Abstract
New evidence supported by petrography (including mineral chemistry), lithogeochemistry, U-Pb geochronology by Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS), and physicochemical study of fluid and melt inclusions by LA-ICP-MS and microthermometry, point to an orogenic setting of Lagoa Real (Bahia-Brazil) involving uraniferous mineralization. Unlike the previous models in which uraniferous albitites represent Na-metasomatised 1.75 Ga anorogenic granitic rocks, it is understood here that they correspond to metamorphosed sodium-rich and quartz-free 1.9 Ga late-orogenic syenitic rocks (Na-metasyenites). These syenitic rocks are rich not only in albite, but also in U-rich titanite (source of uranium). The interpretation of geochemical data points to a petrogenetic connection between alkali-diorite (local amphibolite protolith) and sodic syenite by fractional crystallization through a transalkaline series. This magmatic differentiation occurred either before or during shear processes, which in turn led to albitite and amphibolite formation. The metamorphic reactions, which include intense recrystallization of magmatic minerals, led uraninite to precipitate at 1.87 Ga under Oxidation/Reduction control. A second population of uraninites was also generated by the reactivation of shear zones during the 0.6 Ga Brasiliano Orogeny. The geotectonic implications include the importance of the Orosirian event in the Paramirim Block during paleoproterozoic Săo Francisco Craton edification and the influence of the Brasiliano event in the Paramirim Block during the West-Gondwana assembly processes. The regional microcline-gneiss, whose protolith is a 2.0 Ga syn-collisional potassic granite, represents the albitite host rock. The microcilne-gneiss has no petrogenetic association to the syenite (albitite protolith) in magmatic evolutionary terms.
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References
Costa P.H.O., Andrade A.R.F., Lopes G.A., Souza S.L.. Projeto Lagoa Real: Mapeamento Geológico, 1:25.000. Salvador: CBPM, 1985
CPRM. Catálogo geral de produtos e serviços. Geologia. Levantamentos Aerogeofísicos. Base de dados Aerogeofísicos, Rio de Janeiro, Geologia e Recursos Hídricos, 1995
Garrido I.A.A., Silva R.W.S., Mascarenhas J.F., Interpretaçao integrada de dados magnéticos e gamaespectrométricos — Área Ibitiara-Rio das Contas, Bahia Brasil [Integrated interpretation of gammaspectrometric and magnetic data — Ibitiara-Rio das Contas Area, Bahia — Brazil]. Programa de Levantamentos Aerogeofísicos — CBPM. 2002
Geisel Sobrinho E., Apresentaçao de uma hipótese genética para o Distrito Uranífero de Lagoa Real [Presentation of a genetic hypothesis for the Uraniferous District of Lagoa Real]. Nota Técnica EBHO.PM No. 3, Nuclebrás, 1981
Alves J.V., Fuzikawa K., O estudo de inclusoes fluidas da jazida uranífera de Cachoeira-Caetité, BA: resultados preliminares [The study of fluid inclusions of the Cachoeira Uraniferous deposit — CaetitÃl, BA:preliminary results]. In: Anais do Congresso Brasileiro de Geologia, 33, Rio de Janeiro. Sociedade Brasileira de Geologia, V.3, 1984, 1503–1517.
Oliveira A.G., Fuzikawa K., Moura L.A.M., Raposo C., Província uranífera de Lagoa Real — BA [Lagoa Real Uraniferous Province], Principais Depósitos Minerais do Brasil — DNPM (National Department of Mineral Production) 5, 1985, 105–120.
