85 documents found, page 1 of 9

The Early and Middle Jurassic palynostratigraphy of the Lusitanian Basin (Portu...

ABSTRACT: Palynomorphs, especially dinoflagellate cysts, are important biostratigraphical and palaeoenvironmental tools and their study can be applied to the Lusitanian Basin of Portugal. A palynostratigraphical high-resolution survey was undertaken in eight Lower and Middle Jurassic (upper Sinemurian to lowermost Bathonian) sections from the Lusitanian Basin. We present the resulting biostratigraphical scheme ...

The age and depositional environments of the lower Karoo Moatize Coalfield of M...

The Moatize Coalfield belongs to a network of continental Karoo basins of central Mozambique, known as the Zambezi Basin. Palynological and sedimentological studies were performed on four coal exploration boreholes to determine the age, depositional settings, and overall geological evolution of its extensive coal deposits. Clastic formations recognised in this coalfield, in ascending order, are the Vu´zi, Moati...

Detrital zircon U-Pb geochronology of the moatize and n'condédzi coalfields, za...

Detrital zircon U-Pb geochronology of the Moatize and N'Condedzi coalfields in the Zambezi Karoo Basin of Mozambique provides key insights into the regional provenance, sediment dispersal pathways and basin evolution. Borehole cores from the two coalfields reveal a stratigraphy spanning the early Roadian (middle Permian) to the Carnian (Upper Triassic). The Permian sandstones of the Moatize Coalfield (MC) yield...

New insights on the upper triassic silves group in Algarve Basin, Portugal: pal...

This paper presents the results of palynostratigraphic studies in the Silves Group in the Algarve Basin, Portugal. From bottom to top comprises the Silves Sandstones, the Silves Marl-Carbonate Evaporitic Complex, and the Volcano-Sedimentary Series. This study aims to detail the age of the Silves Group, bracketing the Triassic-Jurassic transition, using palynology. For this purpose, 250 samples were collected fr...

Palynology of the Albian–Turonian sediments from the Sumbe region, Kwanza Basin...

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, Palaeohystrichophora infu...

New pollen taxon Syncolpraedapollis angolensis nov. gen. sp. nov.: A noteworthy...

ABSTRACT: A palynostratigraphic study of the upper Cunga and lower Quifangondo deposits in the Cabo de São Brás section, Kwanza Basin, Angola, has revealed a new pollen named Syncolpraedapollis angolensis nov. gen. sp. nov. This finding was part of a wider survey in the upper Cunga and lower Quifangondo deposits of the Cabo de São Brás section, Kwanza Basin, Angola, covering the latest Eocene to the latest Olig...

Palynological assemblages from Hongguleleng Formation of Western Junggar, North...

ABSTRACT: The Upper Devonian Hongguleleng Formation is a significant stratigraphic unit near the Frasnian/Famennian and Devonian/Carboniferous boundaries of the Kazakhstan Paleoplate. However, its age is still under debate. A new palynostratigraphic analysis was conducted at the Gennaren section to provide a more accurate biostratigraphic assignment. In this study, we identified 43 species belonging to 26 spore...

Idade e ambientes deposicionais da sucessão do Karoo Inferior da Bacia Carboníf...

The paleoenvironmental and thermal histories of the permian Irati formation sha...

Mineralogical assemblages and organofacies are important sources of information to recover the paleoenvir-onmental and thermal histories of shale deposits. In this study, a detailed qualitative and quantitative charac-terization of the Permian Irati Formation (Assistencia Member) shale is based on mineralogical (XRD and SEM -EDS) and organic components (TOC, Rock-Eval pyrolysis, organofacies, TAI, fluorescence ...

The upper Hauterivian–Barremian (Lower Cretaceous) Arrifes section (Algarve Bas...

Integrated sedimentological, palynological, and palynofacies analyses of the Arrifes section in the central Algarve Basin (southern Portugal) provided new information on the age and environments of this Lower Cretaceous sequence. The sedimentary succession at the Arrifes section consists of fossiliferous inter-bedded limestones, marly limestones, and marls, dated as latest Hauterivian to late Barremian age (Low...