Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina)

The main stratigraphical, petrographical and structural features of the Portezuelo de Las Burras altered area, located in the Cordillera Frontal (San Juan Province, Argentina), are described. The area is composed of the La Puerta Formation (Upper Carboniferous - Lower Permian), thick volcanic and su...

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Autores principales: Karkanis, C., Rossello, E.A.
Formato: JOUR
Materias:
Argentina
Cordillera Frontal
Hydrothermal alteratiion
Mineralisation
Portezuelo de las Burras
Structural control
geochemistry
hydrothermal alteration
mineralization
ore deposit
structural control
San Juan [Argentina]
South America
Western Hemisphere
World
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v59_n1_p3_Karkanis
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v59_n1_p3_Karkanis
record_format dspace
spelling todo:paper_00044822_v59_n1_p3_Karkanis2023-10-03T13:57:53Z Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina) Karkanis, C. Rossello, E.A. Argentina Cordillera Frontal Hydrothermal alteratiion Mineralisation Portezuelo de las Burras Structural control geochemistry hydrothermal alteration mineralization ore deposit structural control Argentina San Juan [Argentina] South America Western Hemisphere World The main stratigraphical, petrographical and structural features of the Portezuelo de Las Burras altered area, located in the Cordillera Frontal (San Juan Province, Argentina), are described. The area is composed of the La Puerta Formation (Upper Carboniferous - Lower Permian), thick volcanic and subordinate sedimentary layers of the Choiyoi Group (Permian - Triassic), levels of andesitic lava of Andesita Las Vizcachas (Upper Mesozoic? - Tertiary?), more acidic rocks of the Arroyo de las Chinches Formation (Oligocene - Miocene) and andesitic rocks of Entrecordilleras Formation (Upper Miocene - Pleistocene), intruded by the Entrecordilleras stock (Neogene) and smaller dacitic bodies probably related to it. The courses of the Manantiales and Las Burras rivers are located on a main sinistral wrench zone expressed by synthetic and antithetic faults where the area next to the Portezuelo de las Burras constitutes releasing orerstep in a tectonic transfer with dilatance behavior. This structure controlled the circulation and emplacement of the mineral-bearing hydrothermal fluids, which were responsible of the chromatic, mineralogical and geochemical anomalies detected between the Portezuelo de las Burras and Cerro Manrique. The anomalies are related to argillic and siliceous hydrothermal alterations that increase the possibility of there being economic precious-mineral accumulations. © 2004 Asociación Geológica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v59_n1_p3_Karkanis
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Cordillera Frontal
Hydrothermal alteratiion
Mineralisation
Portezuelo de las Burras
Structural control
geochemistry
hydrothermal alteration
mineralization
ore deposit
structural control
Argentina
San Juan [Argentina]
South America
Western Hemisphere
World
spellingShingle Argentina
Cordillera Frontal
Hydrothermal alteratiion
Mineralisation
Portezuelo de las Burras
Structural control
geochemistry
hydrothermal alteration
mineralization
ore deposit
structural control
Argentina
San Juan [Argentina]
South America
Western Hemisphere
World
Karkanis, C.
Rossello, E.A.
Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina)
topic_facet Argentina
Cordillera Frontal
Hydrothermal alteratiion
Mineralisation
Portezuelo de las Burras
Structural control
geochemistry
hydrothermal alteration
mineralization
ore deposit
structural control
Argentina
San Juan [Argentina]
South America
Western Hemisphere
World
description The main stratigraphical, petrographical and structural features of the Portezuelo de Las Burras altered area, located in the Cordillera Frontal (San Juan Province, Argentina), are described. The area is composed of the La Puerta Formation (Upper Carboniferous - Lower Permian), thick volcanic and subordinate sedimentary layers of the Choiyoi Group (Permian - Triassic), levels of andesitic lava of Andesita Las Vizcachas (Upper Mesozoic? - Tertiary?), more acidic rocks of the Arroyo de las Chinches Formation (Oligocene - Miocene) and andesitic rocks of Entrecordilleras Formation (Upper Miocene - Pleistocene), intruded by the Entrecordilleras stock (Neogene) and smaller dacitic bodies probably related to it. The courses of the Manantiales and Las Burras rivers are located on a main sinistral wrench zone expressed by synthetic and antithetic faults where the area next to the Portezuelo de las Burras constitutes releasing orerstep in a tectonic transfer with dilatance behavior. This structure controlled the circulation and emplacement of the mineral-bearing hydrothermal fluids, which were responsible of the chromatic, mineralogical and geochemical anomalies detected between the Portezuelo de las Burras and Cerro Manrique. The anomalies are related to argillic and siliceous hydrothermal alterations that increase the possibility of there being economic precious-mineral accumulations. © 2004 Asociación Geológica Argentina.
format JOUR
author Karkanis, C.
Rossello, E.A.
author_facet Karkanis, C.
Rossello, E.A.
author_sort Karkanis, C.
title Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina)
title_short Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina)
title_full Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina)
title_fullStr Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina)
title_full_unstemmed Geology and structural controls on areas of alteration of Portezuelo de las Burras (Cordillera Frontal, San Juan Argentina)
title_sort geology and structural controls on areas of alteration of portezuelo de las burras (cordillera frontal, san juan argentina)
url http://hdl.handle.net/20.500.12110/paper_00044822_v59_n1_p3_Karkanis
work_keys_str_mv AT karkanisc geologyandstructuralcontrolsonareasofalterationofportezuelodelasburrascordillerafrontalsanjuanargentina
AT rosselloea geologyandstructuralcontrolsonareasofalterationofportezuelodelasburrascordillerafrontalsanjuanargentina
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