The manganese deposits of the Pampean Ranges, Argentina
The example of manganese mineralization studied in this paper makes up the major concentration of this element in Argentina. It comprises an area of 70 by 30 km in the eastern Sierras Pampeanas, located in Córdoba and Santiago del Estero provinces. It is quite unusual since it is hosted in granodior...
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todo:paper_00084476_v46_n5_p1215_Leal2023-10-03T14:06:09Z The manganese deposits of the Pampean Ranges, Argentina Leal, P.R. Correa, M.J. Ametrano, S.J. Etcheverry, R.O. De Brodtkorb, M.K. Ambargasta Ranges Argentina Epithermal deposits Manganese Sierras Pampeanas Analytical geochemistry Barite Calcite Carbonate minerals Iron ores Manganese Manganese compounds Mineralogy Minerals Ores Oxide minerals Oxides Quartz Silica Ambargasta Ranges Aqueous solutions Argentina Chemical compositions Concentration of Continental environments Cryptomelane Electron micro probes Epithermal deposits Epithermal systems Gangue minerals Hollandite Hydrothermal fluids Isotopic analysis Last stages Low salinities Manganese oxides Meteoric waters Mineralization process Ore minerals Shear systems Sierras Pampeanas X- ray diffractions Manganese deposits chemical composition electron probe analysis epithermal deposit fluid inclusion granodiorite hydrothermal fluid isotopic analysis manganese deposit mineralization ore mineral X-ray diffraction Argentina Cordoba [Argentina] Santiago del Estero [Argentina] Sierras Pampeanas South America The example of manganese mineralization studied in this paper makes up the major concentration of this element in Argentina. It comprises an area of 70 by 30 km in the eastern Sierras Pampeanas, located in Córdoba and Santiago del Estero provinces. It is quite unusual since it is hosted in granodioritic and rhyodacitic rocks. Geochemical, petrological and structural analyses demonstrate that these rocks are unrelated to the mineralization process. The geometry and distribution of the veins are controlled by a dextral shear system related to north-south lineaments. Textural and structural analyses of the veins indicate four different stages of mineralization. Ore minerals precipitated during the first three, whereas the gangue was mainly formed during the last stage. X-ray diffraction and electron-microprobe studies show that Mn4+ oxides (hollandite, pyrolusite, ramsdellite, romanèchite and cryptomelane) associated with Fe3+ oxides (goethite and hematite) are the main ore minerals. Calcite, opal, barite, and lesser amounts of fluorite, quartz and "chalcedony" are the most common gangue minerals. Fluid-inclusion studies show that this mineralization was associated with aqueous solutions of low salinity and a temperature of about 125°C. Isotopic analyses based on several samples of calcite (δ13C, δ18O) and barite (δ 34S, δ18O) have demonstrated the dominance of meteoric waters in the hydrothermal fluids. Finally, the chemical composition of manganese oxides supports the hypothesis of an epithermal system developed in continental environments. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00084476_v46_n5_p1215_Leal |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Ambargasta Ranges Argentina Epithermal deposits Manganese Sierras Pampeanas Analytical geochemistry Barite Calcite Carbonate minerals Iron ores Manganese Manganese compounds Mineralogy Minerals Ores Oxide minerals Oxides Quartz Silica Ambargasta Ranges Aqueous solutions Argentina Chemical compositions Concentration of Continental environments Cryptomelane Electron micro probes Epithermal deposits Epithermal systems Gangue minerals Hollandite Hydrothermal fluids Isotopic analysis Last stages Low salinities Manganese oxides Meteoric waters Mineralization process Ore minerals Shear systems Sierras Pampeanas X- ray diffractions Manganese deposits chemical composition electron probe analysis epithermal deposit fluid inclusion granodiorite hydrothermal fluid isotopic analysis manganese deposit mineralization ore mineral X-ray diffraction Argentina Cordoba [Argentina] Santiago del Estero [Argentina] Sierras Pampeanas South America |
| spellingShingle |
