Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Geology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000400673 |
Resumo: | ABSTRACT: Santa Marta is a 10 km wide, reasonably well preserved, complex impact structure located in southwestern Piauí state, northeastern Brazil, with a central uplift of 3.2 km diameter. The Santa Marta structure was recently recognized as the sixth confirmed impact structure in Brazil, based on widespread occurrence of shatter cones and the presence of shock deformation features in quartz. The latter includes planar deformation features (PDF), planar fractures (PF), and feather features (FF). The structure was formed in sedimentary strata (conglomerates, sandstones, siltstones and shales) accumulated in two distinct sedimentary basins that overlap in this region: the Paleozoic Parnaíba and the Mesozoic Sanfranciscan basins. Here, we provide an overview of the geology and stratigraphy of the sedimentary successions that occur within the structure, focusing especially on the deformation aspects of the strata from the central area. This study is aimed at advancing the knowledge about Brazilian impact structures and contributing to a better comprehension of impact cratering in sedimentary targets. The deformation in the Santa Marta structure is directly related to variations in the thickness of sedimentary strata and to lithologic diversity in the interior of the structure, which determined the complexity of the deformation, including the formation of inner rings. |
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Brazilian Journal of Geology |
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Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, BrazilSanta Martacomplex impact structureParnaíba BasinSanfranciscan Basinshock deformationABSTRACT: Santa Marta is a 10 km wide, reasonably well preserved, complex impact structure located in southwestern Piauí state, northeastern Brazil, with a central uplift of 3.2 km diameter. The Santa Marta structure was recently recognized as the sixth confirmed impact structure in Brazil, based on widespread occurrence of shatter cones and the presence of shock deformation features in quartz. The latter includes planar deformation features (PDF), planar fractures (PF), and feather features (FF). The structure was formed in sedimentary strata (conglomerates, sandstones, siltstones and shales) accumulated in two distinct sedimentary basins that overlap in this region: the Paleozoic Parnaíba and the Mesozoic Sanfranciscan basins. Here, we provide an overview of the geology and stratigraphy of the sedimentary successions that occur within the structure, focusing especially on the deformation aspects of the strata from the central area. This study is aimed at advancing the knowledge about Brazilian impact structures and contributing to a better comprehension of impact cratering in sedimentary targets. The deformation in the Santa Marta structure is directly related to variations in the thickness of sedimentary strata and to lithologic diversity in the interior of the structure, which determined the complexity of the deformation, including the formation of inner rings.Sociedade Brasileira de Geologia2017-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000400673Brazilian Journal of Geology v.47 n.4 2017reponame:Brazilian Journal of Geologyinstname:Sociedade Brasileira de Geologia (SBGEO)instacron:SBGEO10.1590/2317-4889201720160095info:eu-repo/semantics/openAccessOliveira,Grace Juliana Gonçalves deChamani,Marlei Antônio CarrariGóes,Ana MariaCrósta,Alvaro PenteadoVasconcelos,Marcos Alberto RodriguesReimold,Wolf Uweeng2017-12-19T00:00:00Zoai:scielo:S2317-48892017000400673Revistahttp://bjg.siteoficial.ws/index.htmhttps://old.scielo.br/oai/scielo-oai.phpsbgsede@sbgeo.org.br||claudio.riccomini@gmail.com2317-46922317-4692opendoar:2017-12-19T00:00Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO)false |
dc.title.none.fl_str_mv |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil |
title |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil |
spellingShingle |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil Oliveira,Grace Juliana Gonçalves de Santa Marta complex impact structure Parnaíba Basin Sanfranciscan Basin shock deformation |
title_short |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil |
title_full |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil |
title_fullStr |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil |
title_full_unstemmed |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil |
title_sort |
Geological investigation of the central portion of the Santa Marta impact structure, Piauí State, Brazil |
author |
Oliveira,Grace Juliana Gonçalves de |
author_facet |
Oliveira,Grace Juliana Gonçalves de Chamani,Marlei Antônio Carrari Góes,Ana Maria Crósta,Alvaro Penteado Vasconcelos,Marcos Alberto Rodrigues Reimold,Wolf Uwe |
author_role |
author |
author2 |
Chamani,Marlei Antônio Carrari Góes,Ana Maria Crósta,Alvaro Penteado Vasconcelos,Marcos Alberto Rodrigues Reimold,Wolf Uwe |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Oliveira,Grace Juliana Gonçalves de Chamani,Marlei Antônio Carrari Góes,Ana Maria Crósta,Alvaro Penteado Vasconcelos,Marcos Alberto Rodrigues Reimold,Wolf Uwe |
dc.subject.por.fl_str_mv |
Santa Marta complex impact structure Parnaíba Basin Sanfranciscan Basin shock deformation |
topic |
Santa Marta complex impact structure Parnaíba Basin Sanfranciscan Basin shock deformation |
description |
ABSTRACT: Santa Marta is a 10 km wide, reasonably well preserved, complex impact structure located in southwestern Piauí state, northeastern Brazil, with a central uplift of 3.2 km diameter. The Santa Marta structure was recently recognized as the sixth confirmed impact structure in Brazil, based on widespread occurrence of shatter cones and the presence of shock deformation features in quartz. The latter includes planar deformation features (PDF), planar fractures (PF), and feather features (FF). The structure was formed in sedimentary strata (conglomerates, sandstones, siltstones and shales) accumulated in two distinct sedimentary basins that overlap in this region: the Paleozoic Parnaíba and the Mesozoic Sanfranciscan basins. Here, we provide an overview of the geology and stratigraphy of the sedimentary successions that occur within the structure, focusing especially on the deformation aspects of the strata from the central area. This study is aimed at advancing the knowledge about Brazilian impact structures and contributing to a better comprehension of impact cratering in sedimentary targets. The deformation in the Santa Marta structure is directly related to variations in the thickness of sedimentary strata and to lithologic diversity in the interior of the structure, which determined the complexity of the deformation, including the formation of inner rings. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-12-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000400673 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000400673 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/2317-4889201720160095 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Geology v.47 n.4 2017 reponame:Brazilian Journal of Geology instname:Sociedade Brasileira de Geologia (SBGEO) instacron:SBGEO |
instname_str |
Sociedade Brasileira de Geologia (SBGEO) |
instacron_str |
SBGEO |
institution |
SBGEO |
reponame_str |
Brazilian Journal of Geology |
collection |
Brazilian Journal of Geology |
repository.name.fl_str_mv |
Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO) |
repository.mail.fl_str_mv |
sbgsede@sbgeo.org.br||claudio.riccomini@gmail.com |
_version_ |
1752122398820270080 |