Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits

Autores
Japas, Maria Silvia; Rubinstein, Nora Alicia; Gómez, Anabel
Año de publicación
2022
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Mid Permian San Pedro porphyry deposit in the San Rafael Massif (central-western Argentina) offers a valuable opportunity to contribute in the understanding of ore concentration mechanisms operating during the phyllic alteration stage. In this deposit, two generations of low-temperature D-veins (D1 and D2) formed during the phyllic alteration stage. The D2-type veins show an atypical Cu-Ag sulfide paragenesis consisting mainly of galena, chalcocite, native silver, chalcopyrite and bornite, which can not be explained using the traditional cooling model. Based on previous research and own data, we test Reverse Osmosis as a possible mechanism contributing to D2-vein ore deposition. Reverse Osmosis is a pressure-driven retention-selective membrane filtration process resulting in solute/ion retention on the high-pressure side of the membrane. D2-veins from San Pedro porphyry formed at 211°–176 °C during transient fluid overpressures produced by the hydrothermal sealing that followed the earlier D1-vein formation. Besides the temperature range and the declining orogeny, physico-chemical conditions were optimal for Reverse Osmosis to activate because the presence of a semi-permeable phyllic membrane and a transmembrane pressure gradient with hydrothermal fluid pressure exceeding the relatively low stress normal to the fracture walls (σn). This particular condition activated Reverse Osmosis, allowing to get similar membrane rejection values for Cu and Ag chloride complexes at lower fluid temperatures, causing the decrease of the osmotic differentiation performance, and the consequent coeval precipitation of Cu and Ag sulfide minerals.
Fil: Japas, Maria Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Rubinstein, Nora Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Gómez, Anabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Materia
ATYPICAL CU-AG ORE PARAGENESIS
HYDROTHERMAL FLUID PRESSURE AND STRESS CONDITIONS
OSMOTIC DIFFERENTIATION
PERMIAN SAN PEDRO PORPHYRY DEPOSIT
PHYLLIC ALTERATION
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/203609
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/203609
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper depositsJapas, Maria SilviaRubinstein, Nora AliciaGómez, AnabelATYPICAL CU-AG ORE PARAGENESISHYDROTHERMAL FLUID PRESSURE AND STRESS CONDITIONSOSMOTIC DIFFERENTIATIONPERMIAN SAN PEDRO PORPHYRY DEPOSITPHYLLIC ALTERATIONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Mid Permian San Pedro porphyry deposit in the San Rafael Massif (central-western Argentina) offers a valuable opportunity to contribute in the understanding of ore concentration mechanisms operating during the phyllic alteration stage. In this deposit, two generations of low-temperature D-veins (D1 and D2) formed during the phyllic alteration stage. The D2-type veins show an atypical Cu-Ag sulfide paragenesis consisting mainly of galena, chalcocite, native silver, chalcopyrite and bornite, which can not be explained using the traditional cooling model. Based on previous research and own data, we test Reverse Osmosis as a possible mechanism contributing to D2-vein ore deposition. Reverse Osmosis is a pressure-driven retention-selective membrane filtration process resulting in solute/ion retention on the high-pressure side of the membrane. D2-veins from San Pedro porphyry formed at 211°–176 °C during transient fluid overpressures produced by the hydrothermal sealing that followed the earlier D1-vein formation. Besides the temperature range and the declining orogeny, physico-chemical conditions were optimal for Reverse Osmosis to activate because the presence of a semi-permeable phyllic membrane and a transmembrane pressure gradient with hydrothermal fluid pressure exceeding the relatively low stress normal to the fracture walls (σn). This particular condition activated Reverse Osmosis, allowing to get similar membrane rejection values for Cu and Ag chloride complexes at lower fluid temperatures, causing the decrease of the osmotic differentiation performance, and the consequent coeval precipitation of Cu and Ag sulfide minerals.Fil: Japas, Maria Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Rubinstein, Nora Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Gómez, Anabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaElsevier2022-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/203609Japas, Maria Silvia; Rubinstein, Nora Alicia; Gómez, Anabel; Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits; Elsevier; Ore Geology Reviews; 143; 4-2022; 1-170169-1368CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0169136822000543info:eu-repo/semantics/altIdentifier/doi/10.1016/j.oregeorev.2022.104746info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:57:39Zoai:ri.conicet.gov.ar:11336/203609instacron: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:34982025-09-29 09:57:39.343CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
title Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
spellingShingle Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
Japas, Maria Silvia
ATYPICAL CU-AG ORE PARAGENESIS
HYDROTHERMAL FLUID PRESSURE AND STRESS CONDITIONS
OSMOTIC DIFFERENTIATION
