Early Devonian miospores and organic geochemistry from the Alto Garças Sub-Basin (Paraná Basin), Brazil: biostratigraphic, palaeogeographic and palaeoenvironmental implications

GARCÍA MURO, VICTORIA J.; CLAUDIA VIVIANA RUBINSTEIN; PEREIRA, EGBERTO; BERGAMASCHI, SÉRGIO ; MENDLOWICZ MAULLER, PAULA ; STEEMANS, PHILIPPE

REVIEW OF PALAEOBOTANY AND PALYNOLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2019 p. 1 - 31

0034-6667

The presentstudy concerns the palynology (mainly miospores), and geochemistry of theJaciara section, situated 5 km from the town of Jaciara, Mato Grosso, in theParaná Basin of Brazil. The age of this outcrop is considered to be EarlyDevonian. A study of the whole assemblage has highlighted a diversifiedassociation of miospores. Their distribution throughout the samples is somewhaterratic, which sometimes complicates the determination of the biostratigraphicattribution. However the following markers have been identified: Apiculiretusispora brandtii, Brochotriletesbellatulus, Cymbohilates baqaensis, Cymbosporitesasymmetricus, Cymbosporites wellmanii, Devonomonoletes sp. 1 in Breuer andSteemans (2013), Dibolispotites sp. 2in Breuer and Steemans (2013), Dictyotriletes subgranifer,Distaverrucosisporites steemansii, Latosporites ovalis, Scylaspora costulosa, Verrucosisporites nafudensis,Verrucosisporites onustus, Verruciosisporites stictus, Zonotriletesbrevivelatus, and Zonotriletessimplicissimus. The finding of these miospores allowedrecognition of the following biozones established in Saudi Arabia: the papillensis-baqaenisisBiozone, Pragian in age; the ovalis-biornatus Biozone (ovalis, milleri,asymmetricus subzones), late Pragian to early Emsian in age; and possibly the lindlarensis-sextantii Biozone,middle Emsian in age.Thepresence of many taxa in common with other Gondwanan basins, particularly thosefrom Saudi Arabia, North Africa and South America, corroborates thepalaeogeographic relationship between different regions of Gondwana, evenbetween those located in very different palaeolatitudes.Newgeochemical analyses were also performed and add more information towards theunderstanding of the local palaeoenvironmental evolution.