The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes
Altar (31° 29' S, 70° 28' W) is a large porphyry Cu-(Au-Mo) deposit with associated epithermal Au-(Ag- Cu) veins located in the Cordillera Principal of southwest San Juan province (Argentina). Altar is a complex magmatic-hydrothermal system formed from several magmatic and hydrothermal pul...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2014 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/77553 |
| Acceso en línea: | http://hdl.handle.net/11336/77553 |
| Access Level: | acceso abierto |
| Palabra clave: | Porphyry Copper La-Icpms U-Pb Ages Magmatic Recharge Argentina https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| id |
AR_f6fdc8e6fe6c8a5b0326e05ea3091a34 |
|---|---|
| oai_identifier_str |
oai:ri.conicet.gov.ar:11336/77553 |
| network_acronym_str |
AR |
| network_name_str |
Argentina |
| repository_id_str |
|
| spelling |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processesMaydagán, LauraFranchini, Marta BeatrizChiaradia, MassimoDilles, JohnRey, RogerPorphyry CopperLa-Icpms U-Pb AgesMagmatic RechargeArgentinahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Altar (31° 29' S, 70° 28' W) is a large porphyry Cu-(Au-Mo) deposit with associated epithermal Au-(Ag- Cu) veins located in the Cordillera Principal of southwest San Juan province (Argentina). Altar is a complex magmatic-hydrothermal system formed from several magmatic and hydrothermal pulses during the middlelate Miocene. New LA-ICPMS U-Pb ages in zircons from the Altar porphyries indicate four discrete events of intrusions over an extended magmatic life time of ca. 3 m.y. It comprises a premineralization porphyry (11.75 ± 0.24 Ma), three mineralized porphyries (11.62 ± 0.21 and 11.68 ± 0.27 Ma, 11.13 ± 0.26 Ma, 10.35 ± 0.32 Ma) related to hydrothermal breccias, two postmineralization intrusions, and a postmineralization breccia (8.9 ± 0.4 Ma). The three mineralized porphyries (porphyries 2, 3, and 4) were emplaced within ∼0.7 to 1.3 m.y. Amphibole phenocrysts from the porphyries crystallized from oxidized magmas (fO2 = NNO +1 to +2) at temperatures of 780° to 850°C and pressures between 0.9 and 1.8 kbars corresponding to depths of ∼4 to 7 km. Anorthite- and Fe-rich rims in the plagioclase phenocrysts suggest that the magmatic chambers were episodically recharged by a less evolved magma. The middle-late Miocene intrusions are interpreted to have been derived from a deeper and relatively large magmatic reservoir that supplied magmas to smaller chambers located in the upper crust. The focused magmatic output to shallow levels during a period of a few million years in the Altar area has been a main requirement in the formation of this large porphyry copper deposit.Fil: Maydagán, Laura. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Franchini, Marta Beatriz. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Chiaradia, Massimo. Universidad de Ginebra. Facultad de Ciencias; SuizaFil: Dilles, John. State University of Oregon; Estados UnidosFil: Rey, Roger. Peregrine Metals Ltd.; ArgentinaSociety of Economic Geologists2014-05info: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/11336/77553Maydagán, Laura; Franchini, Marta Beatriz; Chiaradia, Massimo; Dilles, John; Rey, Roger; The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes; Society of Economic Geologists; Economic Geology and the Bulletin of the Society of Economic Geologists; 109; 3; 5-2014; 621-6410361-01281554-0774CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.2113/econgeo.109.3.621info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/segweb/economicgeology/article/109/3/621-641/128584info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T13:39:38Zoai:ri.conicet.gov.ar:11336/77553instacron: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:34982024-05-08 13:39:38.545CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes |
| title |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes |
| spellingShingle |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes Maydagán, Laura Porphyry Copper La-Icpms U-Pb Ages Magmatic Recharge Argentina https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| title_short |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes |
