Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin
Facies descriptions of the Codó Formation in the Grajaú area are provided for the first time, and its sedimentary characteristics compared to those from the Codó area to allow paleoenvironmental reconstructions. Deposits in the Grajaú area include evaporites, limestones and argillites bearing featu...
| Autor principal: | ROSSETTI, Dilce de Fátima |
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| Outros Autores: | PAZ, Jackson Douglas Silva da, GÓES, Ana Maria |
| Grau: | Artigo |
| Idioma: | eng |
| Publicado em: |
2013
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/3407 |
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ir-2011-3407 |
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dspace |
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ir-2011-34072018-11-14T16:15:00Z Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin ROSSETTI, Dilce de Fátima PAZ, Jackson Douglas Silva da GÓES, Ana Maria Reconstrução do paleoambiente Evaporito Formação Codó Bacia de São Luís (Grajaú, MA) Facies descriptions of the Codó Formation in the Grajaú area are provided for the first time, and its sedimentary characteristics compared to those from the Codó area to allow paleoenvironmental reconstructions. Deposits in the Grajaú area include evaporites, limestones and argillites bearing features indicative of a shallow, low energy, subaqueous, saline environment exposed to meteoric and/or capillary conditions. Floodingevaporative concentration-desiccation cycles suggest a saline pan complex surrounded by extensive evaporitic mudflats. The location of the system, whether coastal or inland, is a matter open for debate. However, the later hypothesis is favored considering: 1. Sr isotopic data, with values higher than those expected for Late Aptian marine waters; 2. calcitic composition of limestones (instead of dolomitic and/or magnesitic as expected in coastal settings); and 3. presence of continental ostracods and lack of marine fauna. This interpretation is consistent with that proposed for UpperAptian deposits of the Codó area, but the depositional system there was one dominated by more stable, well-stratified, anoxic waters and evaporite precipitation in central lacustrine areas, while in the Grajaú area the salt pan was more oxygenated and ephemeral, with salt precipitation mainly in marginal areas or along surrounding mudflats. 2013-01-30T16:31:08Z 2013-01-30T16:31:08Z 2004-12 Artigo de Periódico ROSSETTI, Dilce F.; PAZ, Jackson D. S.; GÓES, Ana M. Facies analysis of the Codó formation (Late Aptian) in the Grajaú Area, Southern São Luís-Grajaú Basin. Anais da Academia Brasileira de Ciências. Rio de Janeiro, v. 76, n. 4, p. 791-806, dez. 2004. Disponível em: <http://www.scielo.br/pdf/aabc/v76n4/a12v76n4.pdf>. Acesso em: 28 jan. 2013. <http://dx.doi.org/10.1590/S0001-37652004000400012>. 0001-3765 http://repositorio.ufpa.br/jspui/handle/2011/3407 eng Acesso Aberto application/pdf |
| institution |
Repositório Institucional - Universidade Federal do Pará |
| collection |
RI-UFPA |
| language |
eng |
| topic |
Reconstrução do paleoambiente Evaporito Formação Codó Bacia de São Luís (Grajaú, MA) |
| spellingShingle |
Reconstrução do paleoambiente Evaporito Formação Codó Bacia de São Luís (Grajaú, MA) ROSSETTI, Dilce de Fátima Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin |
| topic_facet |
Reconstrução do paleoambiente Evaporito Formação Codó Bacia de São Luís (Grajaú, MA) |
| description |
Facies descriptions of the Codó Formation in the Grajaú area are provided for the first time, and its sedimentary characteristics compared to those from the Codó area to allow paleoenvironmental reconstructions. Deposits
in the Grajaú area include evaporites, limestones and argillites bearing features indicative of a shallow, low energy, subaqueous, saline environment exposed to meteoric and/or capillary conditions. Floodingevaporative concentration-desiccation cycles suggest a saline pan complex surrounded by extensive evaporitic mudflats. The location of the system, whether coastal or inland, is a matter open for debate. However, the later hypothesis is favored considering: 1. Sr isotopic data, with values higher than those expected for Late Aptian marine waters; 2. calcitic composition of limestones (instead of dolomitic and/or magnesitic as expected in coastal settings); and 3. presence of continental ostracods and lack of marine fauna. This interpretation is consistent with that proposed for UpperAptian deposits of the Codó area, but the depositional system there was one dominated by more stable, well-stratified, anoxic waters and evaporite precipitation in central lacustrine areas, while in the Grajaú area the salt pan was more oxygenated and ephemeral, with salt precipitation mainly in marginal areas or along surrounding mudflats. |
| format |
Artigo |
| author |
ROSSETTI, Dilce de Fátima |
| author2 |
PAZ, Jackson Douglas Silva da GÓES, Ana Maria |
| author2Str |
PAZ, Jackson Douglas Silva da GÓES, Ana Maria |
| title |
Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin |
| title_short |
Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin |
| title_full |
Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin |
| title_fullStr |
Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin |
| title_full_unstemmed |
Facies analysis of the Codó formation (Late Aptian) in the Grajaú area, Southern São Luís-Grajaú Basin |
| title_sort |
facies analysis of the codó formation (late aptian) in the grajaú area, southern são luís-grajaú basin |
| publishDate |
2013 |
| url |
http://repositorio.ufpa.br/jspui/handle/2011/3407 |
| _version_ |
1832604232615723008 |
| score |
11.755432 |