Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geome...
- Autores
- Maydagán, Laura; Franchini, Marta Beatriz; Impiccini, Agnes; Lentz, David
- Año de publicación
- 2016
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Biotite, chlorite, muscovite, illite, and kaolinite from the Altar porphyry Cu-(Au) deposit of the Andean Main Cordillera of San Juan Province (Argentina) were constrained using X-ray diffraction, electron microprobe, and infrared spectroscopy analyses to map compositional variations. Magmatic and hydrothermal biotites from the andesite-dacite mineralized porphyries have higher XMg, K, and F contents and lower Fe/(Fe+Mg) ratios compared to the magmatic biotites from the andesite-dacite barren porphyries of the district Hydrothermal biotites from deep levels with potassic alteration and high Cu grades have the highest XMg ratios and high F contents. The similarity of the log fH2O/fHF, log fHF/fHCl, and log fH2O/fHCl fugacity ratios of biotites from Altar mineralized porphyries and from the neighbouring Los Pelambres porphyry copper deposit suggests that these parameters may be a function of the magmatic source. Chlorite crystals associated with Cu mineralization (0.2 to 1.2% Cu) show lower Fe andMn and higherMg contents than chlorite from shallow and distal zones. Potassic dioctahedral phyllosilicates are the most abundant phyllosilicates in the Altardeposit, occur in the phyllic and chloritic zones, and are superimposed on potassic alteration. In zones of high copper grades (N0.8% Cu), potassic dioctahedral phyllosilicates have total Al (apfu) between 2.4 and 2.8 andintermediate compositions between muscovite, phengitic muscovite, and illite, whereas those with higher and lower Al contents come from zones with lower Cu grades. Temperatures obtained from XMg-Ti equilibria in biotite (691?800 °C) and IVAl occupancy in chlorite (214? 340 °C), agreewith previous temperature estimates based on Ti in quartz and fluid inclusion microthermometry.Muscovite is stable at temperatures higher than ~300 °C, whereas phengitic muscovite indicates temperatures between 280 and 400 °C and higher K+/H+ conditions (less acidic environment) compared to muscovite. Illite represents a younger and cooler (220 to 310 °C) hydrothermal alteration event, and kaolinite in late veins halos reflects a decrease of the temperature (b200 °C) of late hydrothermal fluids. Our study demonstrates that variations in phyllosilicate composition have the potential to be used as vectors in ore exploration and to differentiate between barren and fertile intrusions. A detailed analysis of type and proportion of phyllosilicates, as well as the presence of ore minerals in fine fractions, should be undertaken to optimize metal recoveries during the upcoming benefaction of these ores.
Fil: Maydagán, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Franchini, Marta Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina
Fil: Impiccini, Agnes. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina
Fil: Lentz, David. University of New Brunswick; Canadá - Materia
-
PHYLLOSILICATES
CLAYS
ALTAR PORPHYRY
ARGENTINA - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/149905
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Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgyMaydagán, LauraFranchini, Marta BeatrizImpiccini, AgnesLentz, DavidPHYLLOSILICATESCLAYSALTAR PORPHYRYARGENTINAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Biotite, chlorite, muscovite, illite, and kaolinite from the Altar porphyry Cu-(Au) deposit of the Andean Main Cordillera of San Juan Province (Argentina) were constrained using X-ray diffraction, electron microprobe, and infrared spectroscopy analyses to map compositional variations. Magmatic and hydrothermal biotites from the andesite-dacite mineralized porphyries have higher XMg, K, and F contents and lower Fe/(Fe+Mg) ratios compared to the magmatic biotites from the andesite-dacite barren porphyries of the district Hydrothermal biotites from deep levels with potassic alteration and high Cu grades have the highest XMg ratios and high F contents. The similarity of the log fH2O/fHF, log fHF/fHCl, and log fH2O/fHCl fugacity ratios of biotites from Altar mineralized porphyries and from the neighbouring Los Pelambres porphyry copper deposit suggests that these parameters may be a function of the magmatic source. Chlorite crystals associated with Cu mineralization (0.2 to 1.2% Cu) show lower Fe andMn and higherMg contents than chlorite from shallow and distal zones. Potassic dioctahedral phyllosilicates are the most abundant phyllosilicates in the Altardeposit, occur in the phyllic and chloritic zones, and are superimposed on potassic alteration. In zones of high copper grades (N0.8% Cu), potassic dioctahedral phyllosilicates have total Al (apfu) between 2.4 and 2.8 andintermediate compositions between muscovite, phengitic muscovite, and illite, whereas those with higher and lower Al contents come from zones with lower Cu grades. Temperatures obtained from XMg-Ti equilibria in biotite (691?800 °C) and IVAl occupancy in chlorite (214? 