Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina

Autores
Biel, C.; Subías, I.; Acevedo, Rogelio Daniel; Yusta, I.; Velasco, F.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Arroyo Rojo Zn-Pb-Cu volcanogenic massive sulfide deposit is the main deposit of the Fin del Mundo District in the Fuegian Andes, Argentina. This deposit is hosted by a Middle Jurassic volcanic and volcanoclastic sequence forming the Lemaire Formation. The latter consists, from the base up, of the following: rhyolitic and dacitic porphyritic rocks, ignimbrite, tuff, and flow. It is underlain by a pre-Jurassic basement and overlain by the hyaloclastic andesites of the Yahgán Formation. The Arroyo Rojo consists of stacked lenticular lenses that are associated with disseminated mineralization in both the footwall and the hanging wall. The internal structure of the ore lenses is marked by the occurrence of massive, semimassive and banded facies, along with stringer and brecciated zones and minor ore disseminations. The mineral assemblage comprises mainly pyrite and sphalerite, with minor amounts of galena and chalcopyrite and rare pyrrhotite, arsenopyrite, tetrahedrite and bournonite. The ores and the volcanic host-rocks have metamorphosed to greenschist facies and were overprinted by a penetrative tectonic foliation, which led to the development of mylonitic and cataclastic textures, recrystallization and remobilization. Primary depositional characteristics and regional and hydrothermal alteration patterns were preserved despite deformation and metamorphism. Therefore, primary banding was preserved between facies boundaries. In addition, some remnants of magmatic origin are recognizable in preserved phenocrysts and volcaniclastic phenoclasts. Most of the volcanic and volcaniclastic rocks of the host sequence show a rhyolitic to rhyo-dacitic composition and a subalkaline, tholeitic to intermediate geochemical magmatic signature. Regional seafloor alteration, characterized by the presence of clinozoisite, Fe-chlorite and titanite, along with quartz and albite, is partially obliterated by hydrothermal alteration. The hydrothermal alteration is stratabound with the following assemblages, which developed from the base to top: (1) Quartz-Chlorite ± Sericite, (2) Quartz-Chlorite, (3) Chlorite ± Quartz- Sericite-Calcite, (4) Quartz-Chlorite ± Calcite and (5) Sericite + Quartz ± Chlorite ± Calcite. Magnesium-chlorite and phengitic white mica typically occur in the vicinity of the Arroyo Rojo ore lenses. Mass balance calculations show a high mobility of major oxides, mainly associated with chloritic alteration, with strong enrichment in MgO, Fe2O3, Cu and S. An increase in MgO content has also been associated with the sericite alteration in conjunction with Na2O and As mass losses. To provide field criteria for exploration vectoring, the chemical composition of chlorite and the phengitic and paragonitic content of the white mica were determined and correlated with PIMA Fe-OH and Al-OH absorption wavelengths, respectively, relative to their proximity to the mineralized lenses. The results of this study can be used to help identify (1) felsic proximal facies associations, (2) ore horizons and (3) favorable hydrothermal alteration zones in other parts of the Fin del Mundo district.
Fil: Biel, C.. Universidad de Zaragoza; España. Productos Minerales para la Industria S.A.; España
Fil: Subías, I.. Universidad de Zaragoza; España
Fil: Acevedo, Rogelio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Yusta, I.. Universidad del Pais Vasco; España
Fil: Velasco, F.. Universidad del Pais Vasco; España
Materia
Vms
Lemaire Formation
Mineralogy
Fuegian Andes
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:11336/5432

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spelling Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, ArgentinaBiel, C.Subías, I.Acevedo, Rogelio DanielYusta, I.Velasco, F.VmsLemaire FormationMineralogyFuegian Andeshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Arroyo Rojo Zn-Pb-Cu volcanogenic massive sulfide deposit is the main deposit of the Fin del Mundo District in the Fuegian Andes, Argentina. This deposit is hosted by a Middle Jurassic volcanic and volcanoclastic sequence forming the Lemaire Formation. The latter consists, from the base up, of the following: rhyolitic and dacitic porphyritic rocks, ignimbrite, tuff, and flow. It is underlain by a pre-Jurassic basement and overlain by the hyaloclastic andesites of the Yahgán Formation. The Arroyo Rojo consists of stacked lenticular lenses that are associated with disseminated mineralization in both the footwall and the hanging wall. The internal structure of the ore lenses is marked by the occurrence of massive, semimassive and banded facies, along with stringer and brecciated zones and minor ore disseminations. The mineral assemblage comprises mainly pyrite and sphalerite, with minor amounts of galena and chalcopyrite and rare pyrrhotite, arsenopyrite, tetrahedrite and bournonite. The ores and the volcanic host-rocks have metamorphosed to greenschist facies and were overprinted by a penetrative tectonic foliation, which led to the development of mylonitic and cataclastic textures, recrystallization and remobilization. Primary depositional characteristics and regional and hydrothermal alteration patterns were preserved despite deformation and metamorphism. Therefore, primary banding was preserved between facies boundaries. In addition, some remnants of magmatic origin are recognizable in preserved phenocrysts and volcaniclastic phenoclasts. Most of the volcanic and volcaniclastic rocks of the host sequence show a rhyolitic to rhyo-dacitic composition and a subalkaline, tholeitic to intermediate geochemical magmatic signature. Regional seafloor alteration, characterized by the presence of clinozoisite, Fe-chlorite and titanite, along with quartz and albite, is partially obliterated by hydrothermal alteration. The hydrothermal alteration is stratabound with the following assemblages, which developed from the base to top: (1) Quartz-Chlorite ± Sericite, (2) Quartz-Chlorite, (3) Chlorite ± Quartz- Sericite-Calcite, (4) Quartz-Chlorite ± Calcite and (5) Sericite + Quartz ± Chlorite ± Calcite. Magnesium-chlorite and phengitic white mica typically occur in the vicinity of the Arroyo Rojo ore lenses. Mass balance calculations show a high mobility of major oxides, mainly associated with chloritic alteration, with strong enrichment in MgO, Fe2O3, Cu and S. An increase in MgO content has also been associated with the sericite alteration in conjunction with Na2O and As mass losses. To provide field criteria for exploration vectoring, the chemical composition of chlorite and the phengitic and paragonitic content of the white mica were determined and correlated with PIMA Fe-OH and Al-OH absorption wavelengths, respectively, relative to their proximity to the mineralized lenses. The results of this study can be used to help identify (1) felsic proximal facies associations, (2) ore horizons and (3) favorable hydrothermal alteration zones in other parts of the Fin del Mundo district.Fil: Biel, C.. Universidad de Zaragoza; España. Productos Minerales para la Industria S.A.; EspañaFil: Subías, I.. Universidad de Zaragoza; EspañaFil: Acevedo, Rogelio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Yusta, I.. Universidad del Pais Vasco; EspañaFil: Velasco, F.. Universidad del Pais Vasco; EspañaElsevier2012-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/5432Biel, C.; Subías, I.; Acevedo, Rogelio Daniel; Yusta, I.; Velasco, F.; Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina; Elsevier; Journal of South American Earth Sciences; 35; 1-2012; 62-730895-9811enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0895981111001568info:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2011.11.005info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:52:10Zoai:ri.conicet.gov.ar:11336/5432instacron: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 09:52:11.23CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
title Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
spellingShingle Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
Biel, C.
Vms
Lemaire Formation
Mineralogy
Fuegian Andes
title_short Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
title_full Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
title_fullStr Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
title_full_unstemmed Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
title_sort Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina
dc.creator.none.fl_str_mv Biel, C.
Subías, I.
Acevedo, Rogelio Daniel
Yusta, I.
Velasco, F.
author Biel, C.
author_facet Biel, C.
Subías, I.
Acevedo, Rogelio Daniel
Yusta, I.
Velasco, F.
author_role author
author2 Subías, I.
Acevedo, Rogelio Daniel
Yusta, I.
Velasco, F.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Vms
Lemaire Formation
Mineralogy
Fuegian Andes
topic Vms
Lemaire Formation
Mineralogy
Fuegian Andes
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 Arroyo Rojo Zn-Pb-Cu volcanogenic massive sulfide deposit is the main deposit of the Fin del Mundo District in the Fuegian Andes, Argentina. This deposit is hosted by a Middle Jurassic volcanic and volcanoclastic sequence forming the Lemaire Formation. The latter consists, from the base up, of the following: rhyolitic and dacitic porphyritic rocks, ignimbrite, tuff, and flow. It is underlain by a pre-Jurassic basement and overlain by the hyaloclastic andesites of the Yahgán Formation. The Arroyo Rojo consists of stacked lenticular lenses that are associated with disseminated mineralization in both the footwall and the hanging wall. The internal structure of the ore lenses is marked by the occurrence of massive, semimassive and banded facies, along with stringer and brecciated zones and minor ore disseminations. The mineral assemblage comprises mainly pyrite and sphalerite, with minor amounts of galena and chalcopyrite and rare pyrrhotite, arsenopyrite, tetrahedrite and bournonite. The ores and the volcanic host-rocks have metamorphosed to greenschist facies and were overprinted by a penetrative tectonic foliation, which led to the development of mylonitic and cataclastic textures, recrystallization and remobilization. Primary depositional characteristics and regional and hydrothermal alteration patterns were preserved despite deformation and metamorphism. Therefore, primary banding was preserved between facies boundaries. In addition, some remnants of magmatic origin are recognizable in preserved phenocrysts and volcaniclastic phenoclasts. Most of the volcanic and volcaniclastic rocks of the host sequence show a rhyolitic to rhyo-dacitic composition and a subalkaline, tholeitic to intermediate geochemical magmatic signature. Regional seafloor alteration, characterized by the presence of clinozoisite, Fe-chlorite and titanite, along with quartz and albite, is partially obliterated by hydrothermal alteration. The hydrothermal alteration is stratabound with the following assemblages, which developed from the base to top: (1) Quartz-Chlorite ± Sericite, (2) Quartz-Chlorite, (3) Chlorite ± Quartz- Sericite-Calcite, (4) Quartz-Chlorite ± Calcite and (5) Sericite + Quartz ± Chlorite ± Calcite. Magnesium-chlorite and phengitic white mica typically occur in the vicinity of the Arroyo Rojo ore lenses. Mass balance calculations show a high mobility of major oxides, mainly associated with chloritic alteration, with strong enrichment in MgO, Fe2O3, Cu and S. An increase in MgO content has also been associated with the sericite alteration in conjunction with Na2O and As mass losses. To provide field criteria for exploration vectoring, the chemical composition of chlorite and the phengitic and paragonitic content of the white mica were determined and correlated with PIMA Fe-OH and Al-OH absorption wavelengths, respectively, relative to their proximity to the mineralized lenses. The results of this study can be used to help identify (1) felsic proximal facies associations, (2) ore horizons and (3) favorable hydrothermal alteration zones in other parts of the Fin del Mundo district.
