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Conselheiro Pena pegmatite district, Minas Gerais, Brazil

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Latitude & Longitude (WGS84): 19° 10' 23'' South , 41° 28' 20'' West
Latitude & Longitude (decimal): -19.17333,-41.47250
GeoHash:G#: 7hddbm8eh
Locality type:District
Köppen climate type:Aw : Tropical savanna, wet


The Conselheiro Pena Pegmatite District lies 50-100 km southeast of Governador Valadares where it stretches about 110 km from SW to NE. The district includes more than 205 pegmatites that have been mined. Over 50 minerals have been found in the district, including much gem-quality tourmaline, aquamarine, morganite, and kunzite besides industrial materials such as K-feldspar, albite, mica, and beryl ore. Many of the pegmatites are rich in phosphates, including the primary triphylite and montebrasite, and more than a dozen secondary phosphates for which the district is best known, most notably brazilianite and variscite. The district is also known for red rubellite and multi-color elbaite including blue-caps. Today the Conselheiro Pena pegmatites are mined mostly for industrial feldspar (mainly microcline), plus minerals for collectors.

Tectonically, the Conselheiro Pena Pegmatite District lies within the Araçuaí Orogen, a structurally complex crustal segment created when two microcontinents collided during the Brasiliano Orogeny to form a portion of the southern supercontinent of Gondwana. Two-mica granites of the Urucum suite were generated during that orogeny at ca. 582 Ma, and pegmatites evolved by fractional crystallization from those. Most pegmatite bodies in the district are tabular or lenticular, but a few are tear-drop shaped. The pegmatites solidified at a temperature of about 600 degrees C and under pressures of 4-5 kbar, corresponding to depths of 12-15 km (Nalini et al., 2015). They intruded mostly along steeply-dipping strike-slip shear zones in the metamorphics of the Rio Doce Group. These rocks include sillimanite-staurolite-garnet-mica schist with interbedded marble, metawackes, and metaquartzites that were originally marine sedimentary rocks deposited in a narrow seaway that once separated the two colliding microcontinents.

NK, rev. December 2017


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15 valid minerals.

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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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Correia Neves, J. M., Pedrosa-Soares, A. C., Marciano, V. R. P. da R. O., 1986, A provincia pegmatitica oriental do Brasil à luz dos conhecimentos atuais: Revista Brasileira Geociencias., v. 16, p. 106-118.
Nalini, H. A., Jr., Machado, R., Bilal, E., 2015, Petrogenesis and tectonics of the Urucum granitic suite, Rio Doce Valley (Minas Gerais - Brazil): an example of syn to late collisional peraluminous magmatism associated with high-angle transcurrent shear zone: Brazilian Jour. Geol., v. 45, no. 1. (http://dx.doi.org/10.1590/23174889201500010009.)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 842.
Pedrosa-Soares, A., Chaves, M., and Scholz, R., 2009, Eastern Brazilian Pegmatite Province: 4th Internat. Symposium on Granitic Pegmatites, Field Trip Guide, p. 1-28. (http://www.researchgate.net/publication/234037120_Eastern_Brazilian_Pegmatite_Province.)
Robinson, G. W. & King, V. T. (1993): What's new in minerals? Annual world summary of mineral discoveries covering April 1992 through April 1993. Brazil. Mineralogical Record 24: 384-385
Scholz, R; et al. (2012): The secondary phosphate minerals from Conselheiro Pena Pegmatite District (Minas Gerais, Brazil): substitutions of triphylite and montebrasite. Para conhecer a Terra: memórias e notícias de Geociências no espaço lusófono. presented at the 2012. Coimbra, 2012.

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