340 °C), agreewith previous temperature estimates based on Ti in quartz and fluid inclusion microthermometry.Muscovite is stable at temperatures higher than ~300 °C, whereas phengitic muscovite indicates temperatures between 280 and 400 °C and higher K+/H+ conditions (less acidic environment) compared to muscovite. Illite represents a younger and cooler (220 to 310 °C) hydrothermal alteration event, and kaolinite in late veins halos reflects a decrease of the temperature (b200 °C) of late hydrothermal fluids. Our study demonstrates that variations in phyllosilicate composition have the potential to be used as vectors in ore exploration and to differentiate between barren and fertile intrusions. A detailed analysis of type and proportion of phyllosilicates, as well as the presence of ore minerals in fine fractions, should be undertaken to optimize metal recoveries during the upcoming benefaction of these ores.Fil: Maydagán, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Franchini, Marta Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; ArgentinaFil: Impiccini, Agnes. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; ArgentinaFil: Lentz, David. University of New Brunswick; CanadáElsevier Science2016-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/149905Maydagán, Laura; Franchini, Marta Beatriz; Impiccini, Agnes; Lentz, David; Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy; Elsevier Science; Journal of Geochemical Exploration; 167; 8-2016; 83-1090375-6742CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.gexplo.2016.05.002info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0375674216300966info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:45:06Zoai:ri.conicet.gov.ar:11336/149905instacron: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:34982025-09-03 09:45:07.247CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy |
title |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy |
spellingShingle |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy Maydagán, Laura PHYLLOSILICATES CLAYS ALTAR PORPHYRY ARGENTINA |
title_short |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy |
title_full |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy |
title_fullStr |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy |
title_full_unstemmed |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy |
title_sort |
Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy |
dc.creator.none.fl_str_mv |
Maydagán, Laura Franchini, Marta Beatriz Impiccini, Agnes Lentz, David |
author |
Maydagán, Laura |
author_facet |
Maydagán, Laura Franchini, Marta Beatriz Impiccini, Agnes Lentz, David |
author_role |
author |
author2 |
Franchini, Marta Beatriz Impiccini, Agnes Lentz, David |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
PHYLLOSILICATES CLAYS ALTAR PORPHYRY ARGENTINA |
topic |
PHYLLOSILICATES CLAYS ALTAR PORPHYRY ARGENTINA |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Biotite, chlorite, muscovite, illite, and kaolinite from the Altar porphyry Cu-(Au) deposit of the Andean Main Cordillera of San Juan Province (Argentina) were constrained using X-ray diffraction, electron microprobe, and infrared spectroscopy analyses to map compositional variations. Magmatic and hydrothermal biotites from the andesite-dacite mineralized porphyries have higher XMg, K, and F contents and lower Fe/(Fe+Mg) ratios compared to the magmatic biotites from the andesite-dacite barren porphyries of the district Hydrothermal biotites from deep levels with potassic alteration and high Cu grades have the highest XMg ratios and high F contents. The similarity of the log fH2O/fHF, log fHF/fHCl, and log fH2O/fHCl fugacity ratios of biotites from Altar mineralized porphyries and from the neighbouring Los Pelambres porphyry copper deposit suggests that these parameters may be a function of the magmatic source. Chlorite crystals associated with Cu mineralization (0.2 to 1.2% Cu) show lower Fe andMn and higherMg contents than chlorite from shallow and distal zones. Potassic dioctahedral phyllosilicates are the most abundant phyllosilicates in the Altardeposit, occur in the phyllic and chloritic zones, and are superimposed on potassic alteration. In zones of high copper grades (N0.8% Cu), potassic dioctahedral phyllosilicates have total Al (apfu) between 2.4 and 2.8 andintermediate compositions between muscovite, phengitic muscovite, and illite, whereas those with higher and lower Al contents come from zones with lower Cu grades. Temperatures obtained from XMg-Ti equilibria in biotite (691?800 °C) and IVAl occupancy in chlorite (214? 