Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif
La Esperanza Plutonic Complex crops out in the northern part of the North Patagonian Massif in the Upper Paleozoic magmatic belt of northern Patagonia. This magmatic complex is mainly composed of 273 Ma biotite and amphibole bearing (Prieto Granodiorite) or biotite bearing (Donosa Granite) granitoid...
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2013
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico http://hdl.handle.net/20.500.12110/paper_00044822_v70_n1_p3_MartinezDopico |
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paper:paper_00044822_v70_n1_p3_MartinezDopico2023-06-08T14:26:39Z Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif Biotite Hornblende La esperanza plutonic complex Permian Thermobarometry barometry biotite chemical composition cooling emplacement hornblende magma Paleozoic Permian pluton pressure effect temperature effect Patagonia Esperanza La Esperanza Plutonic Complex crops out in the northern part of the North Patagonian Massif in the Upper Paleozoic magmatic belt of northern Patagonia. This magmatic complex is mainly composed of 273 Ma biotite and amphibole bearing (Prieto Granodiorite) or biotite bearing (Donosa Granite) granitoids. In this study, biotite and amphibole mineral compositions are used to describe the nature of the granitic magma and to estimate the pressure and temperature at which these plutons were emplaced. Based on biotite chemistry, La Esperanza Plutonic Complex represents a calc-alkaline magma with a trend of increasing peraluminosity, which could be related to a transitional orogenic to anorogenic setting. Emplacement pressures for Prieto Granodiorite vary between 0,6 and 2,0 kbar, with higher values in an inequigranular facies which crops out to the east of La Esperanza locality. Hornblende-Plagioclase thermometer yields emplacement temperatures ranging from 630 to 790°C at high oxygen fugacity conditions. These results, combined with good qualitycooling ages, propose a shallow emplacement in an elevated thermal regime that might have lasted from Middle Permian to Permotriassic times. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico http://hdl.handle.net/20.500.12110/paper_00044822_v70_n1_p3_MartinezDopico |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Biotite Hornblende La esperanza plutonic complex Permian Thermobarometry barometry biotite chemical composition cooling emplacement hornblende magma Paleozoic Permian pluton pressure effect temperature effect Patagonia Esperanza |
| spellingShingle |
Biotite Hornblende La esperanza plutonic complex Permian Thermobarometry barometry biotite chemical composition cooling emplacement hornblende magma Paleozoic Permian pluton pressure effect temperature effect Patagonia Esperanza Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif |
| topic_facet |
Biotite Hornblende La esperanza plutonic complex Permian Thermobarometry barometry biotite chemical composition cooling emplacement hornblende magma Paleozoic Permian pluton pressure effect temperature effect Patagonia Esperanza |
| description |
La Esperanza Plutonic Complex crops out in the northern part of the North Patagonian Massif in the Upper Paleozoic magmatic belt of northern Patagonia. This magmatic complex is mainly composed of 273 Ma biotite and amphibole bearing (Prieto Granodiorite) or biotite bearing (Donosa Granite) granitoids. In this study, biotite and amphibole mineral compositions are used to describe the nature of the granitic magma and to estimate the pressure and temperature at which these plutons were emplaced. Based on biotite chemistry, La Esperanza Plutonic Complex represents a calc-alkaline magma with a trend of increasing peraluminosity, which could be related to a transitional orogenic to anorogenic setting. Emplacement pressures for Prieto Granodiorite vary between 0,6 and 2,0 kbar, with higher values in an inequigranular facies which crops out to the east of La Esperanza locality. Hornblende-Plagioclase thermometer yields emplacement temperatures ranging from 630 to 790°C at high oxygen fugacity conditions. These results, combined with good qualitycooling ages, propose a shallow emplacement in an elevated thermal regime that might have lasted from Middle Permian to Permotriassic times. |
| title |
Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif |
| title_short |
Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif |
| title_full |
Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif |
| title_fullStr |
Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif |
| title_full_unstemmed |
Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif |
| title_sort |
chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (upper permian), north patagonian massif |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico http://hdl.handle.net/20.500.12110/paper_00044822_v70_n1_p3_MartinezDopico |
| _version_ |
1768546608648028160 |