PERMIAN SAN PEDRO PORPHYRY DEPOSIT
PHYLLIC ALTERATION
title_short Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
title_full Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
title_fullStr Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
title_full_unstemmed Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
title_sort Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits
dc.creator.none.fl_str_mv Japas, Maria Silvia
Rubinstein, Nora Alicia
Gómez, Anabel
author Japas, Maria Silvia
author_facet Japas, Maria Silvia
Rubinstein, Nora Alicia
Gómez, Anabel
author_role author
author2 Rubinstein, Nora Alicia
Gómez, Anabel
author2_role author
author
dc.subject.none.fl_str_mv ATYPICAL CU-AG ORE PARAGENESIS
HYDROTHERMAL FLUID PRESSURE AND STRESS CONDITIONS
OSMOTIC DIFFERENTIATION
PERMIAN SAN PEDRO PORPHYRY DEPOSIT
PHYLLIC ALTERATION
topic ATYPICAL CU-AG ORE PARAGENESIS
HYDROTHERMAL FLUID PRESSURE AND STRESS CONDITIONS
OSMOTIC DIFFERENTIATION
PERMIAN SAN PEDRO PORPHYRY DEPOSIT
PHYLLIC ALTERATION
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 Mid Permian San Pedro porphyry deposit in the San Rafael Massif (central-western Argentina) offers a valuable opportunity to contribute in the understanding of ore concentration mechanisms operating during the phyllic alteration stage. In this deposit, two generations of low-temperature D-veins (D1 and D2) formed during the phyllic alteration stage. The D2-type veins show an atypical Cu-Ag sulfide paragenesis consisting mainly of galena, chalcocite, native silver, chalcopyrite and bornite, which can not be explained using the traditional cooling model. Based on previous research and own data, we test Reverse Osmosis as a possible mechanism contributing to D2-vein ore deposition. Reverse Osmosis is a pressure-driven retention-selective membrane filtration process resulting in solute/ion retention on the high-pressure side of the membrane. D2-veins from San Pedro porphyry formed at 211°–176 °C during transient fluid overpressures produced by the hydrothermal sealing that followed the earlier D1-vein formation. Besides the temperature range and the declining orogeny, physico-chemical conditions were optimal for Reverse Osmosis to activate because the presence of a semi-permeable phyllic membrane and a transmembrane pressure gradient with hydrothermal fluid pressure exceeding the relatively low stress normal to the fracture walls (σn). This particular condition activated Reverse Osmosis, allowing to get similar membrane rejection values for Cu and Ag chloride complexes at lower fluid temperatures, causing the decrease of the osmotic differentiation performance, and the consequent coeval precipitation of Cu and Ag sulfide minerals.
Fil: Japas, Maria Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Rubinstein, Nora Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Gómez, Anabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
description The Mid Permian San Pedro porphyry deposit in the San Rafael Massif (central-western Argentina) offers a valuable opportunity to contribute in the understanding of ore concentration mechanisms operating during the phyllic alteration stage. In this deposit, two generations of low-temperature D-veins (D1 and D2) formed during the phyllic alteration stage. The D2-type veins show an atypical Cu-Ag sulfide paragenesis consisting mainly of galena, chalcocite, native silver, chalcopyrite and bornite, which can not be explained using the traditional cooling model. Based on previous research and own data, we test Reverse Osmosis as a possible mechanism contributing to D2-vein ore deposition. Reverse Osmosis is a pressure-driven retention-selective membrane filtration process resulting in solute/ion retention on the high-pressure side of the membrane. D2-veins from San Pedro porphyry formed at 211°–176 °C during transient fluid overpressures produced by the hydrothermal sealing that followed the earlier D1-vein formation. Besides the temperature range and the declining orogeny, physico-chemical conditions were optimal for Reverse Osmosis to activate because the presence of a semi-permeable phyllic membrane and a transmembrane pressure gradient with hydrothermal fluid pressure exceeding the relatively low stress normal to the fracture walls (σn). This particular condition activated Reverse Osmosis, allowing to get similar membrane rejection values for Cu and Ag chloride complexes at lower fluid temperatures, causing the decrease of the osmotic differentiation performance, and the consequent coeval precipitation of Cu and Ag sulfide minerals.
publishDate 2022
dc.date.none.fl_str_mv 2022-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/203609
Japas, Maria Silvia; Rubinstein, Nora Alicia; Gómez, Anabel; Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits; Elsevier; Ore Geology Reviews; 143; 4-2022; 1-17
0169-1368
CONICET Digital
CONICET
url http://hdl.handle.net/11336/203609
identifier_str_mv Japas, Maria Silvia; Rubinstein, Nora Alicia; Gómez, Anabel; Revisiting reverse osmosis as a mechanism contributing to metal zoning in porphyry copper deposits; Elsevier; Ore Geology Reviews; 143; 4-2022; 1-17
0169-1368
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0169136822000543
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.oregeorev.2022.104746
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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