A summary of the Brazilian Paraná Basin Ordovician
The study of the Ordovician of Paraná Basin culminated on the three-fold lithostratigraphic subdivision of the Rio Ivaà Group as follows: Alto Garças, Iapó and Vila Maria formations. The history of deposition of these rocks is linked to the transition from a marine fluvial environment into the g...
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| Format: | Article |
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Estonian Academy Publishers
2023-06-01
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| Series: | Estonian Journal of Earth Sciences |
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| Online Access: | https://kirj.ee/wp-content/plugins/kirj/pub/earth-1-2023-167_20230614073642.pdf |
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| author | Carolina Zabini Lívia Rodrigues Fernando Lavié Ana Beatriz Furtado-Carvalho Enrique Alberto Randolfe Juan José Rustán Francisco Arouca Ana Laura Silva Gomes Rodrigo Adôrno Matheus Denezine Dermeval A. do Carmo Mário L. Assine |
| author_facet | Carolina Zabini Lívia Rodrigues Fernando Lavié Ana Beatriz Furtado-Carvalho Enrique Alberto Randolfe Juan José Rustán Francisco Arouca Ana Laura Silva Gomes Rodrigo Adôrno Matheus Denezine Dermeval A. do Carmo Mário L. Assine |
| author_sort | Carolina Zabini |
| collection | DOAJ |
| description | The study of the Ordovician of Paraná Basin culminated on the three-fold lithostratigraphic subdivision of the Rio Ivaà Group as follows: Alto Garças, Iapó and Vila Maria formations. The history of deposition of these rocks is linked to the transition from a marine fluvial environment into the glacial diamictites and shales with dropstones, overlain by post-glacial transgressive shales, siltstones and sandstones. The OrdovicianâSilurian transition is marked by a glacial and an extinction event that impacted the marine diversity of life and the permanence of the first land plants. At least three sections, designated as the sections 1, 2 and 3 below, had their sedimentary facies, taphonomy, organic carbon content and thermal maturation analysed as well as their macro- and microfossil assemblages recognized.
All studied sections were productive for macro- and microfossils, although the section 1 has limited occurrence and lower preservation of palynomorphs. The greatest fossil diversity was recovered from the section 2. To date, the diversity recovered from the OrdovicianâSilurian of the Paraná Basin comprises 12 fossil groups, namely ostracods, brachiopods, bivalves, gastropods, cryptospores, fungi, acritarchs, chitinozoans, prasinophyte algae, scoleÂcodonts, a possible graptolite and, more recently, a trilobite of the order Dalmanitidae. 51 species of palynomorphs of terrestrial and marine origin were recognized. This is the highest diversity reported from the glacialâpostglacial transition in the OrdovicianâSilurian boundary interval of Brazil. 18 species of cryptospores, acritarchs and fungi occur in the basal diamictites (the Iapó Formation) as well as the discinoid Kosoidea australis. In the upper part of these diamictites, the palynomorph assemblage comprises 26 taxa, most of which persist also in the postglacial shales. Still, in the shales with dropstones of the Iapó Formation, brachiopods (K. australis, infaunal lingulids, ?Palaeoglossa and rhynchonelliformeans), endemic ostracods such as Satiellina paranaensis and pyritized specimens of a widely common Hirnantian index species Harpabollia harparum occur together with indeterminable ostracod species. At least two different species of bivalve mollusks were also found as well as a gastropod species (Bucanellasp.).
Observing the palynomorph assemblage, it was possible to record also chitinozoans restricted to the lowermost portion of the Vila Maria Formation. This part of the formation was observed in the outcrops 2 and 3 and contains postglacial chitinozoan assemblages that are not younger than the earliest Rhuddanian. Some centimeters above this interval but still in the lower part of the Vila Maria Formation, the occurrence of Spinachitina debbajae followed by Spinachitina silurica refer to the Silurian in the Paraná Basin. In the section 1, the recovery of a trilobite thorax configures the oldest record of this group in Brazil and shows that this ancient sea was also thriving with life even after the glaciation-related Hirnantian extinction event. |
| first_indexed | 2024-03-13T05:36:38Z |
| format | Article |
| id | doaj.art-7d4f002e1de3415882689dc3ac083ab8 |
| institution | Directory Open Access Journal |
| issn | 1736-4728 1736-7557 |
| language | English |
| last_indexed | 2024-03-13T05:36:38Z |
| publishDate | 2023-06-01 |
| publisher | Estonian Academy Publishers |
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| series | Estonian Journal of Earth Sciences |
| spelling | doaj.art-7d4f002e1de3415882689dc3ac083ab82023-06-14T07:33:29ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47281736-75572023-06-017211670https://doi.org/10.3176/earth.2023.26https://doi.org/10.3176/earth.2023.26A summary of the Brazilian Paraná Basin OrdovicianCarolina Zabini0Lívia Rodrigues1Fernando Lavié2Ana Beatriz Furtado-Carvalho3Enrique Alberto Randolfe4Juan José Rustán5Francisco Arouca6Ana Laura Silva Gomes7Rodrigo Adôrno8Matheus Denezine9Dermeval A. do Carmo10Mário L. Assine11Institute of Geosciences, University of Campinas, Carlos Gomes, 250, Cidade Universitária, 13083-855, Campinas, São Paulo, BrazilUniversity of Brasília, Institute of Geosciences, Campus Darcy Ribeiro, Asa Norte 70910-900, Brasília-DF, BrazilCentro de Investigaciones en Ciencias de la Tierra: Consejo Nacional de Investigaciones Científicas y