcanic Complex. This voluminous volcanism originated in a widespread extensional environment that affected all of Patagonia, related to the opening of the Atlantic Ocean. The volcanic rocks are genetically related to Jurassic epithermal deposits. Consequently the region is an important gold and silver producer with four operational mines (Cerro Vanguardia, Mina Martha, Manantial Espejo and San José) and more than 50 epithermal occurrences undergoing different levels of exploration. Potassic metasomatism identified in the Bahía Laura Volcanic Complex is difficult to recognize in hand specimen, but is characterized by K2O/Na2O ratios higher than 2.5 and L.O.I. values lower than 3wt.%, and affects only rocks with silica contents over 68wt.%. The metasomatism produced an intense geochemical change in the affected rocks, with significant additions of K2O, Rb, Au, Sb, W and a minor enrichment in Cs, Cu, As, and probably Ag and Hg. Strongly depleted elements are MgO, CaO, Na2O, P2O5, MnO, Sr and U, whereas FeOt, TiO2, L.O.I., Pb and Zn are moderately depleted. Finally, SiO2, Al2O3, Mo and most trace elements and REE remained almost invariant during increasing metasomatism. Strong similarities in lithologies and geochemical signatures observed in K-metasomatized areas around the world, regardless of their geological settings and fluid origins, suggest that volcanic glass probably played an important role as an ion exchanger during alteration. Due to the high mobility of elements that occurs during K-metasomatism, no classification or discrimination diagram based on major elements, TiO2 or Rb are considered to be valid for the chemical characterization of volcanic rocks based on metasomatized samples. The precious and base metals enrichment/depletion pattern of K-metasomatized rocks is identical to the geochemical signature observed in the upper parts of low sulfidation environments from the Deseado Massif. This geochemical signature, along with spatial relations observed between K-metasomatized rocks and epithermal manifestations, implies that hydrothermal fluids were responsible for the metasomatism observed in the Bahia Laura Volcanic Complex.Fil: Paez, Gerardo Nestor. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; ArgentinaFil: Ruiz, Remigio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; ArgentinaFil: Guido, Diego Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; ArgentinaFil: Jovic, Sebastian Miguel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Schalamuk, Bernardo Isidoro. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaElsevier Science2010-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/193144Paez, Gerardo Nestor; Ruiz, Remigio; Guido, Diego Martin; Jovic, Sebastian Miguel; Schalamuk, Bernardo Isidoro; The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences; Elsevier Science; Chemical Geology; 273; 3-4; 2-2010; 300-3130009-2541CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0009254110000975info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2010.03.007info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:21:43Zoai:ri.conicet.gov.ar:11336/193144instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:21:43.691CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
title The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
spellingShingle The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
Paez, Gerardo Nestor
ALTERATION
DESEADO MASSIF
EPITHERMAL
METASOMATISM
VOLCANIC GLASS
title_short The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
title_full The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
title_fullStr The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
title_full_unstemmed The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
title_sort The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences
dc.creator.none.fl_str_mv Paez, Gerardo Nestor
Ruiz, Remigio
Guido, Diego Martin
Jovic, Sebastian Miguel
Schalamuk, Bernardo Isidoro
author Paez, Gerardo Nestor
author_facet Paez, Gerardo Nestor
Ruiz, Remigio
Guido, Diego Martin
Jovic, Sebastian Miguel
Schalamuk, Bernardo Isidoro
author_role author
author2 Ruiz, Remigio
Guido, Diego Martin
Jovic, Sebastian Miguel
Schalamuk, Bernardo Isidoro
author2_role author
author
author
author
dc.subject.none.fl_str_mv ALTERATION
DESEADO MASSIF
EPITHERMAL
METASOMATISM
VOLCANIC GLASS
topic ALTERATION
DESEADO MASSIF
EPITHERMAL
METASOMATISM
VOLCANIC GLASS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Deseado Massif is a 60000km2 geological region located in southern Argentinean Patagonia. The most important geological feature of this area is an extensive plateau characterized by complex and long-lived Middle to Upper Jurassic volcanism, composed of intermediate to acid volcanic rocks of the Bahía Laura Volcanic Complex. This voluminous volcanism originated in a widespread extensional environment that affected all of Patagonia, related to the opening of the Atlantic Ocean. The volcanic rocks are genetically related to Jurassic epithermal deposits. Consequently the region is an important gold and silver producer with four operational mines (Cerro Vanguardia, Mina Martha, Manantial Espejo and San José) and more than 50 epithermal occurrences undergoing different levels of exploration. Potassic metasomatism identified in the Bahía Laura Volcanic Complex is difficult to recognize in hand specimen, but is characterized by K2O/Na2O ratios higher than 2.5 and L.O.I. values lower than 3wt.%, and affects only rocks with silica contents over 68wt.%. The metasomatism produced an intense geochemical change in the affected rocks, with significant additions of K2O, Rb, Au, Sb, W and a minor enrichment in Cs, Cu, As, and probably Ag and Hg. Strongly depleted elements are MgO, CaO, Na2O, P2O5, MnO, Sr and U, whereas FeOt, TiO2, L.O.I., Pb and Zn are moderately depleted. Finally, SiO2, Al2O3, Mo and most trace elements and REE remained almost invariant during increasing metasomatism. Strong similarities in lithologies and geochemical signatures observed in K-metasomatized areas around the world, regardless of their geological settings and fluid origins, suggest that volcanic glass probably played an important role as an ion exchanger during alteration. Due to the high mobility of elements that occurs during K-metasomatism, no classification or discrimination diagram based on major elements, TiO2 or Rb are considered to be valid for the chemical characterization of volcanic rocks based on metasomatized samples. The precious and base metals enrichment/depletion pattern of K-metasomatized rocks is identical to the geochemical signature observed in the upper parts of low sulfidation environments from the Deseado Massif. This geochemical signature, along with spatial relations observed between K-metasomatized rocks and epithermal manifestations, implies that hydrothermal fluids were responsible for the metasomatism observed in the Bahia Laura Volcanic Complex.
