Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links

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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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Autores principales: Massabie, A.C., Nestiero, O.E., Sanguinetti, A.S.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v63_n2_p163_Massabie
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v63_n2_p163_Massabie
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spelling todo:paper_00044822_v63_n2_p163_Massabie2023-10-03T13:58:21Z Cohesive breccias and microbreccias in quartzites in the Buenos Aires ranges: Similitude, differences, and an approximation to their tectonic links Massabie, A.C. Nestiero, O.E. Sanguinetti, A.S. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v63_n2_p163_Massabie
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
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, A.C.
Nestiero, O.E.
Sanguinetti, A.S.
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.
format JOUR
author Massabie, A.C.
Nestiero, O.E.
Sanguinetti, A.S.
author_facet Massabie, A.C.
Nestiero, O.E.
Sanguinetti, A.S.
author_sort Massabie, A.C.
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
url http://hdl.handle.net/20.500.12110/paper_00044822_v63_n2_p163_Massabie
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AT nestierooe cohesivebrecciasandmicrobrecciasinquartzitesinthebuenosairesrangessimilitudedifferencesandanapproximationtotheirtectoniclinks
AT sanguinettias cohesivebrecciasandmicrobrecciasinquartzitesinthebuenosairesrangessimilitudedifferencesandanapproximationtotheirtectoniclinks
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