Técnicas–Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Córdoba (X5016GCA), ArgentinaDepartment of Geology and Natural Resources, Institute of Geosciences, University of Campinas, Rua Carlos Gomes, 250, 13083-855, Campinas-SP, BrazilCentro de Investigaciones en Ciencias de la Tierra: Consejo Nacional de Investigaciones Científicas y Técnicas–Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Córdoba (X5016GCA), ArgentinaCentro de Investigaciones en Ciencias de la Tierra: Consejo Nacional de Investigaciones Científicas y Técnicas–Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Córdoba (X5016GCA), Argentina; Universidad Nacional de La Rioja, Av. Luis M. de la Fuente S/N, Ciudad Universitaria de la Ciencia y de la Técnica, F5300, La Rioja, ArgentinaDepartment of Geology and Natural Resources, Institute of Geosciences, University of Campinas, Rua Carlos Gomes, 250, 13083-855, Campinas-SP, BrazilDepartment of Geology and Natural Resources, Institute of Geosciences, University of Campinas, Rua Carlos Gomes, 250, 13083-855, Campinas-SP, BrazilCenter of Applied Geosciences – CGA Geological Survey of Brasília, Setor Bancário Norte, CEP 70040-904, Brasília-DF, BrazilUniversity of Brasília, Institute of Geosciences, Campus Darcy Ribeiro, Asa Norte 70910-900, Brasília-DF, BrazilUniversity of Brasília, Institute of Geosciences, Campus Darcy Ribeiro, Asa Norte 70910-900, Brasília-DF, BrazilUniversity of Brasília, Institute of Geosciences, Campus Darcy Ribeiro, Asa Norte 70910-900, Brasília-DF, BrazilThe study of the Ordovician of Paraná Basin culminated on the three-fold lithostratigraphic subdivision of the Rio Ivaà Group as follows: Alto Garças, Iapó and Vila Maria formations. The history of deposition of these rocks is linked to the transition from a marine fluvial environment into the glacial diamictites and shales with dropstones, overlain by post-glacial transgressive shales, siltstones and sandstones. The OrdovicianâSilurian transition is marked by a glacial and an extinction event that impacted the marine diversity of life and the permanence of the first land plants. At least three sections, designated as the sections 1, 2 and 3 below, had their sedimentary facies, taphonomy, organic carbon content and thermal maturation analysed as well as their macro- and microfossil assemblages recognized. All studied sections were productive for macro- and microfossils, although the section 1 has limited occurrence and lower preservation of palynomorphs. The greatest fossil diversity was recovered from the section 2. To date, the diversity recovered from the OrdovicianâSilurian of the Paraná Basin comprises 12 fossil groups, namely ostracods, brachiopods, bivalves, gastropods, cryptospores, fungi, acritarchs, chitinozoans, prasinophyte algae, scoleÂcodonts, a possible graptolite and, more recently, a trilobite of the order Dalmanitidae. 51 species of palynomorphs of terrestrial and marine origin were recognized. This is the highest diversity reported from the glacialâpostglacial transition in the OrdovicianâSilurian boundary interval of Brazil. 18 species of cryptospores, acritarchs and fungi occur in the basal diamictites (the Iapó Formation) as well as the discinoid Kosoidea australis. In the upper part of these diamictites, the palynomorph assemblage comprises 26 taxa, most of which persist also in the postglacial shales. Still, in the shales with dropstones of the Iapó Formation, brachiopods (K. australis, infaunal lingulids, ?Palaeoglossa and rhynchonelliformeans), endemic ostracods such as Satiellina paranaensis and pyritized specimens of a widely common Hirnantian index species Harpabollia harparum occur together with indeterminable ostracod species. At least two different species of bivalve mollusks were also found as well as a gastropod species (Bucanellasp.). Observing the palynomorph assemblage, it was possible to record also chitinozoans restricted to the lowermost portion of the Vila Maria Formation. This part of the formation was observed in the outcrops 2 and 3 and contains postglacial chitinozoan assemblages that are not younger than the earliest Rhuddanian. Some centimeters above this interval but still in the lower part of the Vila Maria Formation, the occurrence of Spinachitina debbajae followed by Spinachitina silurica refer to the Silurian in the Paraná Basin. In the section 1, the recovery of a trilobite thorax configures the oldest record of this group in Brazil and shows that this ancient sea was also thriving with life even after the glaciation-related Hirnantian extinction event.https://kirj.ee/wp-content/plugins/kirj/pub/earth-1-2023-167_20230614073642.pdfbrachiopodsostracodstrilobitepalynomorphstaphonomyhirnantian |
| spellingShingle | Carolina Zabini Lívia Rodrigues Fernando Lavié Ana Beatriz Furtado-Carvalho Enrique Alberto Randolfe Juan José Rustán Francisco Arouca Ana Laura Silva Gomes Rodrigo Adôrno Matheus Denezine Dermeval A. do Carmo Mário L. Assine A summary of the Brazilian Paraná Basin Ordovician Estonian Journal of Earth Sciences brachiopods ostracods trilobite palynomorphs taphonomy hirnantian |
| title | A summary of the Brazilian Paraná Basin Ordovician |
| title_full | A summary of the Brazilian Paraná Basin Ordovician |
| title_fullStr | A summary of the Brazilian Paraná Basin Ordovician |
| title_full_unstemmed | A summary of the Brazilian Paraná Basin Ordovician |
| title_short | A summary of the Brazilian Paraná Basin Ordovician |
| title_sort | summary of the brazilian parana basin ordovician |
| topic | brachiopods ostracods trilobite palynomorphs taphonomy hirnantian |
| url | https://kirj.ee/wp-content/plugins/kirj/pub/earth-1-2023-167_20230614073642.pdf |
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