Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico)
Cu-Au skarn deposits of the mining district of Santa María de La Paz are located in the Sierra del Fraile, in the northern part of San Luis Potosí, Mexico. Samples of four different intrusions and their related skarn deposits were taken underground, in order to obtain whole-rock and mineral geochemi...
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todo:paper_01691368_v94_n_p310_Siesgesmund2023-10-03T15:07:00Z Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico) Siesgesmund, S. López-Doncel, R. Sieck, P. Wilke, H. Wemmer, K. Frei, D. Oriolo, S. Andradite-hedenbergite skarn Cu-Au mineralization Eocene Ore deposits Post-Laramide magmatism Re-Os geochronology Binary alloys Copper Copper alloys Copper compounds Deposits Garnets Geochemistry Geochronology Gold Gold alloys Gold deposits Lead alloys Mica Mineralogy Ore deposits Osmium alloys Pyrites Rhenium alloys Rocks Silicate minerals Zircon Crystallization age Environmental conditions Eocene Geochemical data Hedenbergite Hydrothermal deposits Magmatisms Reducing conditions Potassium compounds age determination andradite copper crystallization emplacement Eocene geochemistry geochronology gold hedenbergite hydrothermal deposit magmatism ore deposit petrogenesis skarn Mexico [North America] San Luis Potosi Sierra del Fraile Potos Cu-Au skarn deposits of the mining district of Santa María de La Paz are located in the Sierra del Fraile, in the northern part of San Luis Potosí, Mexico. Samples of four different intrusions and their related skarn deposits were taken underground, in order to obtain whole-rock and mineral geochemical data. U-Pb LA-ICP-MS zircon data indicate crystallization ages of ca. 37.6–35.0 Ma for skarn-related granitic and granodioritic stocks, which show dominant metaluminous to slightly peraluminous, high-K calc-alkaline compositions. These intrusions were emplaced in a post-Laramide continental arc setting under shallow conditions, as suggested by fast cooling inferred from K-Ar biotite ages of ca. 35–33 Ma. Skarn deposits were contemporaneous with emplacement and crystallization of stocks, as revealed by Re-Os molybdenite geochronological data of exoskarn rocks. Skarn rocks show a general depletion of LILE and REE and a slightly enrichment in HFSE in comparison with intrusive rocks. Pyroxene and garnet show dominant hedenbergite and andradite compositions, respectively. The association of hedenbergite, pyrite, chalcopyrite, native bismuth and pyrrhotite during skarn mineralization suggest reducing conditions, typical for Au but not for Cu skarns. Highest metal contents are concentrated in exoskarn rocks, including anomalies of Cu, Fe, Ni, Sn, Sb, Zn, W and Bi. Metal contents, ore minerals and environmental conditions of skarn rocks, together with whole-rock geochemical data of stocks and pyroxene-garnet compositions, reveal some singularities for the Sierra del Fraile deposits, as they exhibit characteristics of both Cu and Au skarn deposits but might be also compatible with Fe, W, and Zn skarns. Hence, skarn and associated vein deposits of the Sierra del Fraile might have a high potential not only for Cu-Au, but also for several base metals, as reported for comparable post-Laramide skarn and hydrothermal deposits of central and northern Mexico. © 2018 Elsevier B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01691368_v94_n_p310_Siesgesmund |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Andradite-hedenbergite skarn Cu-Au mineralization Eocene Ore deposits Post-Laramide magmatism Re-Os geochronology Binary alloys Copper Copper alloys Copper compounds Deposits Garnets Geochemistry Geochronology Gold Gold alloys Gold deposits Lead alloys Mica Mineralogy Ore deposits Osmium alloys Pyrites Rhenium alloys Rocks Silicate minerals Zircon Crystallization age Environmental conditions Eocene Geochemical data Hedenbergite Hydrothermal deposits Magmatisms Reducing conditions Potassium compounds age determination andradite copper crystallization emplacement Eocene geochemistry geochronology gold hedenbergite hydrothermal deposit magmatism ore deposit petrogenesis skarn Mexico [North America] San Luis Potosi Sierra del Fraile Potos |
| spellingShingle |
