The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza
The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza. The Arroyo La Chilca-Zanjón del Buitre alteration zone is located in the San Rafael Massif (35°24'8" S; 68°19'25,8" W), Mendoza. Previous works defined preliminary this deposit as a porphyry coppe...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00044822_v69_n2_p287_Rubinstein https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v69_n2_p287_Rubinstein_oai |
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I28-R145-paper_00044822_v69_n2_p287_Rubinstein_oai2024-08-16 Rubinstein, N. Gómez, A. Mallimacci, H. 2012 The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza. The Arroyo La Chilca-Zanjón del Buitre alteration zone is located in the San Rafael Massif (35°24'8" S; 68°19'25,8" W), Mendoza. Previous works defined preliminary this deposit as a porphyry copper system genetically linked to the gondwanan magmatism. This alteration zone is hosted by a sequence composed of ignimbritic breccias and ignimbrites of trachyandesitic composition with interbedded tuffaceous sandstones and andesitic lavas flows intruded by trachyandesitic-dacitic and andesitic hypabyssal bodies. The lithology and geochemistry of the volcanic sequence confirm the link with the Choiyoi Magmatic Cycle lower section (Lower Permian). The alteration zone consists of a potassic halo with a parageneses of K-feldspar-quartzmagnetite overprinted by phyllic alteration with an assemblage of quartz-muscovite-pyrite-(rutile) and quartz -pyrite veins. A late carbonatization process overprints both the potassic and phyllic alteration. Outside the alteration zone pyrite-chalcopyrite- galena-sphalerite veins with quartz gangue crop out. Metals geochemistry shows moderate Ag and Au anomalies and little Cu, Mo, Pb and Zn anomalies. Statistical analyses allow defining one Cu-Mo mineralizing stage and another Mo mineralizing stage only recognized in Zanjón del Buitre. Moreover, two Zn mineralizing stages, one of them probably genetically related to the Cu stage, were also recognized. Fil:Rubinstein, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gómez, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v69_n2_p287_Rubinstein info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 2012;69(2):287-295 Choiyoi Magmatic Cycle lower section Hydrothermal alteration Metals geochemistry Porphyry copper San rafael massif breccia copper geochemistry hydrothermal alteration ignimbrite lava flow magmatism mineralization ore deposit Permian porphyry quartz vein sandstone Argentina Mendoza San Rafael Massif The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v69_n2_p287_Rubinstein_oai |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-145 |
| collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
| topic |
Choiyoi Magmatic Cycle lower section Hydrothermal alteration Metals geochemistry Porphyry copper San rafael massif breccia copper geochemistry hydrothermal alteration ignimbrite lava flow magmatism mineralization ore deposit Permian porphyry quartz vein sandstone Argentina Mendoza San Rafael Massif |
| spellingShingle |
Choiyoi Magmatic Cycle lower section Hydrothermal alteration Metals geochemistry Porphyry copper San rafael massif breccia copper geochemistry hydrothermal alteration ignimbrite lava flow magmatism mineralization ore deposit Permian porphyry quartz vein sandstone Argentina Mendoza San Rafael Massif Rubinstein, N. Gómez, A. Mallimacci, H. The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza |
| topic_facet |
Choiyoi Magmatic Cycle lower section Hydrothermal alteration Metals geochemistry Porphyry copper San rafael massif breccia copper geochemistry hydrothermal alteration ignimbrite lava flow magmatism mineralization ore deposit Permian porphyry quartz vein sandstone Argentina Mendoza San Rafael Massif |
| description |
The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza. The Arroyo La Chilca-Zanjón del Buitre alteration zone is located in the San Rafael Massif (35°24'8" S; 68°19'25,8" W), Mendoza. Previous works defined preliminary this deposit as a porphyry copper system genetically linked to the gondwanan magmatism. This alteration zone is hosted by a sequence composed of ignimbritic breccias and ignimbrites of trachyandesitic composition with interbedded tuffaceous sandstones and andesitic lavas flows intruded by trachyandesitic-dacitic and andesitic hypabyssal bodies. The lithology and geochemistry of the volcanic sequence confirm the link with the Choiyoi Magmatic Cycle lower section (Lower Permian). The alteration zone consists of a potassic halo with a parageneses of K-feldspar-quartzmagnetite overprinted by phyllic alteration with an assemblage of quartz-muscovite-pyrite-(rutile) and quartz -pyrite veins. A late carbonatization process overprints both the potassic and phyllic alteration. Outside the alteration zone pyrite-chalcopyrite- galena-sphalerite veins with quartz gangue crop out. Metals geochemistry shows moderate Ag and Au anomalies and little Cu, Mo, Pb and Zn anomalies. Statistical analyses allow defining one Cu-Mo mineralizing stage and another Mo mineralizing stage only recognized in Zanjón del Buitre. Moreover, two Zn mineralizing stages, one of them probably genetically related to the Cu stage, were also recognized. |
| format |
Artículo Artículo publishedVersion |
| author |
Rubinstein, N. Gómez, A. Mallimacci, H. |
| author_facet |
Rubinstein, N. Gómez, A. Mallimacci, H. |
| author_sort |
Rubinstein, N. |
| title |
The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza |
| title_short |
The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza |
| title_full |
The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza |
| title_fullStr |
The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza |
| title_full_unstemmed |
The Arroyo La Chilca-Zanjón del Buitre alteration zone, San Rafael Massif, Mendoza |
| title_sort |
arroyo la chilca-zanjón del buitre alteration zone, san rafael massif, mendoza |
| publishDate |
2012 |
| url |
http://hdl.handle.net/20.500.12110/paper_00044822_v69_n2_p287_Rubinstein https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v69_n2_p287_Rubinstein_oai |
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