Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links
Quartzitic sandstones of the sierras Bayas Group in Sierras Septentrionales of Buenos Aires are studied. Outcrops of these deformed rocks are observed at sierras Bayas and Barker localities, where quartzitic sandstones from Precambrian units are present. These rocks are compared with similar fault b...
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ftunibueairesbd:paper:paper_00044822_v63_n2_p163_Massabie 2023-05-15T18:21:10+02:00 Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links Massabie, Armando Carlos Nestiero, Osvaldo E. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n2_p163_Massabie https://hdl.handle.net/20.500.12110/paper_00044822_v63_n2_p163_Massabie unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n2_p163_Massabie http://hdl.handle.net/20.500.12110/paper_00044822_v63_n2_p163_Massabie Breccias Fault rocks Microbreccia cohesive Sierras de Buenos Aires breccia deformation mechanism extensional tectonics fault zone faulting greenschist facies metamorphism outcrop Precambrian protolith quartzite tectonic setting Argentina Buenos Aires [Argentina] Sierras Australes Sierras Septentrionales South America 2008 ftunibueairesbd https://doi.org/20.500.12110/paper_00044822_v63_n2_p163_Massabie 2023-02-16T02:27:50Z Quartzitic sandstones of the sierras Bayas Group in Sierras Septentrionales of Buenos Aires are studied. Outcrops of these deformed rocks are observed at sierras Bayas and Barker localities, where quartzitic sandstones from Precambrian units are present. These rocks are compared with similar fault breccias in Sierras Australes of Buenos Aires, which were develop in quartzitic rocks of several Paleozoic units of this region. At both regions, fault zones are subvertical layers with acute contacts on the wall rocks. An original sedimentary protolith is recognized in textures and structures preserved in all samples of Sierras Bayas. Sedimentary textures at Sierras Australes are obliterated by penetrative deformation in greenschists facies methamorphism and also show a metaquartzitic protolith. In both analyzed regions, similar cataclastic textures are observed. All these breccias and microbreccias would be associated with a major extensional tectonic event of Jurassic - Cretaceous age, which could be related to the origin of Colorado and Salado extensional basins during the opening of the South Atlantic Ocean. Fil:Massabie, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Nestiero, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Other/Unknown Material South Atlantic Ocean Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Argentina Wall Rocks ENVELOPE(-129.312,-129.312,52.728,52.728) |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Breccias Fault rocks Microbreccia cohesive Sierras de Buenos Aires breccia deformation mechanism extensional tectonics fault zone faulting greenschist facies metamorphism outcrop Precambrian protolith quartzite tectonic setting Argentina Buenos Aires [Argentina] Sierras Australes Sierras Septentrionales South America |
spellingShingle |
Breccias Fault rocks Microbreccia cohesive Sierras de Buenos Aires breccia deformation mechanism extensional tectonics fault zone faulting greenschist facies metamorphism outcrop Precambrian protolith quartzite tectonic setting Argentina Buenos Aires [Argentina] Sierras Australes Sierras Septentrionales South America Massabie, Armando Carlos Nestiero, Osvaldo E. Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links |
topic_facet |
Breccias Fault rocks Microbreccia cohesive Sierras de Buenos Aires breccia deformation mechanism extensional tectonics fault zone faulting greenschist facies metamorphism outcrop Precambrian protolith quartzite tectonic setting Argentina Buenos Aires [Argentina] Sierras Australes Sierras Septentrionales South America |
description |
Quartzitic sandstones of the sierras Bayas Group in Sierras Septentrionales of Buenos Aires are studied. Outcrops of these deformed rocks are observed at sierras Bayas and Barker localities, where quartzitic sandstones from Precambrian units are present. These rocks are compared with similar fault breccias in Sierras Australes of Buenos Aires, which were develop in quartzitic rocks of several Paleozoic units of this region. At both regions, fault zones are subvertical layers with acute contacts on the wall rocks. An original sedimentary protolith is recognized in textures and structures preserved in all samples of Sierras Bayas. Sedimentary textures at Sierras Australes are obliterated by penetrative deformation in greenschists facies methamorphism and also show a metaquartzitic protolith. In both analyzed regions, similar cataclastic textures are observed. All these breccias and microbreccias would be associated with a major extensional tectonic event of Jurassic - Cretaceous age, which could be related to the origin of Colorado and Salado extensional basins during the opening of the South Atlantic Ocean. Fil:Massabie, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Nestiero, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. |
author |
Massabie, Armando Carlos Nestiero, Osvaldo E. |
author_facet |
Massabie, Armando Carlos Nestiero, Osvaldo E. |
author_sort |
Massabie, Armando Carlos |
title |
Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links |
title_short |
Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links |
title_full |
Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links |
title_fullStr |
Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links |
title_full_unstemmed |
Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links |
title_sort |
cohesive breccias and microbreccias in quartzites in the buenos aires ranges: similitude, differences, and an approximation to their tectonic links |
publishDate |
2008 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n2_p163_Massabie https://hdl.handle.net/20.500.12110/paper_00044822_v63_n2_p163_Massabie |
long_lat |
ENVELOPE(-129.312,-129.312,52.728,52.728) |
geographic |
Argentina Wall Rocks |
geographic_facet |
Argentina Wall Rocks |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n2_p163_Massabie http://hdl.handle.net/20.500.12110/paper_00044822_v63_n2_p163_Massabie |
op_doi |
https://doi.org/20.500.12110/paper_00044822_v63_n2_p163_Massabie |
_version_ |
1766200290498838528 |