This study represents a contribution to the biostratigraphic characterization of the Gulf of Gabes Triassic series. Diverse and well preserved palynological assemblages from the Djerba Melita 1 (DJM1) well in the Djerba Island (Gulf of Gabes, Southern Tunisia) are here presented and discussed. A Carnian microflora is recorded in the Triassic portion of the drilled succession. The co-occurrence of Ladinian-lower Carnian taxa in association with typical Carnian elements allows to refer the microflora to the lower part of the Duplicisporites continuus palynological assemblage (late Julian, Austrotrachyceras austriacus Subzone). A semi-quantitative analysis of the assemblages also seems to document the occurrence, in the middle-upper part (units 3 and 4) of DJM1 well of the Aulisporites-Aratrisporites Acme Zone, an ammonoid-calibrated palynological event occurring in several European successions, referring to the late Julian/early Tuvalian. The occurrence of this acme zone in Southern Tunisia encourages its application also to Triassic sedimentary records belonging to the southern Tethyan margin.
A Carnian (Julian) microflora from the Djerba Melita 1 borehole (Gulf of Gabes, South-eastern Tunisia)
CIRILLI, Simonetta;
2012
Abstract
This study represents a contribution to the biostratigraphic characterization of the Gulf of Gabes Triassic series. Diverse and well preserved palynological assemblages from the Djerba Melita 1 (DJM1) well in the Djerba Island (Gulf of Gabes, Southern Tunisia) are here presented and discussed. A Carnian microflora is recorded in the Triassic portion of the drilled succession. The co-occurrence of Ladinian-lower Carnian taxa in association with typical Carnian elements allows to refer the microflora to the lower part of the Duplicisporites continuus palynological assemblage (late Julian, Austrotrachyceras austriacus Subzone). A semi-quantitative analysis of the assemblages also seems to document the occurrence, in the middle-upper part (units 3 and 4) of DJM1 well of the Aulisporites-Aratrisporites Acme Zone, an ammonoid-calibrated palynological event occurring in several European successions, referring to the late Julian/early Tuvalian. The occurrence of this acme zone in Southern Tunisia encourages its application also to Triassic sedimentary records belonging to the southern Tethyan margin.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.