Abstract Maio Island (Cabo Verde Archipelago) is composed of uplifted Early Mesozoic MORB-type pillow lavas and deep-sea sediments, unconformably overlain intruded by Miocene igneous rocks. Combined structural analyses 40 Ar– 39 Ar dating were used to constrain the evolution Maio. Structures ages sequences crosscutting dykes showed that numerous intrusive events associated with intense growth a...

The fossil biota of the upper Valanginian–lower Hauterivian sediment hosted vent (SHV) environment Zeng?várkony comprises 39 species, 55 genera and higher taxa representing seven phyla. Thirteen these are reported from Zeng?rvárkony as new species or subgenera/genera, this high endemicity is linked to a unique palaeoenvironment. palaeoenvironment developed in an outer shelf epicontinental setti...

The rift section of the Brazilian basins represent sedimentary record associated with first stages Gondwana break-up in Early Cretaceous phase (Berriasian to Aptian). succession Campos Basin constitutes one main petroleum systems Brazil’s marginal basins. This interval contains source rock and important reservoirs Lagoa Feia Group deposits. is characterized by siliciclastic, carbonate evaporite...

Abstract Inversion structures including folds, reverse faults are observed along the Bjørnøyrenna Fault Complex in western Barents Sea, although fault complex is extensional origin and developed mid-Jurassic to Early Cretaceous. Subsidence was interrupted Cretaceous (Valanginian early Barremian) because of syn-rift localized tectonic inversion, itself related uplift Loppa High. The inversion ca...

The main purpose of this study is to estimate hydrocarbon potentialities Yamama Formation (Valanginian–Early Hauterivian) by using assessment technique links up between gamma ray spectrometry logs and other conventional open hole for determining the petrophysical properties units in Subba oil-field oil water contact as well. Lower (YB); considered reservoir unit, aptly composed shallow high dep...

Abstract The Jebel Oust region (north-eastern Tunisia) recorded two levels of marine black shale in the Lower Cretaceous marly series. Geodynamic evolution, biostratigraphic and Rock–Eval analysies allow classifying those shales as unconventional oil resource systems that were deposited during oceanic anoxic events: Middel Barremian Event "MBE" Early Aptian "OAE1a". Paleogeographic evolution hi...

The Cretaceous marine sedimentary record is characterized by time intervals rich in organic matter correlating with positive carbon isotope excursions, often called oceanic anoxic events. Weissert Event corresponds to the first such event during Valanginian stage. associated palaeoenvironmental perturbations, which include increasing surface water primary productivity, are hypothesized have bee...