Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina
The manganese mineralization studied in this paper represents the major concentration of this element in Argentina. It occurs in an area of 70 x 30 km, in the Sierras Pampeanas ranges, located in the provinces of Córdoba and Santiago del Estero. The analyzed area represents about 30% of the entire m...
Guardado en:
| Autor principal: | |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00206814_v46_n1_p75_Leal |
| Aporte de: |
| id |
todo:paper_00206814_v46_n1_p75_Leal |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_00206814_v46_n1_p75_Leal2023-10-03T14:17:35Z Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina Leal, P.R. epithermal deposit geochemistry hydrothermal system manganese oxide mineralization mineralogy ore deposit Argentina Sierras Pampeanas South America The manganese mineralization studied in this paper represents the major concentration of this element in Argentina. It occurs in an area of 70 x 30 km, in the Sierras Pampeanas ranges, located in the provinces of Córdoba and Santiago del Estero. The analyzed area represents about 30% of the entire mineralized system. It is quite unusual because it is hosted in granodioritic and rhyodacitic rocks. Geochemical, petrological, and structural analyses demonstrate that these rocks are unrelated to the mineralization. The geometry and distribution of the veins are mainly controlled by faults, where the manganese is found mainly as fault-breccia cement. These faults are the result of a dextral shear system that produced Riedel-type structures related to N-S lineaments. Textural and structural analyses of the veins indicate four deformational events. Ore minerals precipitated during the first three events, whereas the gangue was mainly formed during the last episode. X-ray diffraction and microprobe studies show that Mn4+ oxides (hollandite, pyrolusite, ramsdellite, romanèchite, cryptomelane, and coronadite) associated with Fe3+ oxides (goethite and hematite) are the ore minerals. The gangue consists of calcite, opal, and lesser amounts of barite, fluorite, and clay minerals. The studied area represents shallow levels of an epithermal ore deposit; hence, it is possible to predict that these veins may continue to deeper levels. © 2004 Taylor & Francis Group, LLC. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00206814_v46_n1_p75_Leal |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
epithermal deposit geochemistry hydrothermal system manganese oxide mineralization mineralogy ore deposit Argentina Sierras Pampeanas South America |
| spellingShingle |
epithermal deposit geochemistry hydrothermal system manganese oxide mineralization mineralogy ore deposit Argentina Sierras Pampeanas South America Leal, P.R. Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina |
| topic_facet |
epithermal deposit geochemistry hydrothermal system manganese oxide mineralization mineralogy ore deposit Argentina Sierras Pampeanas South America |
| description |
The manganese mineralization studied in this paper represents the major concentration of this element in Argentina. It occurs in an area of 70 x 30 km, in the Sierras Pampeanas ranges, located in the provinces of Córdoba and Santiago del Estero. The analyzed area represents about 30% of the entire mineralized system. It is quite unusual because it is hosted in granodioritic and rhyodacitic rocks. Geochemical, petrological, and structural analyses demonstrate that these rocks are unrelated to the mineralization. The geometry and distribution of the veins are mainly controlled by faults, where the manganese is found mainly as fault-breccia cement. These faults are the result of a dextral shear system that produced Riedel-type structures related to N-S lineaments. Textural and structural analyses of the veins indicate four deformational events. Ore minerals precipitated during the first three events, whereas the gangue was mainly formed during the last episode. X-ray diffraction and microprobe studies show that Mn4+ oxides (hollandite, pyrolusite, ramsdellite, romanèchite, cryptomelane, and coronadite) associated with Fe3+ oxides (goethite and hematite) are the ore minerals. The gangue consists of calcite, opal, and lesser amounts of barite, fluorite, and clay minerals. The studied area represents shallow levels of an epithermal ore deposit; hence, it is possible to predict that these veins may continue to deeper levels. © 2004 Taylor & Francis Group, LLC. |
| format |
JOUR |
| author |
Leal, P.R. |
| author_facet |
Leal, P.R. |
| author_sort |
Leal, P.R. |
| title |
Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina |
| title_short |
Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina |
| title_full |
Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina |
| title_fullStr |
Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina |
| title_full_unstemmed |
Mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, Argentina |
| title_sort |
mineralogy and geochemistry of an epithermal manganese district, sierras pampeanas, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_00206814_v46_n1_p75_Leal |
| work_keys_str_mv |
AT lealpr mineralogyandgeochemistryofanepithermalmanganesedistrictsierraspampeanasargentina |
| _version_ |
1807317330422661120 |