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Sedimentology and U-Pb dating of Carboniferous to Permian continental series of the northern Massif Central (France): Local palaeogeographic evolution and larger scale correlations

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Autor(es):
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Ducassou, C. [1] ; Mercuzot, M. [1] ; Bourquin, S. [1] ; Rossignol, C. [2] ; Pellenard, P. [3, 4] ; Beccaletto, L. [5] ; Poujol, M. [1] ; Hallot, E. [1] ; Pierson-Wickmann, A. C. [1] ; Hue, C. [1] ; Ravier, E.
Número total de Autores: 11
Afiliação do(s) autor(es):
[1] Univ Rennes, CNRS, UMR 6118, Geosci Rennes, F-35000 Rennes - France
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Geofis, Rua Matao 1226, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil
[3] Univ Bourgogne Franche Comte, CNRS 6282, Biogeosci UMR uB, F-21000 Dijon - France
[4] Le Mans Univ, CNRS, Lab Planetol & Geodynam, UMR 6112, Ave Olivier Messiaen, F-72085 Le Mans 9 - France
[5] Bur Rech Geol & Miniere, 3 Ave Claude Guillemin, F-45100 Orleans - France
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY; v. 533, NOV 1 2019.
Citações Web of Science: 0
Resumo

The Carboniferous to Permian volcanic-sedimentary succession shown by the LY-F core from the Lucenay-les-Aix area, in the northern part of the Massif Central, has been studied in order to obtain both landscape reconstructions (sedimentological analyses) and geochronological constraints (U-Pb dating on zircon and apatite). The lowermost part of the core consists mainly of lacustrine deposits with Gilbert-type delta and volcaniclastic-rich fan delta deposits including several altered volcanic ash layers (tonstein). In contrast, in the uppermost part of the core, playa-lake deposits dominate. LA-ICP-MS U-Pb analyses were performed on both zircon and apatite grains from interbedded tonsteins. This coupled U-Pb dating approach allows to assess potential reworking of volcanic material or the occurrence of non-volcanic grains, such as xenocrysts, in order to provide better evaluations for the depositional ages of the tonsteins. These investigations reveal that sedimentation took place between the late Gzhelian and the late Sakmarian (i.e., between c. 301 and 290 Ma). This sedimentary succession can therefore be compared to those from adjacent basins for which geochronological constraints are available (i.e., Autun and Lodeve basins, resp. located north and south of the Massif Central). This study provides a reference section for future comparisons with similar sections from other Carboniferous to Permian basins, in France as well as elsewhere in Europe. (AU)

Processo FAPESP: 18/02645-2 - Cronestratigrafia e rastreamento isotópico do Supergrupo Minas, Paleoproterozóico
Beneficiário:Camille Yann Rossignol
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 15/16235-2 - Evolução da vida e oxigenação da terra primitiva: uma perspectiva a partir da América do Sul
Beneficiário:Pascal Andre Marie Philippot
Linha de fomento: Auxílio à Pesquisa - Programa SPEC