First Occurrence of Ancylite in Bahia State: Accessory Mineral in the foid syenites of the Floresta Azul Alkaline Complex
Keywords:
Ancylite, foid syenite, Bahia State.Abstract
Microanalysis using energy dispersive spectrometer in the scanning electron microscope has made possible to identify ancylite [Sr (La, Ce) (CO3)2 (OH).(H2O)] in foid syenites of the Floresta Azul Alkaline Complex, located in the southern of Bahia State. The textures identified in the periphery of carbonate crystals and fractures in the annite crystals indicate that the crystallization of ancylite represents late stage in the evolution of these rocks.References
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2. Oleynikov OB, Suknev VS. Ancylite from kimberlites of Kuoykskoye Field Yakutia. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva, Proceedings of the Russian Mineralogical Society. 1999;128(5):96-99.
3. Mitchell RH, Chakmouradian AR. Instability of Perovskite in a CO2-Rich Environment: Examples from Carbonatito and Kimberlite. Journal of the Mineralogical Association of Canada. 1998;36(4):939-952.
4. Chakmouradian AR, Mitchell RH. The Mineralogy of Ba- and Zr-Rich Alkaline Pegmatites from GordonButte, Crazy Mountains (Montana, USA): Comparacions between Potassic and Sodic Agpaitic Pegmatites. Contrib. Mineral. Petrology. 2002;143:93-14.
5. Orlandini P, Pasero M, Vezzalini G. Calcio-ancylite-(Nd), a new REE-Carbonate from Baveno, Italy Eur. J. Mineral. 1990;2:413-418.
6. Pingitore N, Clague J, Gorski D. Round Top Mountain Rhyolite (Texas, USA), a Massive, Unique Y-bearing-fluorite-hosted Heavy Rare Earth Element (HREE) Deposit. Journal of Rare Earths. 2014;32:90-96.
7. Pomerancblum M. Carbonato Hidratado de Cério e Estrôncio – Ancilita: Primeira Ocorrência no Brasil. Anais do XXX Congresso Brasileiro de Geologia, Salvador-Bahia, SBG; 1978. 3:1156-1159.
8. Pereira VP, Conceição RV, Formoso MLL, Pires AC. Alteration of Perovskite to Anatase in Sílica-Undersaturated Rocks of the Catalão-I Carbonatite Complex, Brazil: A Raman study. Rev. Bras. Geociências. 2005;35(2):239-244.
9. Manfredi TR. A Mineralização de Parisita-(Ce) Associada ao Carbonatito Fazenda Varela (Correia Pinto, SC). Dissertação (mestrado). Porto Alegre: Universidade Federal do Rio Grande do Sul, 2013. 57p.
10. Rosa MLS, Conceição H, Menezes RCL, Macambira MJB, Galarza MA, Cunha MP, Menezes RCL, Marinho MM, Cruz Filho BE, Rios DC. Neoproterozóic Anarogenic Magmatism in the Southern Bahia alkaline Province of NE Brazil. Lithos. 2007;97:88-97.
11. Santos JJA. Petrografia da Intrusão Sienítica do Complexo Alcalino Floresta Azul, Sul do Estado da Bahia. Trabalho de Conclusão de Curso (graduação). São Cristóvão: Universidade Federal de Sergipe, 2013. 79p.
12. Pimenta ACS, Conceição H, Rosa MLS. Mineralogia das Vênulas Brancas e do Material Afanítico Preto em Planos de Fraturas em Sodalititos de Cor Azul do Stock Itajú do Colônia, Bahia. Scientia Plena. 2014;10(5):1-9.
13. Whitney D.L. & Evans B.W. Abbreviations for Names of Rock-Forming Minerals. American Mineralogist. 2010;95:185-187.
14. Mitchell RH. Accessory rare earth, strontium, barium and zirconium minerals in the Benfontein and Wesselton calcite kimberlites, South Afica. In Kimberlites, Related Rocks and Mantle Xenoliths (H.O.A. Mayer & O.H. Leonardos, eds.), Proc. 5th Intem. Kunb. Conf., Brasil, Companhia de Pesquisa de Recursos Minerais, Rio de Janeiro, 1995. 1:15-128.
15. Pekov IV, Petersen OV, Voloshin AV. Calcio-ancylite-(Ce) from Ilimaussaq and Naissârssuk, Greenland, Kola peninsula and Polar Urals, Russia; ancylite- (Ce) - calcio-ancylite-(Ce) an isomorphous series. Neues Jahrb. Mineral. Abh. 1997;171(3):309-322.
16. Zaitsev AN, Wall F, Le Bas MJ. REE-Sr-Ba Minerals from the Khibina Carbonatites, Kola Peninsda, Russia: Their Mineralogy, Paragenesis and Evolution. Mineralogical Magazine. 1998; 62(2):225-250.
17. Reguir EP & Mitchell RH. The Mineralogy of Carbonatites and Related Potassic Syenites from the Rocky Boy Stock, Bearpaw Mountains, north-central Montana. In: GeoCanada 2000 Conference CD (extended abstracts), 2000. File 374.pdf.
18. Reguir E. Aspects of the Mineralogy of the Murin Alkaline Complex, Yakutia, Russia. Dissertação (mestrado). Thunder Bay: Lakehead University, 2001. 193p.
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2014-10-12
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Santos, J. J. A., Rosa, M. L. S., & Conceição, H. (2014). First Occurrence of Ancylite in Bahia State: Accessory Mineral in the foid syenites of the Floresta Azul Alkaline Complex. Scientia Plena, 10(10). Retrieved from https://scientiaplena.org.br/sp/article/view/2103
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