Lower Devonian faunas and palynomorphs from the Dornes Syncline (Central Iberian Zone, Portugal): stratigraphical and paleogeographical implications

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URI: http://hdl.handle.net/2042/35627  |   DOI : 10.4267/2042/35627
Title: Lower Devonian faunas and palynomorphs from the Dornes Syncline (Central Iberian Zone, Portugal): stratigraphical and paleogeographical implications
Author: GOURVENNEC, Rémy; PIÇARRA, José Manuel; PLUSQUELLEC, Yves; PEREIRA, Zélia; OLIVEIRA, José Tomás; ROBARDET, Michel
Abstract: In the Dornes syncline, southern Central Iberian Zone, Portugal, the uppermost levels of the Serra do Luação Formation up to now have been considered to be of Pridoli-Lochkovian? age because they lie immediately under the Dornes Formation, which is of Pragian age and is well defined stratigra-phically. New paleontological elements including benthic faunas and palynomorphs allow us to confirm that the top of the Serra do Luação Formation is securely Lochkovian, for upper Lochkovian strata are present although relatively thin. The transition from the Serra do Luação to the Dornes formations and their lithostratigraphical relationship are now clear: the terrigenous succession belongs to the Serra do Luação Formation and the limestones represent the Dornes Formation. The benthic faunas clearly have North-Gondwanan affinities.
Description: Dans le Synclinal de Dornes, sud de la Zone Centre-Ibérique, Portugal, le sommet de la Formation de Serra do Luação, était jusqu'à présent attribué au Pridoli-Lochkovien? par sa position relative sous la Forma-tion de Dornes, mieux calée stratigraphiquement et d'âge Praguien. De nouveaux arguments paléonto-logiques concernant les faunes benthiques et les palynomorphes viennent confirmer que le sommet de la Formation de Serra do Luação appartient bien au Lochkovien, les derniers mètres représentant un Lochkovien supérieur fortement condensé. La transition entre les formations de Serra do Luação et de Dornes ainsi que leur position lithostratigraphique sont désormais éclaircies : les alternances silico-clastiques appartiennent bien à la Formation de Serra do Luação tandis que les niveaux calcaires appartiennent à la Formation de Dornès. Les faunes benthiques récoltées indiquent d'évidentes affinités Nord-Gondwaniennes.
Subject: Lower Devonian; Lochkovian; Central Iberian Zone; Portugal; Brachiopods; Tabulate corals; palynomorphs; paleogeography; Dévonien inférieur ; Lochkovien ; Zone Centre Ibérique ; Portugal ; Brachiopodes ; co-raux Tabulés ; palynomorphes ; paléogéographie
Publisher: Association "Carnets de Géologie"
Date: 2010

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