Andradite-hedenbergite skarn Cu-Au mineralization Eocene Ore deposits Post-Laramide magmatism Re-Os geochronology Binary alloys Copper Copper alloys Copper compounds Deposits Garnets Geochemistry Geochronology Gold Gold alloys Gold deposits Lead alloys Mica Mineralogy Ore deposits Osmium alloys Pyrites Rhenium alloys Rocks Silicate minerals Zircon Crystallization age Environmental conditions Eocene Geochemical data Hedenbergite Hydrothermal deposits Magmatisms Reducing conditions Potassium compounds age determination andradite copper crystallization emplacement Eocene geochemistry geochronology gold hedenbergite hydrothermal deposit magmatism ore deposit petrogenesis skarn Mexico [North America] San Luis Potosi Sierra del Fraile Potos Siesgesmund, S. López-Doncel, R. Sieck, P. Wilke, H. Wemmer, K. Frei, D. Oriolo, S. Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico) |
| topic_facet |
Andradite-hedenbergite skarn Cu-Au mineralization Eocene Ore deposits Post-Laramide magmatism Re-Os geochronology Binary alloys Copper Copper alloys Copper compounds Deposits Garnets Geochemistry Geochronology Gold Gold alloys Gold deposits Lead alloys Mica Mineralogy Ore deposits Osmium alloys Pyrites Rhenium alloys Rocks Silicate minerals Zircon Crystallization age Environmental conditions Eocene Geochemical data Hedenbergite Hydrothermal deposits Magmatisms Reducing conditions Potassium compounds age determination andradite copper crystallization emplacement Eocene geochemistry geochronology gold hedenbergite hydrothermal deposit magmatism ore deposit petrogenesis skarn Mexico [North America] San Luis Potosi Sierra del Fraile Potos |
| description |
Cu-Au skarn deposits of the mining district of Santa María de La Paz are located in the Sierra del Fraile, in the northern part of San Luis Potosí, Mexico. Samples of four different intrusions and their related skarn deposits were taken underground, in order to obtain whole-rock and mineral geochemical data. U-Pb LA-ICP-MS zircon data indicate crystallization ages of ca. 37.6–35.0 Ma for skarn-related granitic and granodioritic stocks, which show dominant metaluminous to slightly peraluminous, high-K calc-alkaline compositions. These intrusions were emplaced in a post-Laramide continental arc setting under shallow conditions, as suggested by fast cooling inferred from K-Ar biotite ages of ca. 35–33 Ma. Skarn deposits were contemporaneous with emplacement and crystallization of stocks, as revealed by Re-Os molybdenite geochronological data of exoskarn rocks. Skarn rocks show a general depletion of LILE and REE and a slightly enrichment in HFSE in comparison with intrusive rocks. Pyroxene and garnet show dominant hedenbergite and andradite compositions, respectively. The association of hedenbergite, pyrite, chalcopyrite, native bismuth and pyrrhotite during skarn mineralization suggest reducing conditions, typical for Au but not for Cu skarns. Highest metal contents are concentrated in exoskarn rocks, including anomalies of Cu, Fe, Ni, Sn, Sb, Zn, W and Bi. Metal contents, ore minerals and environmental conditions of skarn rocks, together with whole-rock geochemical data of stocks and pyroxene-garnet compositions, reveal some singularities for the Sierra del Fraile deposits, as they exhibit characteristics of both Cu and Au skarn deposits but might be also compatible with Fe, W, and Zn skarns. Hence, skarn and associated vein deposits of the Sierra del Fraile might have a high potential not only for Cu-Au, but also for several base metals, as reported for comparable post-Laramide skarn and hydrothermal deposits of central and northern Mexico. © 2018 Elsevier B.V. |
| format |
JOUR |
| author |
Siesgesmund, S. López-Doncel, R. Sieck, P. Wilke, H. Wemmer, K. Frei, D. Oriolo, S. |
| author_facet |
Siesgesmund, S. López-Doncel, R. Sieck, P. Wilke, H. Wemmer, K. Frei, D. Oriolo, S. |
| author_sort |
Siesgesmund, S. |
| title |
Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico) |
| title_short |
Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico) |
| title_full |
Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico) |
| title_fullStr |
Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico) |
| title_full_unstemmed |
Geochronological and geochemical constraints on the genesis of Cu-Au skarn deposits of the Santa María de la Paz district (Sierra del Fraile, Mexico) |
| title_sort |
geochronological and geochemical constraints on the genesis of cu-au skarn deposits of the santa maría de la paz district (sierra del fraile, mexico) |
| url |
http://hdl.handle.net/20.500.12110/paper_01691368_v94_n_p310_Siesgesmund |
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