Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, Argentina
Low-sulfidation epithermal base-metal sulfide-rich deposits, La Carolina gold-bearing district,San Luis, Argentina. La Carolina gold-bearing district is located at the western end of the Metallogenetic Belt of San Luis, which is spatially and genetically related to the mesosilicic volcanism of mio-p...
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| Format: | Article |
| Language: | Spanish |
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Instituto Superior de Correlación Geológica
2011-12-01
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| Series: | Serie Correlación Geológica |
| Subjects: | |
| Online Access: | http://www.insugeo.org.ar/libros/cg_28-1/07.htm |
| _version_ | 1818531284223262720 |
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| author | Gallard-Esquivel María Cecilia Urbina, Nilda Esther Sruoga, Patricia Japas, María Silvia |
| author_facet | Gallard-Esquivel María Cecilia Urbina, Nilda Esther Sruoga, Patricia Japas, María Silvia |
| author_sort | Gallard-Esquivel María Cecilia |
| collection | DOAJ |
| description | Low-sulfidation epithermal base-metal sulfide-rich deposits, La Carolina gold-bearing district,San Luis, Argentina. La Carolina gold-bearing district is located at the western end of the Metallogenetic Belt of San Luis, which is spatially and genetically related to the mesosilicic volcanism of mio-pliocene age. The volcanic arc experienced an eastward migration, due to the flattening of the Nazca plate in the segment 27°-33°S, known as the Pampean flat-slab. At La Carolina, the volcanic activity occurred between 8.2 and 6.3 Ma. It encompasses lavas and pyroclastics of andesitic, dacitic, latitic and trachytic composition. The mesosilicic magmas belong to normal to high-k calc-alkaline and shoshonitic suites. Structural analysis shows that previous structures have strongly controlled the emplacement of volcanic rocks and related mineral deposits at La Carolina allowing to define a pullapart.In this gold-bearing district there are eigth small mineralized prospects. The mineralogy consists of pyrite, arsenic rich pyrite, galena, sphalerite, marcasite, melnikovite, chalcopyrite, pyrrhotite, arsenopyrite, tennantitetetrahedrite, digenite, covellite, bornite, pyrargiryte, hessite, silvanite, pearceite, argirodite, gold, silver, greigite, boulangerite, jamesonite and electrum. The gangue consists of quartz, calcite, chalcedony and minor adularia.The hydrothermal alteration is widespread and comprise phyllic and argillic mineral assemblages characterized by sericite, illite, interstratified I/S, and silicic; propylitic alteration is also present as an outer halo. Fluid inclusions studies show that the formation temperatures range between 230º to 330º C. Boiling and mixing with meteoric water led to mineral precipitation. Based on the mineralogy, textures, hydrothermal alteration, formation temperatures,fluid chemistry and prospective geochemistry the mineralizations have been classified as low-sulfidation epithermal base-metal sulfide-rich deposits. |
| first_indexed | 2024-12-11T17:30:27Z |
| format | Article |
| id | doaj.art-398d9de3a29a4aa0ac8b55a029395f6f |
| institution | Directory Open Access Journal |
| issn | 1514-4186 1666-9479 |
| language | Spanish |
| last_indexed | 2024-12-11T17:30:27Z |
| publishDate | 2011-12-01 |
| publisher | Instituto Superior de Correlación Geológica |
| record_format | Article |
| series | Serie Correlación Geológica |
| spelling | doaj.art-398d9de3a29a4aa0ac8b55a029395f6f2022-12-22T00:56:50ZspaInstituto Superior de Correlación GeológicaSerie Correlación Geológica1514-41861666-94792011-12-0128I91102Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, ArgentinaGallard-Esquivel María CeciliaUrbina, Nilda EstherSruoga, PatriciaJapas, María SilviaLow-sulfidation epithermal base-metal sulfide-rich deposits, La Carolina gold-bearing district,San Luis, Argentina. La Carolina gold-bearing district is located at the western end of the Metallogenetic Belt of San Luis, which is spatially and genetically related to the mesosilicic volcanism of mio-pliocene age. The volcanic arc experienced an eastward migration, due to the flattening of the Nazca plate in the segment 27°-33°S, known as the Pampean flat-slab. At La Carolina, the volcanic activity occurred between 8.2 and 6.3 Ma. It encompasses lavas and pyroclastics of andesitic, dacitic, latitic and trachytic composition. The mesosilicic magmas belong to normal to high-k calc-alkaline and shoshonitic suites. Structural analysis shows that previous structures have strongly controlled the emplacement of volcanic rocks and related mineral deposits at La Carolina allowing to define a pullapart.In this gold-bearing district there are eigth small mineralized prospects. The mineralogy consists of pyrite, arsenic rich pyrite, galena, sphalerite, marcasite, melnikovite, chalcopyrite, pyrrhotite, arsenopyrite, tennantitetetrahedrite, digenite, covellite, bornite, pyrargiryte, hessite, silvanite, pearceite, argirodite, gold, silver, greigite, boulangerite, jamesonite and electrum. The gangue consists of quartz, calcite, chalcedony and minor adularia.The hydrothermal alteration is widespread and comprise phyllic and argillic mineral assemblages characterized by sericite, illite, interstratified I/S, and silicic; propylitic alteration is also present as an outer halo. Fluid inclusions studies show that the formation temperatures range between 230º to 330º C. Boiling and mixing with meteoric water led to mineral precipitation. Based on the mineralogy, textures, hydrothermal alteration, formation temperatures,fluid chemistry and prospective geochemistry the mineralizations have been classified as low-sulfidation epithermal base-metal sulfide-rich deposits.http://www.insugeo.org.ar/libros/cg_28-1/07.htmLow-sulfidation epithermal depositsPull apartLa Carolina gold-bearing districtSan LuisArgentina. |
| spellingShingle | Gallard-Esquivel María Cecilia Urbina, Nilda Esther Sruoga, Patricia Japas, María Silvia Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, Argentina Serie Correlación Geológica Low-sulfidation epithermal deposits Pull apart La Carolina gold-bearing district San Luis Argentina. |
| title | Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, Argentina |
| title_full | Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, Argentina |
| title_fullStr | Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, Argentina |
| title_full_unstemmed | Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, Argentina |
| title_short | Depósitos epitermales de baja sulfuración ricos en sulfuros de metales base, distrito aurífero La Carolina, San Luis, Argentina |
| title_sort | depositos epitermales de baja sulfuracion ricos en sulfuros de metales base distrito aurifero la carolina san luis argentina |
| topic | Low-sulfidation epithermal deposits Pull apart La Carolina gold-bearing district San Luis Argentina. |
| url | http://www.insugeo.org.ar/libros/cg_28-1/07.htm |
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