Étude de quelques palynomorphes du crétace supérieur du bassin offshore de Côte d'Ivoire: implications biostratigraphiques et paléoenvironnementales

Tea-Yass, Juliette; Digbehi, Zéli Bruno; Yao, Konan Raphael; Glohi, Boblai Victor

doi:10.1016/s0899-5362(99)00129-3

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…Plate tectonic reconstructions indicate that since the Jurassic, southern West Africa has been located in low latitudes (Scotese et al 1999). A humid tropical climate was established at least at Mid-Cretaceous times in the area of the southern Ivory Coast (Tea-Yassi et al 1999). Therefore, we assume that from the Mid-Cretaceous onwards, similar weathering conditions and transport-limited erosion processes (cf.…”

Section: Discussion and Interpretationmentioning

confidence: 99%

Development of the Côte d´Ivoire Basin: reading provenance, sediment dispersal, and geodynamic implications from heavy minerals

Wozazek

Krawinkel

2002

International Journal of Earth Sciences

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The combined approach of conventional and varietal heavy mineral analysis was applied to constrain changes in source rock area, dispersal routes of detritus, and geodynamic setting of the Upper Cretaceous to Neogene Côte d'Ivoire basin. The heavy mineral assemblage of Albian to Turonian sediments reflect a narrow source rock area and short transport distances. A prominent change in the heavy mineral association of Late Cenomanian to Neogene sediments indicates enlargement of source area and longer fluvial transport distances, or longer storage of sediment within the littoral energy fence. The sudden change within the heavy mineral associations marks the transition from the late syn-rift stage to the early passive margin stage of the Southern Atlantic. During Albian to Late Cenomanian time, the basin geometry was mainly controlled by steep slopes and sediments were transported directly to the depocenter. The situation changed in Late Cenomanian time. A small shelf area developed where sediments from different sources were mixed and reworked before deposition. We believe that the W-E direction of the long-shore drift, which transports today huge quantities of near-shore sand, was established at the end of the Paleogene. This resulted from the drifting of southern West Africa across the paleoequator and subsequent change in surface wind directions.

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Section: Discussion and Interpretationmentioning

confidence: 99%

Development of the Côte d´Ivoire Basin: reading provenance, sediment dispersal, and geodynamic implications from heavy minerals

Wozazek

Krawinkel

2002

International Journal of Earth Sciences

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“…Further support is owing to the presence of A. mauthei, which is present along the section and is the dominant species, among other species of the same genus (i.e., Andalusiella spp.). The FO of this species is found within deposits of the Senonian (Riegel & Sarjeant, 1982;Masure et al 1996), but its OC is in the Campanian-Maastrichtian interval (Masure et al 1998;Tea-Yassi et al 1999;Yepes 2001).…”

Section: Biostratigraphymentioning

confidence: 97%

Reconstruction of the last cretaceous anoxic event in the Tarfaya Laayoune basin (South of Morocco): Biostratigraphy and Paleoenvironment of the Oum Debaa Formation

Bouwafoud

Benbouziane

Hssaïda

et al. 2021

Acta Musei Silesiae, Scientiae Naturales

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The Tarfaya-Laayoune coastal basin developed in a stable passive margin, where sedimentation occurred in shallow bays. During the Late Cretaceous, bituminous and phosphatic series were deposited in the shallow depression such as Sebkha Oum Debaa. In this work, the age of these Cretaceous layers are refined using a palynological approach and their paleoenvironments are described using organic geochemistry. Based on quantitative and qualitative palynological analyses, the sediments revealed a rich and diverse dinoflagellate cyst assemblage (65 taxa); among them 9 important biostratigraphic markers: Andalusiella inflata, Andalusiella ivoirensis, Andalusiella mauthei, Cerodinium diebelii, Cerodinium speciosum, Dinogymnium acuminatum, Odontochitina porifera, Trichodinium castanea, and Trithyrodinium evittii. According to the reported stratigraphic dinoflagellate taxa distribution, an age range of late Campanian to early Maastrichtian is herein proposed for the Oum Debaa Formation. This biostratigraphy update has been correlated to the Tethyan and Sub-Boreal domains. On the paleoenvironmental level, geochemical proxies have displayed an anoxic lagoon depositional which is dominated by an intermediate climate between hot / humid and arid with an often low paleoproductivity regime which induces redox conditions.

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“…This portion of the basin (onshore) is very narrow in the west, but it widens to 35 kilometers at the level of Abidjan level. A large fault, known as the "lagoon fault", runs through the basin from west to east, dividing it into two parts: To the north, the fault's formations are finer, made up of clays, clayey soils, and more or less ferruginous sandstones of "terminal continental" age [21,22]. The outcropping rocks in the south are thicker, and they are dominated by quaternary deposits made up of white sands and continental clayey beaches, sandy cordons, sands, fluvio-lagunar argillites, and maritime sands.…”

Section: Geological Contextmentioning

confidence: 99%

Monitoring Spatial and Temporal Scales of Shoreline Changes in Lahou-Kpanda (Southern Ivory Coast) Using Landsat Data Series (TM, ETM+ and OLI)

Zonkouan

Bachri²,

Beda

et al. 2021

GaEE

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Shoreline changes are crucial for assessing human-ecosystem interactions in coastal environments. They are a valuable tool for determining the environmental costs of socioeconomic growth along coasts. In this research, we present an assessment of shoreline changes along the eastern coast of Lahou-Kpanda of the Ivory Coast during the period from 1980 to 2020 by applying Digital Shoreline Analysis System method using Landsat Data Series. The measurement of the shoreline dynamics of the Lahou-Kpanda coastline is mainly described in three parts: the west straight cordon, the dynamics at the mouth and the east straight cordon. The findings show a drastic reduction in natural shorelines. The greatest transition occurred along the mouth segment of the coast, where the average erosive velocity approaches 90 meters each year and the average distance has decreased by around 2 kilometers. The Ivory Coast lost more than 40% of its biological shorelines between 1980 and 2020, according to this report, a worrying development because these are regions that were once biologically abundant and highly rich. In general, human operations on the Ivory Coast’s shorelines have never had such an impact. The effects of these changes on habitats, as well as the vulnerability of new shoreline investments to increased human activity and sea-level rise, must be measured.

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Étude de quelques palynomorphes du crétace supérieur du bassin offshore de Côte d'Ivoire: implications biostratigraphiques et paléoenvironnementales

Cited by 9 publications

References 6 publications

Development of the Côte d´Ivoire Basin: reading provenance, sediment dispersal, and geodynamic implications from heavy minerals

Development of the Côte d´Ivoire Basin: reading provenance, sediment dispersal, and geodynamic implications from heavy minerals

Reconstruction of the last cretaceous anoxic event in the Tarfaya Laayoune basin (South of Morocco): Biostratigraphy and Paleoenvironment of the Oum Debaa Formation

Monitoring Spatial and Temporal Scales of Shoreline Changes in Lahou-Kpanda (Southern Ivory Coast) Using Landsat Data Series (TM, ETM+ and OLI)

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