340 °C), agreewith previous temperature estimates based on Ti in quartz and fluid inclusion microthermometry.Muscovite is stable at temperatures higher than ~300 °C, whereas phengitic muscovite indicates temperatures between 280 and 400 °C and higher K+/H+ conditions (less acidic environment) compared to muscovite. Illite represents a younger and cooler (220 to 310 °C) hydrothermal alteration event, and kaolinite in late veins halos reflects a decrease of the temperature (b200 °C) of late hydrothermal fluids. Our study demonstrates that variations in phyllosilicate composition have the potential to be used as vectors in ore exploration and to differentiate between barren and fertile intrusions. A detailed analysis of type and proportion of phyllosilicates, as well as the presence of ore minerals in fine fractions, should be undertaken to optimize metal recoveries during the upcoming benefaction of these ores. Fil: Maydagán, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina Fil: Franchini, Marta Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina Fil: Impiccini, Agnes. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina Fil: Lentz, David. University of New Brunswick; Canadá |
description |
Biotite, chlorite, muscovite, illite, and kaolinite from the Altar porphyry Cu-(Au) deposit of the Andean Main Cordillera of San Juan Province (Argentina) were constrained using X-ray diffraction, electron microprobe, and infrared spectroscopy analyses to map compositional variations. Magmatic and hydrothermal biotites from the andesite-dacite mineralized porphyries have higher XMg, K, and F contents and lower Fe/(Fe+Mg) ratios compared to the magmatic biotites from the andesite-dacite barren porphyries of the district Hydrothermal biotites from deep levels with potassic alteration and high Cu grades have the highest XMg ratios and high F contents. The similarity of the log fH2O/fHF, log fHF/fHCl, and log fH2O/fHCl fugacity ratios of biotites from Altar mineralized porphyries and from the neighbouring Los Pelambres porphyry copper deposit suggests that these parameters may be a function of the magmatic source. Chlorite crystals associated with Cu mineralization (0.2 to 1.2% Cu) show lower Fe andMn and higherMg contents than chlorite from shallow and distal zones. Potassic dioctahedral phyllosilicates are the most abundant phyllosilicates in the Altardeposit, occur in the phyllic and chloritic zones, and are superimposed on potassic alteration. In zones of high copper grades (N0.8% Cu), potassic dioctahedral phyllosilicates have total Al (apfu) between 2.4 and 2.8 andintermediate compositions between muscovite, phengitic muscovite, and illite, whereas those with higher and lower Al contents come from zones with lower Cu grades. Temperatures obtained from XMg-Ti equilibria in biotite (691?800 °C) and IVAl occupancy in chlorite (214? 340 °C), agreewith previous temperature estimates based on Ti in quartz and fluid inclusion microthermometry.Muscovite is stable at temperatures higher than ~300 °C, whereas phengitic muscovite indicates temperatures between 280 and 400 °C and higher K+/H+ conditions (less acidic environment) compared to muscovite. Illite represents a younger and cooler (220 to 310 °C) hydrothermal alteration event, and kaolinite in late veins halos reflects a decrease of the temperature (b200 °C) of late hydrothermal fluids. Our study demonstrates that variations in phyllosilicate composition have the potential to be used as vectors in ore exploration and to differentiate between barren and fertile intrusions. A detailed analysis of type and proportion of phyllosilicates, as well as the presence of ore minerals in fine fractions, should be undertaken to optimize metal recoveries during the upcoming benefaction of these ores. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-08 |
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/11336/149905 Maydagán, Laura; Franchini, Marta Beatriz; Impiccini, Agnes; Lentz, David; Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy; Elsevier Science; Journal of Geochemical Exploration; 167; 8-2016; 83-109 0375-6742 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/149905 |
identifier_str_mv |
Maydagán, Laura; Franchini, Marta Beatriz; Impiccini, Agnes; Lentz, David; Phyllosilicates geochemistry and distribution in the Altar porphyry Cu-(Au) deposit, Andes Cordillera of San Juan, Argentina: Applications in exploration, geothermometry, and geometallurgy; Elsevier Science; Journal of Geochemical Exploration; 167; 8-2016; 83-109 0375-6742 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gexplo.2016.05.002 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0375674216300966 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier Science |
publisher.none.fl_str_mv |
Elsevier Science |
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) |
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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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13.13397 |