Fil: Biel, C.. Universidad de Zaragoza; España. Productos Minerales para la Industria S.A.; España
Fil: Subías, I.. Universidad de Zaragoza; España
Fil: Acevedo, Rogelio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
Fil: Yusta, I.. Universidad del Pais Vasco; España
Fil: Velasco, F.. Universidad del Pais Vasco; España
description The Arroyo Rojo Zn-Pb-Cu volcanogenic massive sulfide deposit is the main deposit of the Fin del Mundo District in the Fuegian Andes, Argentina. This deposit is hosted by a Middle Jurassic volcanic and volcanoclastic sequence forming the Lemaire Formation. The latter consists, from the base up, of the following: rhyolitic and dacitic porphyritic rocks, ignimbrite, tuff, and flow. It is underlain by a pre-Jurassic basement and overlain by the hyaloclastic andesites of the Yahgán Formation. The Arroyo Rojo consists of stacked lenticular lenses that are associated with disseminated mineralization in both the footwall and the hanging wall. The internal structure of the ore lenses is marked by the occurrence of massive, semimassive and banded facies, along with stringer and brecciated zones and minor ore disseminations. The mineral assemblage comprises mainly pyrite and sphalerite, with minor amounts of galena and chalcopyrite and rare pyrrhotite, arsenopyrite, tetrahedrite and bournonite. The ores and the volcanic host-rocks have metamorphosed to greenschist facies and were overprinted by a penetrative tectonic foliation, which led to the development of mylonitic and cataclastic textures, recrystallization and remobilization. Primary depositional characteristics and regional and hydrothermal alteration patterns were preserved despite deformation and metamorphism. Therefore, primary banding was preserved between facies boundaries. In addition, some remnants of magmatic origin are recognizable in preserved phenocrysts and volcaniclastic phenoclasts. Most of the volcanic and volcaniclastic rocks of the host sequence show a rhyolitic to rhyo-dacitic composition and a subalkaline, tholeitic to intermediate geochemical magmatic signature. Regional seafloor alteration, characterized by the presence of clinozoisite, Fe-chlorite and titanite, along with quartz and albite, is partially obliterated by hydrothermal alteration. The hydrothermal alteration is stratabound with the following assemblages, which developed from the base to top: (1) Quartz-Chlorite ± Sericite, (2) Quartz-Chlorite, (3) Chlorite ± Quartz- Sericite-Calcite, (4) Quartz-Chlorite ± Calcite and (5) Sericite + Quartz ± Chlorite ± Calcite. Magnesium-chlorite and phengitic white mica typically occur in the vicinity of the Arroyo Rojo ore lenses. Mass balance calculations show a high mobility of major oxides, mainly associated with chloritic alteration, with strong enrichment in MgO, Fe2O3, Cu and S. An increase in MgO content has also been associated with the sericite alteration in conjunction with Na2O and As mass losses. To provide field criteria for exploration vectoring, the chemical composition of chlorite and the phengitic and paragonitic content of the white mica were determined and correlated with PIMA Fe-OH and Al-OH absorption wavelengths, respectively, relative to their proximity to the mineralized lenses. The results of this study can be used to help identify (1) felsic proximal facies associations, (2) ore horizons and (3) favorable hydrothermal alteration zones in other parts of the Fin del Mundo district.
publishDate 2012
dc.date.none.fl_str_mv 2012-01
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/11336/5432
Biel, C.; Subías, I.; Acevedo, Rogelio Daniel; Yusta, I.; Velasco, F.; Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina; Elsevier; Journal of South American Earth Sciences; 35; 1-2012; 62-73
0895-9811
url http://hdl.handle.net/11336/5432
identifier_str_mv Biel, C.; Subías, I.; Acevedo, Rogelio Daniel; Yusta, I.; Velasco, F.; Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina; Elsevier; Journal of South American Earth Sciences; 35; 1-2012; 62-73
0895-9811
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/doi/
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2011.11.005
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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