| Reference Type | Journal (article/letter/editorial) |
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| Title | Genesis and New Mineral Chemistry Data of Carlosbarbosaite, a Potential U and Nb Ore Source from Miarolitic-, A-Type Granites and NYF Pegmatites of the La Chinchilla Pluton, Velasco Ranges, La Rioja, Argentina |
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| Journal | The Canadian Journal of Mineralogy and Petrology |
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| Authors | Lira, Raúl | Author |
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| Parra, Francisco J. | Author |
| Biglia, Marco E. | Author |
| Morello, Orquídea | Author |
| Guereschi, Alina B. | Author |
| Year | 2023 (September 1) | Volume | 61 |
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| Page(s) | 927-964 | Issue | 5 |
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| Publisher | Mineralogical Association of Canada |
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| URL | |
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| DOI | doi:10.3749/2300008Search in ResearchGate |
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| Original Entry | Lira, R., Parra, F.J., Biglia, M.E., Morello, O., Guereschi, A.B. (2023): Genesis and New Mineral Chemistry Data of Carlosbarbosaite, a Potential U and Nb Ore Source from Miarolitic-, A-Type Granites and NYF Pegmatites of the La Chinchilla Pluton, Velasco Ranges, La Rioja, Argentina. The Canadian Journal of Mineralogy and Petrology, 61, (in press). |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16700271 | Long-form Identifier | mindat:1:5:16700271:2 |
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| GUID | 54eb12e2-8450-4d00-884f-52ac698ead65 |
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| Full Reference | Lira, Raúl, Parra, Francisco J., Biglia, Marco E., Morello, Orquídea, Guereschi, Alina B. (2023) Genesis and New Mineral Chemistry Data of Carlosbarbosaite, a Potential U and Nb Ore Source from Miarolitic-, A-Type Granites and NYF Pegmatites of the La Chinchilla Pluton, Velasco Ranges, La Rioja, Argentina. The Canadian Journal of Mineralogy and Petrology, 61 (5) 927-964 doi:10.3749/2300008 |
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| Plain Text | Lira, Raúl, Parra, Francisco J., Biglia, Marco E., Morello, Orquídea, Guereschi, Alina B. (2023) Genesis and New Mineral Chemistry Data of Carlosbarbosaite, a Potential U and Nb Ore Source from Miarolitic-, A-Type Granites and NYF Pegmatites of the La Chinchilla Pluton, Velasco Ranges, La Rioja, Argentina. The Canadian Journal of Mineralogy and Petrology, 61 (5) 927-964 doi:10.3749/2300008 |
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| In | (2023) The Canadian Journal of Mineralogy and Petrology Vol. 61 (5) Mineralogical Association of Canada |
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| Abstract/Notes | Abstract
The La Chinchilla granite is a ∼3.75 km2 epizonal pluton of Lower Carboniferous age located in Sierra de Velasco, Sierras Pampeanas, Argentina. Equigranular micropegmatitic and porphyritic main granite types host abundant millimeter- to <2 m-sized miarolitic pegmatites and pockets of simple major mineralogy (±beryl). Both granite types host micrometer-sized accessory species [i.e., monazite-(Ce), several high field strength element oxide species, ilmenite, cassiterite, fluorapatite] and fluorite. A F-Na-rich fluid phase promoted strong albitization at late-miarolitic stages, along with crystallization of extremely F-rich polylithionite and fluorite, and the formation of replacing pyrochlore group species associated with a second generation of cassiterite. The increase of the Ta# from hydroxycalciopyrochlore to hydroxycalciomicrolite and from micromiarolitic cassiterite (cassiterite 1) to hydrothermal cassiterite (cassiterite 2) supports Nb-Ta fractionation at hydrothermal temperatures. Carlosbarbosaite [(UO2)2Nb2O6(OH)2·2H2O] occurs as a pseudomorphic or short-range transported phase. Low-T, hydrothermal carlosbarbosaite formed after the replacement of columbite-(Fe), U-free Nb-bearing ilmenite, and likely after U-bearing pyrochlore supergroup species and a columbite group mineral, plausibly due to interaction with a hydrothermal, U6+(±Nb±Ta)-enriched fluid, in some cases a SiO2-bearing fluid. This fluid likely represents a lower T, less alkaline, and more oxidizing fluid that evolved from the higher T F-Na-rich fluids active during the late-miarolitic hydrothermal stage. Low-T, hydrothermal carlosbarbosaite has the ideal U-,Nb-rich endmember composition, though it is significantly richer in Ca and poorer in total Nb+Ta but with higher Nb# than that from the type locality. Supergene fluids deposited the transported type, which attained economic concentrations in a fault zone where restricted, likely alkaline oxidizing conditions could have favored Nb mobility. |
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