Sedimentation and shale tectonics of the northwestern Niger Delta front

Cohen, Harvey A.; McClay, Ken

doi:10.1016/0264-8172(95)00067-4

Cited by 152 publications

(106 citation statements)

References 15 publications

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“…1). A large number of seafloor structures related to fluid venting (i.e., mud 120 volcanoes, diapirs, pockmarks) were reported previously on the Niger Delta deep province 121 (Mascle et al, 1973;Brooks et al, 1994;Cohen and McClay, 1996;Bayon et al, 2007;Sultan 122 et al, 2010). In this study, all water and sediment samples were collected from three distinct 123 areas (Fig.…”

Section: Studied Sites 118mentioning

confidence: 88%

Evidence for intense REE scavenging at cold seeps from the Niger Delta margin

Bayon

Birot

Ruffine

et al. 2011

Earth and Planetary Science Letters

126

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International audienceFor many trace elements, continental margins are the location of intense exchange processes between sediment and seawater, which control their distribution in the water column, but have yet to be fully understood. In this study, we have investigated the impact of fluid seepage at cold seeps on the marine cycle of neodymium. We determined dissolved and total dissolvable (TD) concentrations for REE and well-established tracers of fluid seepage (CH4, TDFe, TDMn), and Nd isotopic compositions in seawater samples collected above cold seeps and a reference site (i.e. away from any fluid venting area) from the Niger Delta margin. We also analyzed cold seep authigenic phases and various core-top sediment fractions (pore water, detrital component, easily leachable phases, uncleaned foraminifera) recovered near the hydrocast stations. Methane, TDFe and TDMn concentrations clearly indicate active fluid venting at the studied seeps, with plumes rising up to about 100 m above the seafloor. Depth profiles show pronounced REE enrichments in the non-filtered samples (TD concentrations) within plumes, whereas filtered samples (dissolved concentrations) exhibit slight REE depletion in plumes relative to the overlying water column and display typical seawater REE patterns. These results suggest that the net flux of REE emitted into seawater at cold seeps is controlled by the presence of particulate phases, most probably Fe-Mn oxyhydroxides associated to resuspended sediments. At the reference site, however, our data reveal significant enrichment for dissolved REE in bottom waters, that clearly relates to diffusive benthic fluxes from surface sediments. Neodymium isotopic ratios measured in the water column range from εNd ~−15.7 to − 10.4. Evidence that the εNd values for Antarctic Intermediate waters (AAIW) differed from those reported for the same water mass at open ocean settings shows that sediment/water interactions take place in the Gulf of Guinea. At each site, however, the bottom water εNd signature generally differs from that for cold seep minerals, easily leachable sediment phases, and detrital fractions from local sediments, ruling out the possibility that seepage of methane-rich fluids and sediment dissolution act as a substantial source of dissolved Nd to seawater in the Gulf of Guinea. Taken together, our data hence suggest that co-precipitation of Fe-Mn oxyhydroxide phases in sub-surface sediments leads to quantitative scavenging of dissolved REE at cold seeps, preventing their emission into bottom waters. Most probably, it is likely that diffusion from suboxic surface sediments dominates the exchange processes affecting the marine Nd cycle at the Niger Delta margin

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Section: Studied Sites 118mentioning

confidence: 88%

Evidence for intense REE scavenging at cold seeps from the Niger Delta margin

Bayon

Birot

Ruffine

et al. 2011

Earth and Planetary Science Letters

126

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“…The reservoir units occur as part of the Agbada Formation and comprises of stacked shallow (Cohen and McClay 1996) marine fluvial-deltaic sediments separated by major marine shale units (Poston et al 1981). The sands were deposited in middle to upper shore face, wave-influenced environments.…”

Section: The Geology Of Niger Deltamentioning

confidence: 99%

Reservoir description and characterization of Eni field Offshore Niger Delta, southern Nigeria

Osinowo

Ayorinde

Nwankwo

et al. 2017

J Petrol Explor Prod Technol

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Integration of structural and horizon mapping of 3D seismic volume, petrophysical studies of over sixty (60) wireline logs, stratigraphic analyses, reservoir property modeling and production information have been adopted to study Eni field that has been experiencing production decline with increase in water output. Generated reservoir structural framework and spatial reservoir property distribution have proved useful to guide the optimal placement of proposed wells and also provide information needful for the development of best production plan that would guarantee effective oil drainage from the delineated reservoir compartments.

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“…The geology of Ilorin is made up of Eburnean migmatite complex, Pan African older granite series, and the area is covered by dark sandy or clayey loamy top soils [36]. N4 was collected form Iyuku, which is made up of Cretaceous sandstones of the Lokoja Formation and granitic rocks of the older granite series [37] The Ibadan kaolin (N5) occurs in the MigmatiteGneiss-Quartzite Complex, and the Pan African Granitic Series [38] whereas the Benin kaolin (N6) occurs in the Benin Formation of the Niger Delta, which comprises continental or fluviatile sands, gravels and backswamp deposits [42]. The Bida kaolins (N7) are located in the Agbaja Formation of the Bida Basin, which is made up of oolitic ironstones [39].…”

Section: Geology Of Kaolin Sites From Nigeriamentioning

confidence: 99%

Geochemistry of Selected Kaolins from Cameroon and Nigeria

et al. 2017

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Abstract:The geochemical characteristics of selected kaolins from Cameroon and Nigeria are presented, with an attempt to elucidate on their possible industrial applications by comparing them to world-known kaolin deposits. Major oxides concentrations were subjected to factor analyses in interpreting their relationships. Geochemical indices, including chemical index of alteration (CIA), chemical index of weathering (CIW) and the index of compositional variability (ICV) were computed and plotted on binary and ternary diagrams to determine the intensity of weathering of the kaolins and discriminate their different source rock types. Kaolinite was the major phase, followed by quartz, illite and goethite as minor phases. Minerals in trace phases included smectite, anatase, muscovite, gibbsite, microcline, palygorskite and calcite. Mean abundances of major oxides in wt% were: SiO 2 (56.96)>Al 2 O 3 (24.09)>Fe 2 O 3 (3.78)>TiO 2 (1.53)> K 2 O (1.26)> MgO (0.27)>CaO (0.20)>Na 2 O (0.17)>P 2 O 5 (0.05)>MnO (0.04). The CIW versus CIA and ICV versus CIA plots showed that most of the kaolins clearly depicted extreme silicate weathering. The current applications of kaolins from Cameroon and Nigeria include ceramics and manufacturing of bricks and tiles. Low MgO, CaO, Na 2 O, K 2 O and TiO 2 further position the kaolins for pharmaceutics, cosmetics, rubber and plastic applications. Thus, the studied kaolins have the potential to contribute to improved economic development of these countries.

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Sedimentation and shale tectonics of the northwestern Niger Delta front

Cited by 152 publications

References 15 publications

Evidence for intense REE scavenging at cold seeps from the Niger Delta margin

Evidence for intense REE scavenging at cold seeps from the Niger Delta margin

Reservoir description and characterization of Eni field Offshore Niger Delta, southern Nigeria

Geochemistry of Selected Kaolins from Cameroon and Nigeria

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