Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil
ABSTRACT: The A-type Paleoproterozoic Bannach Granite belongs to the Jamon Suíte and cross-cut the Archean units of the Rio Maria Domain in the Carajás Province. It comprises eight facies with varied mafic content and texture: even-grained cumulate granite (CG), even coarse-grained biotite-amphibole...
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ftjscielo:oai:scielo:S2317-48892018000300575 2023-05-15T16:12:09+02:00 Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil Mesquita,Caio José Soares Dall’Agnol,Roberto Almeida,José de Arimatéia Costa de 2018-07-01 text/html http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000300575 en eng Sociedade Brasileira de Geologia 10.1590/2317-4889201820170082 info:eu-repo/semantics/openAccess Brazilian Journal of Geology v.48 n.3 2018 mineral chemistry crystallization parameters A-type granite Bannach Paleoproterozoic Carajás Province info:eu-repo/semantics/article 2018 ftjscielo 2018-10-09T06:29:34Z ABSTRACT: The A-type Paleoproterozoic Bannach Granite belongs to the Jamon Suíte and cross-cut the Archean units of the Rio Maria Domain in the Carajás Province. It comprises eight facies with varied mafic content and texture: even-grained cumulate granite (CG), even coarse-grained biotite-amphibole monzogranite (cBAMz), even coarse-grained amphibole-biotite monzogranite (cABMz), porphyritic biotite monzogranite (pBMz), even coarse-grained leucomonzogranite (cLMz), early even medium-grained leucomonzogranite (EmLMz), late even medium-grained leucomonzogranite (LmLMz) and even fine-grained leucomonzogranite (fLMz). In the less evolved facies, the dominant amphibole is Fe-hornblende passing to Fe-edenite or hastingsite, with associated cummingtonite/grunerite originated from the destabilization of clinopyroxene. Biotite has ferroan composition and approaches annite in the late-emplaced leucomonzogranite. Plagioclase varies from andesine to oligoclase or from oligoclase to albite. Titanite, magnetite, and ilmenite are found in all granite facies showing magmatic origin. The near liquidus temperatures vary between 943ºC and 795ºC and the estimated emplacement pressure is 300 ± 50 MPa (~11.1 ± 1.9 km). Amphibole Fe/(Fe + Mg) ratios together with magmatic magnetite and titanite indicate that these granites crystallized at moderately oxidizing conditions, similar to those admitted for the Jamon granite and magnetite series granites of Laurentia. However, the composition of biotite suggests a more reduced character close to NNO to NNO -0.5. The late leucomonzogranite facies is an exception because it displays high Fe/(Fe + Mg) ratios in biotite and approaches to the reduced granites of Carajás, Laurentia and Fennoscandia in this regard. It derived from a more reduced source than the other facies of Bannach Granite. Article in Journal/Newspaper Fennoscandia SciELO Brazil (Scientific Electronic Library Online) |
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Open Polar |
collection |
SciELO Brazil (Scientific Electronic Library Online) |
op_collection_id |
ftjscielo |
language |
English |
topic |
mineral chemistry crystallization parameters A-type granite Bannach Paleoproterozoic Carajás Province |
spellingShingle |
mineral chemistry crystallization parameters A-type granite Bannach Paleoproterozoic Carajás Province Mesquita,Caio José Soares Dall’Agnol,Roberto Almeida,José de Arimatéia Costa de Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil |
topic_facet |
mineral chemistry crystallization parameters A-type granite Bannach Paleoproterozoic Carajás Province |
description |
ABSTRACT: The A-type Paleoproterozoic Bannach Granite belongs to the Jamon Suíte and cross-cut the Archean units of the Rio Maria Domain in the Carajás Province. It comprises eight facies with varied mafic content and texture: even-grained cumulate granite (CG), even coarse-grained biotite-amphibole monzogranite (cBAMz), even coarse-grained amphibole-biotite monzogranite (cABMz), porphyritic biotite monzogranite (pBMz), even coarse-grained leucomonzogranite (cLMz), early even medium-grained leucomonzogranite (EmLMz), late even medium-grained leucomonzogranite (LmLMz) and even fine-grained leucomonzogranite (fLMz). In the less evolved facies, the dominant amphibole is Fe-hornblende passing to Fe-edenite or hastingsite, with associated cummingtonite/grunerite originated from the destabilization of clinopyroxene. Biotite has ferroan composition and approaches annite in the late-emplaced leucomonzogranite. Plagioclase varies from andesine to oligoclase or from oligoclase to albite. Titanite, magnetite, and ilmenite are found in all granite facies showing magmatic origin. The near liquidus temperatures vary between 943ºC and 795ºC and the estimated emplacement pressure is 300 ± 50 MPa (~11.1 ± 1.9 km). Amphibole Fe/(Fe + Mg) ratios together with magmatic magnetite and titanite indicate that these granites crystallized at moderately oxidizing conditions, similar to those admitted for the Jamon granite and magnetite series granites of Laurentia. However, the composition of biotite suggests a more reduced character close to NNO to NNO -0.5. The late leucomonzogranite facies is an exception because it displays high Fe/(Fe + Mg) ratios in biotite and approaches to the reduced granites of Carajás, Laurentia and Fennoscandia in this regard. It derived from a more reduced source than the other facies of Bannach Granite. |
format |
Article in Journal/Newspaper |
author |
Mesquita,Caio José Soares Dall’Agnol,Roberto Almeida,José de Arimatéia Costa de |
author_facet |
Mesquita,Caio José Soares Dall’Agnol,Roberto Almeida,José de Arimatéia Costa de |
author_sort |
Mesquita,Caio José Soares |
title |
Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil |
title_short |
Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil |
title_full |
Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil |
title_fullStr |
Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil |
title_full_unstemmed |
Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil |
title_sort |
mineral chemistry and crystallization parameters of the a-type paleoproterozoic bannach granite, carajás province, pará, brazil |
publisher |
Sociedade Brasileira de Geologia |
publishDate |
2018 |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000300575 |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_source |
Brazilian Journal of Geology v.48 n.3 2018 |
op_relation |
10.1590/2317-4889201820170082 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1765997403795619840 |