Turpin L., Maruejol P., Cuney M., U-Pb, Rb-Sr and Sm-Nd chronology of granitic basement, hydrotermal albitites and uranium mineralization (Lagoa Real, South-Bahia, Brazil). Contributions to Mineralogy and Petrology, 98, 1988,139–147
Maruejol P., Métasomatose alcaline et minéralisations uranifcres: les albitites du gisement de Lagoa Real (Bahia, Brésil) et exemples complémentaires de Xihuashan (SE Chine), Zheltorechensk (Ukraine) et Chhuling Khola (Népal central) [Alkaline metasomatism and uraniferous mineralization: albitites of the Lagoa Real (Bahia, Brazil) and additional examples Xihuashan (SE China) Zheltorechensk (Ukraine) and Chhuling Khola (Central Nepal)]. These Docteur. — Centre de Recherches sur la Géologie de l’Uranium, Nancy, France, 1989
Lobato L.M., Fyfe W.S., Metamorphism, Metasomatism, and Mineralization at Lagoa Real, Bahia, Brazil. Economic Geology, 85, 1990, 968–989
Pimentel M.M., Machado N., Lobato L.M., Geocronologia U-Pb de rochas graníticas e gnáissicas da regiao de Lagoa Real (BA) e implicaçoes para a idade da mineralizaçao de Urânio [U-Pb geochronology of granitic and gneissic rocks of the Lagoa Real (BA) region and implications for the age of uranium mineralization]. Anais do XXXVIII Congresso Brasileiro de Geologia, Camboriú, 1994, 389–390
Pascolathi E.M., Silva C.L., Costa S.S., Osako L.S., Amaral G., Rodriguez I.P., Novas ocorrencias de urânio na regiao de Lagoa Real, a partir da superposiçao de dados geofísicos, geológicos e de sensoriamento remoto [New occurrences of uranium in the region of Lagoa Real from the superimposition of geophysical, geological and remote sensing data]. Revista Brasileira Geociencias, 33, 2003, 91–98
Cruz S.C.P., A interaçao entre o Aulacógeno do Paramirim e o Orógeno Araçuaí-Oeste Congo [The interaction between Paramirim aulacogen and the Araçuaí-West Congo Orogen]. Tese Doutorado-UFOP, Contribuiçoes rs Ciencia da Terra — Série D, 2004
Cordani U.G., Iyer S.S., Taylor K., Kawashita K., Sato K., McReath I., Pb-Pb, Rb-Sr, and K-Ar systematics of the Lagoa Real uranium province (southcentral Bahia, Brazil) and the Espinhaço Cycle (ca. 1.5-1.0 Ga). Journal of South American Earth Sciences, 5, 1992, 33–46
Plant J.A., Simpson P.R., Smith B., Windley B., Uranium ore deposits — products of the radioactive Earth. In: Burns, P.C. and Finch, R. (Eds.) — Uranium: Mineralogy, Geochemistry and the Environment. Reviews in Mineralogy, 33, 1999, 255–307
Bonin B., From orogenic to anorogenic magmatism: a petrological model for the transition calc-alkaline — alkaline complexes. Revista Brasileira Geociencias, 17, 1987, 366–371
Keppler H., Constraints from partitioning experiments on the composition of subduction-zone fluids. Nature, 380, 1996, 237–240
Inda H.V.A., Barbosa J.S.F., Texto explicativo para o mapa geológico do Estado da Bahia (1:1.000.000). In: J.S.L. Barbosa, Dominguez J.M.S., Geologia da Bahia (texto explicativo). Salvador, Secretaria da Industria, Comércio e Mineraçao, Superintendencia de Geologia e Recursos Minerais, 1996
Mascarenhas J.F., A geologia do centro-leste do Estado da Bahia [The geology of central-east of the Bahia State]. In: Anais do XXVII Congresso Brasileiro de Geologia, Aracaju, 1973, 2, 35–66
Almeida F.F., O Cráton do Sao Francisco. Revista Brasileira Geociencias, 7, 1977, 349–364
Cordani U.G., Brito Neves B.B., The geologic evolution of South America during the Archaean and Early Proterozoic. Revista Brasileira Geociencias, 12, 1982, 78–88
Caby R., Arthaud M., Petrostructural evolution of the Lagoa Real subalkaline metaplutonic complex (Bahia, Brazil). Revista Brasileira Geociencias, 17, 1987, 636
Ribeiro C. I., Carvalho Filho C. A., Hashizume S., As jazidas de urânio de Lagoa Real [The uranium deposits of Lagoa Real]. Anais do XXXIII Congresso Brasileiro de Geologia, 1984, 1463–1474
Sylvester P., Laser Ablation-ICP-MS — Principles and Applications. Short Courses Series, 29, Mineralogical Association of Canada, 2001
Stacey J.S., Kramers J.D., Approximation of terrestrial lead isotope evolution by a two-stage model. Earth and Planetary Science Letters, 26, 1975, 207–221
Ludwig K.R., Isoplot/Ex 3.00: A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center, Special Publication, 2003, 4
Gregory M.J., Wilde A.R., Jones P., Uranium deposits of the Mount Isa region and their relationship to deformation, metamorphism and Cu deposition. Economic Geology, 100, 2005, 537–546
Yardley B.W.D., Introduçao r Petrologia Metamórfica. EDUNB (translated edition). 1989
Finch R., Murakami T., Systematics and Paragenesis of uranium minerals. In: Burns P.C., Finch R.J. (Eds), Uranium: Mineralogy, Geochemistry and the Environment. Reviews in Mineralogy. Mineralogical Society of America, 38, 1999, 91–166
Kojima S., Takeda S., Kogita S., Chemical factors controlling the solubility of uraninite and their significance in the genesis of unconformity-related uranium deposits. Mineralium Deposita, 29, 1994, 353–360
Rafalskii R.P., Kudunova K.F., Experimental investigation of the conditions of the reduction and precipitation of uranium by minerals. Atomic Energy, 1961, 7, 815–818.