Fil: Paez, Gerardo Nestor. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Ruiz, Remigio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Guido, Diego Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Jovic, Sebastian Miguel. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Schalamuk, Bernardo Isidoro. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
description The Deseado Massif is a 60000km2 geological region located in southern Argentinean Patagonia. The most important geological feature of this area is an extensive plateau characterized by complex and long-lived Middle to Upper Jurassic volcanism, composed of intermediate to acid volcanic rocks of the Bahía Laura Volcanic Complex. This voluminous volcanism originated in a widespread extensional environment that affected all of Patagonia, related to the opening of the Atlantic Ocean. The volcanic rocks are genetically related to Jurassic epithermal deposits. Consequently the region is an important gold and silver producer with four operational mines (Cerro Vanguardia, Mina Martha, Manantial Espejo and San José) and more than 50 epithermal occurrences undergoing different levels of exploration. Potassic metasomatism identified in the Bahía Laura Volcanic Complex is difficult to recognize in hand specimen, but is characterized by K2O/Na2O ratios higher than 2.5 and L.O.I. values lower than 3wt.%, and affects only rocks with silica contents over 68wt.%. The metasomatism produced an intense geochemical change in the affected rocks, with significant additions of K2O, Rb, Au, Sb, W and a minor enrichment in Cs, Cu, As, and probably Ag and Hg. Strongly depleted elements are MgO, CaO, Na2O, P2O5, MnO, Sr and U, whereas FeOt, TiO2, L.O.I., Pb and Zn are moderately depleted. Finally, SiO2, Al2O3, Mo and most trace elements and REE remained almost invariant during increasing metasomatism. Strong similarities in lithologies and geochemical signatures observed in K-metasomatized areas around the world, regardless of their geological settings and fluid origins, suggest that volcanic glass probably played an important role as an ion exchanger during alteration. Due to the high mobility of elements that occurs during K-metasomatism, no classification or discrimination diagram based on major elements, TiO2 or Rb are considered to be valid for the chemical characterization of volcanic rocks based on metasomatized samples. The precious and base metals enrichment/depletion pattern of K-metasomatized rocks is identical to the geochemical signature observed in the upper parts of low sulfidation environments from the Deseado Massif. This geochemical signature, along with spatial relations observed between K-metasomatized rocks and epithermal manifestations, implies that hydrothermal fluids were responsible for the metasomatism observed in the Bahia Laura Volcanic Complex.
publishDate 2010
dc.date.none.fl_str_mv 2010-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/193144
Paez, Gerardo Nestor; Ruiz, Remigio; Guido, Diego Martin; Jovic, Sebastian Miguel; Schalamuk, Bernardo Isidoro; The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences; Elsevier Science; Chemical Geology; 273; 3-4; 2-2010; 300-313
0009-2541
CONICET Digital
CONICET
url http://hdl.handle.net/11336/193144
identifier_str_mv Paez, Gerardo Nestor; Ruiz, Remigio; Guido, Diego Martin; Jovic, Sebastian Miguel; Schalamuk, Bernardo Isidoro; The effects of K-metasomatism in the Bahía Laura Volcanic Complex, Deseado Massif, Argentina: Petrologic and metallogenic consequences; Elsevier Science; Chemical Geology; 273; 3-4; 2-2010; 300-313
0009-2541
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2010.03.007
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv application/pdf
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dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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