Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil
The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
de Oliveira, Vinícius Eduardo Silva [verfasserIn] de Oliveira, Davis Carvalho [verfasserIn] Marangoanha, Bhrenno [verfasserIn] Lamarão, Cláudio Nery [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Journal of South American earth sciences - Amsterdam [u.a.] : Elsevier Science, 1988, 85, Seite 135-159 |
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| Übergeordnetes Werk: |
volume:85 ; pages:135-159 |
| DOI / URN: |
10.1016/j.jsames.2018.04.022 |
|---|
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ELV000128651 |
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| 245 | 1 | 0 | |a Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil |
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| 520 | |a The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. | ||
| 650 | 4 | |a Petrography | |
| 650 | 4 | |a Mineral chemistry | |
| 650 | 4 | |a A-type granites | |
| 650 | 4 | |a Neoarchean | |
| 650 | 4 | |a Carajás | |
| 700 | 1 | |a de Oliveira, Davis Carvalho |e verfasserin |4 aut | |
| 700 | 1 | |a Marangoanha, Bhrenno |e verfasserin |4 aut | |
| 700 | 1 | |a Lamarão, Cláudio Nery |e verfasserin |4 aut | |
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10.1016/j.jsames.2018.04.022 doi (DE-627)ELV000128651 (ELSEVIER)S0895-9811(18)30003-8 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl de Oliveira, Vinícius Eduardo Silva verfasserin aut Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. Petrography Mineral chemistry A-type granites Neoarchean Carajás de Oliveira, Davis Carvalho verfasserin aut Marangoanha, Bhrenno verfasserin aut Lamarão, Cláudio Nery verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 85, Seite 135-159 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:85 pages:135-159 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 85 135-159 |
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10.1016/j.jsames.2018.04.022 doi (DE-627)ELV000128651 (ELSEVIER)S0895-9811(18)30003-8 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl de Oliveira, Vinícius Eduardo Silva verfasserin aut Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. Petrography Mineral chemistry A-type granites Neoarchean Carajás de Oliveira, Davis Carvalho verfasserin aut Marangoanha, Bhrenno verfasserin aut Lamarão, Cláudio Nery verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 85, Seite 135-159 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:85 pages:135-159 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 85 135-159 |
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10.1016/j.jsames.2018.04.022 doi (DE-627)ELV000128651 (ELSEVIER)S0895-9811(18)30003-8 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl de Oliveira, Vinícius Eduardo Silva verfasserin aut Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. Petrography Mineral chemistry A-type granites Neoarchean Carajás de Oliveira, Davis Carvalho verfasserin aut Marangoanha, Bhrenno verfasserin aut Lamarão, Cláudio Nery verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 85, Seite 135-159 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:85 pages:135-159 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 85 135-159 |
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10.1016/j.jsames.2018.04.022 doi (DE-627)ELV000128651 (ELSEVIER)S0895-9811(18)30003-8 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl de Oliveira, Vinícius Eduardo Silva verfasserin aut Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. Petrography Mineral chemistry A-type granites Neoarchean Carajás de Oliveira, Davis Carvalho verfasserin aut Marangoanha, Bhrenno verfasserin aut Lamarão, Cláudio Nery verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 85, Seite 135-159 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:85 pages:135-159 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 85 135-159 |
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10.1016/j.jsames.2018.04.022 doi (DE-627)ELV000128651 (ELSEVIER)S0895-9811(18)30003-8 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl de Oliveira, Vinícius Eduardo Silva verfasserin aut Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. Petrography Mineral chemistry A-type granites Neoarchean Carajás de Oliveira, Davis Carvalho verfasserin aut Marangoanha, Bhrenno verfasserin aut Lamarão, Cláudio Nery verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 85, Seite 135-159 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:85 pages:135-159 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 85 135-159 |
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Enthalten in Journal of South American earth sciences 85, Seite 135-159 volume:85 pages:135-159 |
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Petrography Mineral chemistry A-type granites Neoarchean Carajás |
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de Oliveira, Vinícius Eduardo Silva @@aut@@ de Oliveira, Davis Carvalho @@aut@@ Marangoanha, Bhrenno @@aut@@ Lamarão, Cláudio Nery @@aut@@ |
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de Oliveira, Vinícius Eduardo Silva ddc 550 bkl 38.00 bkl 38.70 bkl 38.55 misc Petrography misc Mineral chemistry misc A-type granites misc Neoarchean misc Carajás Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil |
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550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil Petrography Mineral chemistry A-type granites Neoarchean Carajás |
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Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil |
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de Oliveira, Vinícius Eduardo Silva |
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geology, mineralogy and petrological affinities of the neoarchean granitoids from the central portion of the canaã dos carajás domain, amazonian craton, brazil |
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Geology, mineralogy and petrological affinities of the Neoarchean granitoids from the central portion of the Canaã dos Carajás domain, Amazonian craton, Brazil |
| abstract |
The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. |
| abstractGer |
The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. |
| abstract_unstemmed |
The central portion of the Canaã dos Carajás domain, located in the northern part of the Carajás province was originally marked by the occurrence of undifferentiated rocks belonging to the Xingu complex and Plaque suite, as well as greenstone belts, mafic rocks of the Pium diopside-norite and high K calc-alkaline leucogranites (Boa Sorte and Cruzadão granites). A semi-detailed geological mapping (1:100.000) was carried out in the Vila União area and allowed the identification of several deformed granite bodies intrusive in the Mesoarchean units. They correspond to the most expressive unit of the studied area and are composed predominantly of monzogranites with chemical and mineralogical affinity with the Neoarchean A-type granites of the Planalto and Vila Jussara suites. The variable felsic and ferromagnesian minerals contents, as well as the different proportions between them, allowed to distinguish four major groups of granitoids: (i) biotite-hornblende monzogranites (BtHblMzG); (ii) biotite granites and leucogranites (BtLG); (iii) biotite-hornblende tonalites (BtHblTn); and (iv) quartz diorites (QD). The tectonic foliation of these rocks follows the regional E-W trend and exhibits high angles (70–85°). Well-developed core and mantle structures in quartz and feldspar crystals, as well as the presence of serrated and irregular contacts between these crystals suggest that dynamic recrystallization occurred at relatively high temperatures (>500 °C). These rocks exhibit a wide variation in silica content (57.20–75.91 wt%), are metaluminous to slightly peraluminous and show affinity with A-type (high HFSE) and ferroan granites. Based on magnetic petrology studies it was possible to distinguish two groups of rocks: (1) granites containing only ilmenite with low magnetic susceptibility values (MS; <0.570 × 10−3 SI), and (2) granites with magnetite as the main iron and titanium oxide mineral and higher MS values (>1.437 × 10−3 SI). Textural and compositional evidences indicate that magnetite and ilmenite are early-crystallized phases and titanite has magmatic origin. Amphiboles are calcic and classified as hastingsite, whereas biotites are magnesian to ferroan. The relatively high Fe/(Fe + Mg) ratios found in the amphiboles of the BtHblMzG and BtHblTn varieties indicate that these granitoids were formed under low to moderate fO2 conditions, whereas in the BtLG the lower values of this ratio suggest more oxidizing conditions. Geothermometers point to crystallization temperatures between 830 and 930 °C in the different facies. The high total Al content in the amphibole crystals suggests crystallization at pressures between 400 and 800 MPa, indicating that these granitoids were emplaced at different crustal depths. |
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