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...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Sociedade Brasileira de Geologia
|
| Series: | Brazilian Journal of Geology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000300575&lng=en&tlng=en |
| _version_ | 1828542802504450048 |
|---|---|
| author | Caio José Soares Mesquita Roberto Dall’Agnol José de Arimatéia Costa de Almeida |
| author_facet | Caio José Soares Mesquita Roberto Dall’Agnol José de Arimatéia Costa de Almeida |
| author_sort | Caio José Soares Mesquita |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-12T02:02:28Z |
| format | Article |
| id | doaj.art-4ac8b7a6471742bf80e5b0548c782338 |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-12T02:02:28Z |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-4ac8b7a6471742bf80e5b0548c7823382022-12-22T00:42:07ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-469248357560110.1590/2317-4889201820170082S2317-48892018000300575Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, BrazilCaio José Soares MesquitaRoberto Dall’AgnolJosé de Arimatéia Costa de AlmeidaABSTRACT: 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000300575&lng=en&tlng=enmineral chemistrycrystallization parametersA-type graniteBannachPaleoproterozoicCarajás Province |
| spellingShingle | Caio José Soares Mesquita Roberto Dall’Agnol José de Arimatéia Costa de Almeida Mineral chemistry and crystallization parameters of the A-type Paleoproterozoic Bannach Granite, Carajás Province, Pará, Brazil Brazilian Journal of Geology mineral chemistry crystallization parameters A-type granite Bannach Paleoproterozoic Carajás Province |
| title | 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_short | 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 carajas province para brazil |
| topic | mineral chemistry crystallization parameters A-type granite Bannach Paleoproterozoic Carajás Province |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000300575&lng=en&tlng=en |
| work_keys_str_mv | AT caiojosesoaresmesquita mineralchemistryandcrystallizationparametersoftheatypepaleoproterozoicbannachgranitecarajasprovinceparabrazil AT robertodallagnol mineralchemistryandcrystallizationparametersoftheatypepaleoproterozoicbannachgranitecarajasprovinceparabrazil AT josedearimateiacostadealmeida mineralchemistryandcrystallizationparametersoftheatypepaleoproterozoicbannachgranitecarajasprovinceparabrazil |