Pickhardt C., Dietze HJ., Becker J.S., Laser Ablation Inductively Coupled Plasma Mass Spectrometry for direct isotope ratio measurements on solid samples. International Journal of Mass Spectrometry, 242, 2005, 273–280
Guimaraes J.T., Teixeira L.R., Silva M.G., Martins A.A.M, Filho E.L.A., Loureiro H.S.C., Arcanjo J.B., Dalton de Souza J., Neves J.P., Mascarenhas J.F., Melo R.C., Bento R.V., Dataçoes U-Pb em rochas magmáticas intrusivas no Complexo Paramirim e no Rifte Espinhaço: uma contribuiçao ao estudo da evoluçao geocronológica da Chapada Diamantina [U-Pb dating on magmatic intrusive rocks of the Paramirim complex and Espinhaço rift: a contribution to the study of the geochronological evolution of the Chapada Diamantina]. In: Anais do III Simpósio do Cráton Sao Francisco. Salvador, Bahia, 2005
Alkmin F.F., Marshak S., Transamazonian orogeny in the southern Sao Francisco Craton region (MG), Brazil: Evidence for Palaeoproterozoic collision and collapse in the Quadrilátero Ferrífero. Precambrian Research, 90, 1998, 29–58
Heinrich C.A., Pettke T., Halter W.E., Aigner-Torres M., Audetat A., Gunther D., Hattendorf B., Bleiner D., Guillong M., Horn I., Quantitative multi-element analysis of minerals, fluid and melt inclusions by Laser Ablation Inductively Coupled Plasma Mass Spectrometry. Geochimica Cosmochimica Acta, 67, 2003, 3473–3496
Richard L.R.. Minpet version 2.02 — Mineralogical and petrological data processing system for Windows., Quebec — Canada, 1996
Pearce T.H., A contribution to the theory of variation diagrams. Contributions to Mineralogy and Petrolology, 19, 1968, 142–157
Le Bas M.J., Le Maitre R.W., Streckeisen A. Zanettin B., A chemical classification of volcanic rocks based on the total alkali — silica diagram. Journal of Petrology, 27, 1986, 745–750
Whitney D.L., Evans B.W., Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 2009, 185–187
Middlemost E.A.K., Towards a comprehensive classification of igneous rocks and magmas. Earth Science Reviews, 31, 1991, 73–87
Le Maitre R.W., Igneous Rocks — A classification and Glossary of Terms. Recommendations of the International Union of Geological Sciences, Subcommission of the Systematics of Igneous Rocks. Cambridge University Press, Cambridge, 2002
Irvine T. N., Baragar W.R.A., A guide to the chemical classification of the common volcanic rocks. Canadian Journal Earth Sciences, 8, 1971, 523–548
Batchelor R. A., Bowden P., Petrogenetic interpretation of granitoid rock series using multicationic parameters. Chemical Geology, 48, 1985, 43–65
CPRM/CBPM. Geologia e Recursos Minerais do Estado da Bahia — Sistema de Informaçoes Geográficas, 2003, CD-ROM
Bonin B. Do coeval mafic and felsic magmas in postcollisional to within-plate regimes necessarily imply two contrasting, mantle and crustal, sources? A review. Lithos, 78, 2004, 1–24
Deer W.A., Howie R.A., Zussman J., An introduction to the rock forming minerals. Longman Group Ltd., London, 1966
Hawthorne F.C, Oberti R., On the classification of amphiboles. Canadian Mineralogist, 44, 2006, 1–21
Nesbitt H.W., Young G.M., Early Proterozoic climates and plate motions inferred from major element chemistry of lutites. Nature, 299, 1982, 715–717
Garcia L.R.A., Introduçao r Microscopia Eletrônica de Varredura e r Microanálise. Centro de Desenvolvimento da Tecnologia Nuclear — CDTN [Introduction to Scanning Electron Microscopy and Microanalysis]. Belo Horizonte, 2001
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de Oliveira Chaves, A. New geological model of the Lagoa Real uraniferous albitites from Bahia (Brazil). cent.eur.j.geo. 5, 354–373 (2013). https://doi.org/10.2478/s13533-012-0134-7
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DOI: https://doi.org/10.2478/s13533-012-0134-7