The Encantada Granite: registration of a peraluminous intrusion in the Rondonian Province - San Ignacio, in SW Amazonic Craton, Mato Grosso, Brazil

Authors

  • Brena Verginassi do Nascimento Universidade Federal de Mato Grosso. Instituto de Ciências Exatas e da Terra. Programa de Pós-graduação em Geociências
  • Carlos Humberto da Silva Universidade Federal de Mato Grosso. Instituto de Ciências Exatas e da Terra. Departamento de Geologia Geral
  • Ana Cláudia Dantas da Costa Universidade Federal de Mato Grosso. Instituto de Ciências Exatas e da Terra. Departamento de Geologia Geral

DOI:

https://doi.org/10.11606/issn.2316-9095.v15i2p61-78

Keywords:

Peraluminous granite, Amazonic Craton, Rondonian Province - San Ignacio.

Abstract

The Encantada Granite occurs on the extreme southwest of the state of Mato Grosso, SW of the Amazonian Craton, near the border of Brasil/Bolívia. It corresponds to an body oriented to NNW direction that intruded metasedimentary and metavolcanic rocks. It consists of leucogranites with monzo- to sienogranitic composition, marked by prominent schistosity. It is characterized by equigranular to porphyritic inequigranular texture, and composed of quartz, K-feldspar, plagioclase, muscovite and biotite with garnet, zircon, allanite and opaque minerals. Chlorite and epidote are the most common secondary minerals. The geochemical study allows the classification of the magmatism as having acid character, sub-alkaline, high-potassium-calc-alkaline to shoshonitic type. These rocks have alumina index saturation higher than 1, with normative corundum, and thus classified as peraluminous granite. Due to the reflection of the excess of aluminium, they have various aluminous phases, mainly muscovite, biotite and garnet; presents typical pattern of calc-alkaline rocks rich in potassium with enrichment of light ETRs over the heavy ones. The collected data allows to consider that the Encantada Granite rocks were generated from the partial melting of crustal rocks of pelitic composition.

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Author Biographies

  • Brena Verginassi do Nascimento, Universidade Federal de Mato Grosso. Instituto de Ciências Exatas e da Terra. Programa de Pós-graduação em Geociências
    Programa de Pós-graduação em Geociências, Instituto de Ciências Exatas e da Terra, Universidade Federal de Mato Grosso - UFMT, Avenida Fernando Corrêa s/n, Bairro Coxipó, CEP 78060-900, Cuiabá, MT, BR
  • Carlos Humberto da Silva, Universidade Federal de Mato Grosso. Instituto de Ciências Exatas e da Terra. Departamento de Geologia Geral
    Departamento de Geologia Geral, Instituto de Ciências Exatas e da Terra, Universidade Federal de Mato Grosso - UFMT, Cuiabá, MT, BR
  • Ana Cláudia Dantas da Costa, Universidade Federal de Mato Grosso. Instituto de Ciências Exatas e da Terra. Departamento de Geologia Geral
    Departamento de Geologia Geral, Instituto de Ciências Exatas e da Terra, Universidade Federal de Mato Grosso - UFMT, Cuiabá, MT, BR

References

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Published

2015-06-30

Issue

Vol. 15 No. 2 (2015)

Section

Articles

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How to Cite

Nascimento, B. V. do, Silva, C. H. da, & Costa, A. C. D. da. (2015). The Encantada Granite: registration of a peraluminous intrusion in the Rondonian Province - San Ignacio, in SW Amazonic Craton, Mato Grosso, Brazil. Geologia USP. Série Científica, 15(2), 61-78. https://doi.org/10.11606/issn.2316-9095.v15i2p61-78