High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil

High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil

Abstract High-resolution stratigraphic analysis was carried out on tidal microbial carbonates from the middle part of the Lagoa do Jacaré Formation from the Ediacaran-Cambrian Bambuí Group in the Ubaí area. In a 41 meter-thick section, sixteen lithofacies and three facies associations were interpreted as deposits of supratidal, intertidal, and subtidal settings. The tidal cycles are asymmetric and shallow upward, the high-resolution stratigraphic approach allowed inferences as to short-term and long-term fluctuations of sea level during deposition. The metric tidal ranges here described suggest strong tidal currents, which is incompatible with the giant enclosed sea model as an analog for Bambuí deposition, given that tidal ranges in suc seas are null or less than a few decimeters. Therefore, we suggest that the Ubaí carbonates were deposited in a semi-enclosed epicontinental sea subject to strong tidal forces when the formerly resticted Bambuí Basin reopened probably during deposition of the upper half of the Lagoa do Jacaré Formation, as suggested by previous isotopic data and now reinforced by our sedimentologic and stratigraphic field data.

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Main Authors: Moura,Samuel Amaral, Uhlein,Alexandre, Uhlein,Gabriel Jubé, Dantas,Márcio Vinicius Santana
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Geologia 2022
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200602
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spelling oai:scielo:S2317-488920220002006022022-04-25High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, BrazilMoura,Samuel AmaralUhlein,AlexandreUhlein,Gabriel JubéDantas,Márcio Vinicius Santana tidal cycles cyclostratigraphy stacking patterns restricted basin Ediacaran Abstract High-resolution stratigraphic analysis was carried out on tidal microbial carbonates from the middle part of the Lagoa do Jacaré Formation from the Ediacaran-Cambrian Bambuí Group in the Ubaí area. In a 41 meter-thick section, sixteen lithofacies and three facies associations were interpreted as deposits of supratidal, intertidal, and subtidal settings. The tidal cycles are asymmetric and shallow upward, the high-resolution stratigraphic approach allowed inferences as to short-term and long-term fluctuations of sea level during deposition. The metric tidal ranges here described suggest strong tidal currents, which is incompatible with the giant enclosed sea model as an analog for Bambuí deposition, given that tidal ranges in suc seas are null or less than a few decimeters. Therefore, we suggest that the Ubaí carbonates were deposited in a semi-enclosed epicontinental sea subject to strong tidal forces when the formerly resticted Bambuí Basin reopened probably during deposition of the upper half of the Lagoa do Jacaré Formation, as suggested by previous isotopic data and now reinforced by our sedimentologic and stratigraphic field data.info:eu-repo/semantics/openAccessSociedade Brasileira de GeologiaBrazilian Journal of Geology v.52 n.2 20222022-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200602en10.1590/2317-4889202120210040
institution SCIELO
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country Brasil
countrycode BR
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access En linea
databasecode rev-scielo-br
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region America del Sur
libraryname SciELO
language English
format Digital
author Moura,Samuel Amaral
Uhlein,Alexandre
Uhlein,Gabriel Jubé
Dantas,Márcio Vinicius Santana
spellingShingle Moura,Samuel Amaral
Uhlein,Alexandre
Uhlein,Gabriel Jubé
Dantas,Márcio Vinicius Santana
High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil
author_facet Moura,Samuel Amaral
Uhlein,Alexandre
Uhlein,Gabriel Jubé
Dantas,Márcio Vinicius Santana
author_sort Moura,Samuel Amaral
title High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil
title_short High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil
title_full High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil
title_fullStr High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil
title_full_unstemmed High-resolution stratigraphy of peritidal microbial carbonates from the Lagoa do Jacaré Formation, Bambuí Group, north of Minas Gerais state, Brazil
title_sort high-resolution stratigraphy of peritidal microbial carbonates from the lagoa do jacaré formation, bambuí group, north of minas gerais state, brazil
description Abstract High-resolution stratigraphic analysis was carried out on tidal microbial carbonates from the middle part of the Lagoa do Jacaré Formation from the Ediacaran-Cambrian Bambuí Group in the Ubaí area. In a 41 meter-thick section, sixteen lithofacies and three facies associations were interpreted as deposits of supratidal, intertidal, and subtidal settings. The tidal cycles are asymmetric and shallow upward, the high-resolution stratigraphic approach allowed inferences as to short-term and long-term fluctuations of sea level during deposition. The metric tidal ranges here described suggest strong tidal currents, which is incompatible with the giant enclosed sea model as an analog for Bambuí deposition, given that tidal ranges in suc seas are null or less than a few decimeters. Therefore, we suggest that the Ubaí carbonates were deposited in a semi-enclosed epicontinental sea subject to strong tidal forces when the formerly resticted Bambuí Basin reopened probably during deposition of the upper half of the Lagoa do Jacaré Formation, as suggested by previous isotopic data and now reinforced by our sedimentologic and stratigraphic field data.
publisher Sociedade Brasileira de Geologia
publishDate 2022
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200602
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