Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina
El Pachón is a porphyry copper-molybdenum deposit located at southwest of San Juan province, near the border with Chile. This deposit is hosted by a volcanic sequence of andesites and rhyolites-rhyodacites (Pachón Formation) with a Late Cretaceous-early Miocene age. This volcanic sequence is intrude...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n1_p39_Torres http://hdl.handle.net/20.500.12110/paper_00044822_v75_n1_p39_Torres |
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paper:paper_00044822_v75_n1_p39_Torres2023-06-08T14:27:02Z Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina Breccias Cordillera Principal Cu (Mo) porphyry deposit Hydrothermal alteration Ore paragenesis breccia copper hydrothermal alteration lithology mineralization molybdenum ore deposit paragenesis porphyry Argentina San Juan [Argentina] El Pachón is a porphyry copper-molybdenum deposit located at southwest of San Juan province, near the border with Chile. This deposit is hosted by a volcanic sequence of andesites and rhyolites-rhyodacites (Pachón Formation) with a Late Cretaceous-early Miocene age. This volcanic sequence is intruded by Miocene diorite-tonalite intrusives (Diorita Pachón), which are genetically linked to the mineralization, and by late dacitic porphyries. Petro-mineralogical studies of surface and drilling samples allow us to define alteration assemblages of typical porphyry deposits. The hydrothermal system started with a potassic stage with an assemblage of K-feldspar-biotite (quartz) with a pervasive distribution and A, EB and B veinlets with an associated ore paragenesis consisting of chalcopyrite-pyrite ± (molybdenite-bornite). During this stage, a breccia consisting of a first stage pf brecciation with quartz cement and a second stage of brecciation with a tourmaline cement was formed (Breccia South). Later on there was a phyllic stage with an assemblage of quartz-sericite-pyrite-(chlorite) with a pervasive distribution and D veinlets. The hydrothermal processes continues and is evidenced by a barren tourmaline stage that developed a breccia body (Breccia North). A propylitic alteration with an assemblage of chlorite-epidote-calcite with pervasive and in veinlets distribution developed around the phyllic halo. © 2018, Taylor and Francis Ltd. All rights reserved. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n1_p39_Torres http://hdl.handle.net/20.500.12110/paper_00044822_v75_n1_p39_Torres |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Breccias Cordillera Principal Cu (Mo) porphyry deposit Hydrothermal alteration Ore paragenesis breccia copper hydrothermal alteration lithology mineralization molybdenum ore deposit paragenesis porphyry Argentina San Juan [Argentina] |
| spellingShingle |
Breccias Cordillera Principal Cu (Mo) porphyry deposit Hydrothermal alteration Ore paragenesis breccia copper hydrothermal alteration lithology mineralization molybdenum ore deposit paragenesis porphyry Argentina San Juan [Argentina] Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina |
| topic_facet |
Breccias Cordillera Principal Cu (Mo) porphyry deposit Hydrothermal alteration Ore paragenesis breccia copper hydrothermal alteration lithology mineralization molybdenum ore deposit paragenesis porphyry Argentina San Juan [Argentina] |
| description |
El Pachón is a porphyry copper-molybdenum deposit located at southwest of San Juan province, near the border with Chile. This deposit is hosted by a volcanic sequence of andesites and rhyolites-rhyodacites (Pachón Formation) with a Late Cretaceous-early Miocene age. This volcanic sequence is intruded by Miocene diorite-tonalite intrusives (Diorita Pachón), which are genetically linked to the mineralization, and by late dacitic porphyries. Petro-mineralogical studies of surface and drilling samples allow us to define alteration assemblages of typical porphyry deposits. The hydrothermal system started with a potassic stage with an assemblage of K-feldspar-biotite (quartz) with a pervasive distribution and A, EB and B veinlets with an associated ore paragenesis consisting of chalcopyrite-pyrite ± (molybdenite-bornite). During this stage, a breccia consisting of a first stage pf brecciation with quartz cement and a second stage of brecciation with a tourmaline cement was formed (Breccia South). Later on there was a phyllic stage with an assemblage of quartz-sericite-pyrite-(chlorite) with a pervasive distribution and D veinlets. The hydrothermal processes continues and is evidenced by a barren tourmaline stage that developed a breccia body (Breccia North). A propylitic alteration with an assemblage of chlorite-epidote-calcite with pervasive and in veinlets distribution developed around the phyllic halo. © 2018, Taylor and Francis Ltd. All rights reserved. |
| title |
Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina |
| title_short |
Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina |
| title_full |
Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina |
| title_fullStr |
Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina |
| title_full_unstemmed |
Lithology, mineralization and alteration of the el Pachón deposit, San Juan province, Argentina |
| title_sort |
lithology, mineralization and alteration of the el pachón deposit, san juan province, argentina |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n1_p39_Torres http://hdl.handle.net/20.500.12110/paper_00044822_v75_n1_p39_Torres |
| _version_ |
1768544065204256768 |