Ambargasta Ranges Argentina Epithermal deposits Manganese Sierras Pampeanas Analytical geochemistry Barite Calcite Carbonate minerals Iron ores Manganese Manganese compounds Mineralogy Minerals Ores Oxide minerals Oxides Quartz Silica Ambargasta Ranges Aqueous solutions Argentina Chemical compositions Concentration of Continental environments Cryptomelane Electron micro probes Epithermal deposits Epithermal systems Gangue minerals Hollandite Hydrothermal fluids Isotopic analysis Last stages Low salinities Manganese oxides Meteoric waters Mineralization process Ore minerals Shear systems Sierras Pampeanas X- ray diffractions Manganese deposits chemical composition electron probe analysis epithermal deposit fluid inclusion granodiorite hydrothermal fluid isotopic analysis manganese deposit mineralization ore mineral X-ray diffraction Argentina Cordoba [Argentina] Santiago del Estero [Argentina] Sierras Pampeanas South America Leal, P.R. Correa, M.J. Ametrano, S.J. Etcheverry, R.O. De Brodtkorb, M.K. The manganese deposits of the Pampean Ranges, Argentina |
| topic_facet |
Ambargasta Ranges Argentina Epithermal deposits Manganese Sierras Pampeanas Analytical geochemistry Barite Calcite Carbonate minerals Iron ores Manganese Manganese compounds Mineralogy Minerals Ores Oxide minerals Oxides Quartz Silica Ambargasta Ranges Aqueous solutions Argentina Chemical compositions Concentration of Continental environments Cryptomelane Electron micro probes Epithermal deposits Epithermal systems Gangue minerals Hollandite Hydrothermal fluids Isotopic analysis Last stages Low salinities Manganese oxides Meteoric waters Mineralization process Ore minerals Shear systems Sierras Pampeanas X- ray diffractions Manganese deposits chemical composition electron probe analysis epithermal deposit fluid inclusion granodiorite hydrothermal fluid isotopic analysis manganese deposit mineralization ore mineral X-ray diffraction Argentina Cordoba [Argentina] Santiago del Estero [Argentina] Sierras Pampeanas South America |
| description |
The example of manganese mineralization studied in this paper makes up the major concentration of this element in Argentina. It comprises an area of 70 by 30 km in the eastern Sierras Pampeanas, located in Córdoba and Santiago del Estero provinces. It is quite unusual since it is hosted in granodioritic and rhyodacitic rocks. Geochemical, petrological and structural analyses demonstrate that these rocks are unrelated to the mineralization process. The geometry and distribution of the veins are controlled by a dextral shear system related to north-south lineaments. Textural and structural analyses of the veins indicate four different stages of mineralization. Ore minerals precipitated during the first three, whereas the gangue was mainly formed during the last stage. X-ray diffraction and electron-microprobe studies show that Mn4+ oxides (hollandite, pyrolusite, ramsdellite, romanèchite and cryptomelane) associated with Fe3+ oxides (goethite and hematite) are the main ore minerals. Calcite, opal, barite, and lesser amounts of fluorite, quartz and "chalcedony" are the most common gangue minerals. Fluid-inclusion studies show that this mineralization was associated with aqueous solutions of low salinity and a temperature of about 125°C. Isotopic analyses based on several samples of calcite (δ13C, δ18O) and barite (δ 34S, δ18O) have demonstrated the dominance of meteoric waters in the hydrothermal fluids. Finally, the chemical composition of manganese oxides supports the hypothesis of an epithermal system developed in continental environments. |
| format |
JOUR |
| author |
Leal, P.R. Correa, M.J. Ametrano, S.J. Etcheverry, R.O. De Brodtkorb, M.K. |
| author_facet |
Leal, P.R. Correa, M.J. Ametrano, S.J. Etcheverry, R.O. De Brodtkorb, M.K. |
| author_sort |
Leal, P.R. |
| title |
The manganese deposits of the Pampean Ranges, Argentina |
| title_short |
The manganese deposits of the Pampean Ranges, Argentina |
| title_full |
The manganese deposits of the Pampean Ranges, Argentina |
| title_fullStr |
The manganese deposits of the Pampean Ranges, Argentina |
| title_full_unstemmed |
The manganese deposits of the Pampean Ranges, Argentina |
| title_sort |
manganese deposits of the pampean ranges, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_00084476_v46_n5_p1215_Leal |
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