43 documents found, page 1 of 5
Palynology of the Albian–Turonian sediments from the Sumbe region, Kwanza Basin...
Rodrigues, Cristina F.A.; Mendes, Márcia; Pereira, Zélia; Nsungani, P.C.; Fernandes, Paulo; Duarte, L. V.; Chitangueleca, Belarmino; Sebastião, LumenABSTRACT: Palynological investigations in the Sumbe region of the Kwanza Basin, Angola, have identified Albian to Turonian assemblages in four sections of the Quissonde Facies of the Mucanzo, Cabo Ledo, and Itombe formations. These studies aimed to determine their biostratigraphic ages and infer paleoenvironmental, paleoclimatic, and paleogeographic models. The presence of Odontochitina costata, Palaeohystricho...
Early and Middle Jurassic palynostratigraphy of the Lusitanian Basin in the pro...
Correia, Vânia; Pereira, Zélia; Riding, James; Duarte, L. V.; Henriques, Maria Helena; Fernandes, PauloSUMMARY: A palinologia é uma ferramenta muito útil nos trabalhos de bioestratigrafia e interpretações paleoambientais, e que pode ser aplicada no conhecimento da geologia da Bacia Lusitânica. Assim, foi desenvolvido um estudo palinoestratigráfico de alta-resolução em 8 cortes do Jurássico Inferior e Médio (Sinemuriano superior—base do Batoniano) da Bacia Lusitânica e, neste trabalho, são apresentados os interva...
Palynology and palynofacies studies in the lowermost Jurassic of the Lusitanian...
Vilas Boas, Margarida; Pereira, Zélia; Cirilli, Simonetta; Duarte, L. V.; Sêco, Sérgio Luís Rodrigues; Fernandes, PauloABSTRACT: he Silves Group of the Lusitanian Basin in Portugal represents the initial infill of the continental rifting basins that formed during the breakup of northern Pangaea regions. Evaporites, especially halite, mark the transition from continental to marine settings and the beginning of the deposition in passive margin basins. This work presents the results of the palynostratigraphic and palynofacies anal...
The impact of the Pliensbachian–Toarcian crisis on belemnite assemblages and si...
De Baets, Kenneth; Nätscher, Paulina S.; Rita, Patrícia; Fara, Emmanuel; Neige, Pascal; Bardin, Jérémie; Dera, Guillaume; Duarte, L. V.; Hughes, ZoeThe second-order Pliensbachian–Toarcian crisis affected major groups of marine organisms. While its impact has been intensively studied for ammonites, the response of belemnites is only currently emerging through quantitative studies. Novel overall and regional diversity analyses suggest that belemnite richness in the NW-Tethys drops at the Pliensbachian–Toarcian boundary, while overall diversity slightly incre...
Palynostratigraphy of the Triassic-Jurassic of the Silves Group, Lusitanian Bas...
Vilas Boas, Margarida; Pereira, Zélia; Cirilli, Simonetta; Duarte, L. V.; Fernandes, PauloABSTRACT: We studied the miospore assemblage from an Upper Triassic to Lower Jurassic succession of the Silves Group near Coimbra, Portugal. The latter consists of, from base to top, the Conraria, Penela, Castelo Viegas, and the Pereiros formations. The palynological assemblages allowed establishing an informal palynozonation and providing new biostratigraphic that helped constrain the age attribution to the Si...
The effects of the Jenkyns Event on the radiation of Early Jurassic dinoflagell...
Correia, Vânia; Riding, James; Duarte, L. V.; Fernandes, Paulo; Pereira, ZéliaABSTRACT: This contribution is an overview of the Early Jurassic dinoflagellate cysts of the Lusitanian Basin in Portugal, with particular emphasis on the effects of the Jenkyns Event (Toarcian Oceanic Anoxic Event) on the evolution of this planktonic group. We review and discuss data from 214 samples from six Lower Jurassic successions (upper Sinemurian to upper Toarcian) in the Lusitanian Basin. The late Plie...
Preliminary late Miocene palynomorph assemblages from the Quifangondo and Luand...
Rodrigues, C.F.; Pereira, Zélia; Mendes, Márcia; Nsungani, P.C.; Fernandes, Paulo; Lopes, Gilda; Duarte, L. V.; Aboelkomsan, W.; Taylor, E.; Tyrrell, M.ABSTRACT: A Miocene succession exposed at the Cabo Ledo and Miradouro da Lua sections in the Onshore Kwanza Basin, Angola, was examined for palynology. Palynomorphs of preliminary late Miocene age identified are presented herein. The upper part of the Quifangondo Formation is dated as middle Tortonian in age based on the co-occurrence of the pollen grain Fenestrites spinosus and the dinoflagellate species Selen...
New data on the palynology of the Triassic Jurassic boundary of the Silves Grou...
Vilas Boas, Margarida; Pereira, Zélia; Cirilli, Simonetta; Duarte, L. V.; Fernandes, PauloABSTRACT: New evidence is presented on the Triassic-Jurassic boundary in the northern Lusitanian Basin, Portugal, based on miospore assemblages from a composite Upper Triassic to Lower Jurassic succession of the Silves Group. The latter comprises, from base to top, the Conraria, Penela, Castelo Viegas and the Pereiros formations. Three informal palynological zones have been documented and compared with coeval p...
High-resolution stratigraphy, palynofacies and source rock potential of the Águ...
Duarte, L. V.; Silva, R. L.; Mendonça Filho, J. G.; Ribeiro, N. Poças; Chagas, R. B. A.
A new genus of nautiloid in the Toarcian of the Iberian peninsula (Spain and Po...
Barroso-Barcenilla, F.; Comas-Rengifo, M. J.; Duarte, L. V.; Goy, A.; Martinez, G.