| title_full |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes |
| title_fullStr |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes |
| title_full_unstemmed |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes |
| title_sort |
The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes |
| dc.creator.none.fl_str_mv |
Maydagán, Laura Franchini, Marta Beatriz Chiaradia, Massimo Dilles, John Rey, Roger |
| author |
Maydagán, Laura |
| author_facet |
Maydagán, Laura Franchini, Marta Beatriz Chiaradia, Massimo Dilles, John Rey, Roger |
| author_role |
author |
| author2 |
Franchini, Marta Beatriz Chiaradia, Massimo Dilles, John Rey, Roger |
| author2_role |
author author author author |
| dc.subject.none.fl_str_mv |
Porphyry Copper La-Icpms U-Pb Ages Magmatic Recharge Argentina https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| topic |
Porphyry Copper La-Icpms U-Pb Ages Magmatic Recharge Argentina https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| description |
Altar (31° 29' S, 70° 28' W) is a large porphyry Cu-(Au-Mo) deposit with associated epithermal Au-(Ag- Cu) veins located in the Cordillera Principal of southwest San Juan province (Argentina). Altar is a complex magmatic-hydrothermal system formed from several magmatic and hydrothermal pulses during the middlelate Miocene. New LA-ICPMS U-Pb ages in zircons from the Altar porphyries indicate four discrete events of intrusions over an extended magmatic life time of ca. 3 m.y. It comprises a premineralization porphyry (11.75 ± 0.24 Ma), three mineralized porphyries (11.62 ± 0.21 and 11.68 ± 0.27 Ma, 11.13 ± 0.26 Ma, 10.35 ± 0.32 Ma) related to hydrothermal breccias, two postmineralization intrusions, and a postmineralization breccia (8.9 ± 0.4 Ma). The three mineralized porphyries (porphyries 2, 3, and 4) were emplaced within ∼0.7 to 1.3 m.y. Amphibole phenocrysts from the porphyries crystallized from oxidized magmas (fO2 = NNO +1 to +2) at temperatures of 780° to 850°C and pressures between 0.9 and 1.8 kbars corresponding to depths of ∼4 to 7 km. Anorthite- and Fe-rich rims in the plagioclase phenocrysts suggest that the magmatic chambers were episodically recharged by a less evolved magma. The middle-late Miocene intrusions are interpreted to have been derived from a deeper and relatively large magmatic reservoir that supplied magmas to smaller chambers located in the upper crust. The focused magmatic output to shallow levels during a period of a few million years in the Altar area has been a main requirement in the formation of this large porphyry copper deposit. |
| publishDate |
2014 |
| dc.date.none.fl_str_mv |
2014-05 |
| 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/11336/77553 Maydagán, Laura; Franchini, Marta Beatriz; Chiaradia, Massimo; Dilles, John; Rey, Roger; The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes; Society of Economic Geologists; Economic Geology and the Bulletin of the Society of Economic Geologists; 109; 3; 5-2014; 621-641 0361-0128 1554-0774 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/77553 |
| identifier_str_mv |
Maydagán, Laura; Franchini, Marta Beatriz; Chiaradia, Massimo; Dilles, John; Rey, Roger; The Altar porphyry Cu-(Au-Mo) deposit (Argentina): A complex magmatic-hydrothermal system with evidence of recharge processes; Society of Economic Geologists; Economic Geology and the Bulletin of the Society of Economic Geologists; 109; 3; 5-2014; 621-641 0361-0128 1554-0774 CONICET Digital CONICET |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
| dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.2113/econgeo.109.3.621 info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/segweb/economicgeology/article/109/3/621-641/128584 |
| 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 application/pdf |
| dc.publisher.none.fl_str_mv |
Society of Economic Geologists |
| publisher.none.fl_str_mv |
Society of Economic Geologists |
| dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
| instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
| reponame_str |
CONICET Digital (CONICET) |
| collection |
CONICET Digital (CONICET) |
| 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 |
| _version_ |
1799194942663294976 |
| score |
15,81155 |