Chemistry:Caldasite
From HandWiki
| Composition | |
|---|---|
| Primary | Zircon (ZrSiO4), Baddeleyite (ZrO2) |
| Secondary | Uranium (as triuranium octoxide [U2O3]) |
Caldasite (Portuguese: Caldasito, German: Zirkonglaskopf, Spanish: Caldasita)[1] is a rare uraniferous ore of zirconium found in the Poços de Caldas massif, located in the states of Minas Gerais and São Paulo, Brazil .
It is most often found as a dark gray, very dense, hard rock. It also appears as a friable brown substance.[2]
The massif is an alkaline complex, formed by a large intrusion during the mid-Cretaceous. The ore is a result of hydrothermal alteration of the nepheline-syenitic rocks; it has also been weathered out and concentrated in paleoplacer deposits.
References
- ↑ 1.0 1.1 Caldasite, MinDat.org, http://www.mindat.org/show.php?id=4714, retrieved January 30, 2016
- ↑ Gonçalves, J.R.; Lakschevitz Jr., A. (August 1973) (in pt). Study of the mineral characteristics of caldasite. International Nuclear Information System. INIS-MF--1563. https://inis.iaea.org/search/search.aspx?orig_q=RN:5154997. Retrieved 8 February 2016.
Further reading
- Brown, A.E.P. (1972). Aproveitamento do Zircônio e do Urânio de um Mineral Complexo de ZrSiO4 e ZrO2 (Caldasito), da Região de Poços de Caldas, Estado de Minas Gerais, Brasil [Reclaiming Zirconium and Uranium from a ZrSiO4–ZrO2 Compound Mineral (Caldasite), Poços de Caldas Region, Minas Gerais, Brazil] (PDF) (Master's) (in português). São Paulo Polytechnic University. Retrieved January 27, 2016.
- Brown, A.E.P.; Costa, E.C. (1972). Processing of a uraniferous zirconium ore. 4073530. https://inis.iaea.org/search/search.aspx?orig_q=RN:4073530.
- Curtius, A.J. (1975). "Radioactive disequilibria in Brazilian caldasite". Inorganic and Nuclear Chemistry Letters 11 (12): 841–845. doi:10.1016/0020-1650(75)80111-5. ISSN 0020-1650. https://inis.iaea.org/search/search.aspx?orig_q=RN:7223435. Retrieved January 27, 2016.
- Derby, O.A. (January 1887). "On Nepheline-Rocks in Brazil, with Special Reference to the Association of Phonolite and Foyaite". Quarterly Journal of the Geological Society (London) 43 (1–4): 457–473. doi:10.1144/GSL.JGS.1887.043.01-04.35. http://jgslegacy.lyellcollection.org/content/43/1-4/457.abstract. Retrieved January 28, 2016.
- Forman, J.M.A.; Angeiras, A.G. (26–29 November 1979). "Poços de Caldas and Itataia: two case histories of uranium exploration in Brazil". Advisory Group Meeting. Vienna: International Atomic Energy Agency. pp. 99–139. IAEA-AG-250/14. ISBN 92-0-141081-6. http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/13/647/13647574.pdf. Retrieved 2016-01-28.
- Franco, R.R.; Loewenstein, W. (1948). "Zirconium from the region of Poços de Caldas". American Mineralogist 33 (3–4): 142–151. http://www.minsocam.org/ammin/AM33/AM33_142.pdf. Retrieved January 27, 2016.
- Laznicka, P. (1985). Empirical Metallogeny, Depositional Environments, Lithologic Associations and Metallic Ores. Phanerozoic Environments, Associations and Deposits. Elsevier. p. 1531. ISBN 978-0-444-59756-4. https://books.google.com/books?id=W7hP_ef5QkwC&pg=PA1531. Retrieved 28 January 2016.
- Takenaka, L.B.; Lana, C.; Scholz, R.; Nalini Jr., H.A.; de Abreu, A.T. (October 2015). "Optimization of the in-situ U–Pb age dating method via LA-Quadrupole-ICP-MS with applications to the timing of U–Zr–Mo mineralization in the Poços de Caldas Alkaline Complex, SE Brazil". Journal of South American Earth Sciences 62: 70–79. doi:10.1016/j.jsames.2015.04.007. http://www.repositorio.ufop.br/handle/123456789/6070.
- Tolbert, G.E. (1966). The Uraniferous Zirconium Deposits of the Poços de Caldas Plateau, Brazil. USGS Bulletin. doi:10.3133/b1185C. 1185-C. https://pubs.er.usgs.gov/publication/b1185C. Retrieved 30 January 2016.
- Ulbrich, H.H.G.J. (1984). A Petrografia, a Estrutura e o Quimismo de Nefelina Sienitos do Maciço Alcalino de Poços de Caldas MG-SP [Petrography, Structure and Chemistry of the Nepheline Syenite Poços de Caldas Alkaline Massif] (Habilitation) (in português). Instituto de Geociências, University of São Paulo. Retrieved 2016-01-28.
- Ulbrich, H.H.G.J.; Vlach, S.R.F.; Ulbrich, M.N.C.; Kawashita, K. (March 2002). "Penecontemporaneous syenitic-phonolitic and basic-ultrabasic- carbonatitic rocks at the Poços de Caldas alkaline massif, SE Brazil: Geologic and geochronologic evidence". Revista Brasileira de Geociências (Now Brazilian Journal of Geology) 32 (1): 15–26. ISSN 2317-4692. http://rbg.sbgeo.org.br/index.php/rbg/article/viewFile/957/649. Retrieved 8 February 2016.
- Ulbrich, H.H.G.J.; Vlach, S.R.F.; Demaiffe, D.; Ulbrich, M.N.C. (2005). "Structure and origin of the Poços de Caldas Alkaline Massif, SE Brazil". Mesozoic to Cenozoic Alkaline Magmatism in the Brazilian Platform. São Paulo: Edusp/Fapesp. pp. 367–418. ISBN 978-85-314-0903-5. https://books.google.com/books?id=9dbX6WKPsvsC&pg=PA367. Retrieved 2016-01-30.
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