Cenozoic volcanism in Western Senegal and its relationship to the opening of the Central Atlantic Ocean

Lo, Papa Goumbo; Dia, Anta Tal; Kampunzu, A.B.

doi:10.1016/0040-1951(92)90035-5

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…The Cap-Vert peninsula volcanism is previously interpreted as anintra-plate volcanism associated with the migration of hot spot activities [9] [10]. On the basis of K-Ar ages data, the Cap-Vert peninsula volcanism is contemporary to the Cape Verde and Canary archipelagoes volcanism by their ages of their manifestations and their geodynamic significance [6].…”

Section: Discussionmentioning

confidence: 99%

The Geodynamic Context of the Cenozoic Volcanism of the Cap-Vert Peninsula (Senegal)

Ndiaye¹,

Ngom²

2014

IJG

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The Cenozoic alkaline volcanism of the Senegalo-Mauritania sedimentary basin presents an episodic long-lasting volcanic activity from the Eocene-Oligocene boundary up to the Quaternary. Two volcanic episodes are usually distinguished on stratigraphical grounds: a Miocene one and a Quaternary one separated by a period of quiescence of several million years corresponding to the main phase of lateritic weathering. The Tertiary lavas are highly silica-undersaturated alkaline rocks ranging from nephelinites to basanites. They contain nepheline and fassaite-type clinopyroxene in their mineralogy. The Quaternary lavas are more evolved with Hy-normative in comparison to the Tertiary ones; they are composed of basanites and medium to coarser-grained dolerites. The distribution of the REE and other incompatible elements are typical of alkaline lavas with generally strong LREE enrichment without significant Eu anomaly. The Cenozoic Cap-Vert lavas have OIB (oceanic islands basalts)-affinities as shown by their relatively radiogenic Nd and unradiogenic Sr characters closed to the HIMU-OIB. This suggests a HIMU-type end member in the magma sources which is fairly comparable to those erupted in the Canaries and Cape Verde archipelagoes during the same period.

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Section: Discussionmentioning

confidence: 99%

The Geodynamic Context of the Cenozoic Volcanism of the Cap-Vert Peninsula (Senegal)

Ndiaye¹,

Ngom²

2014

IJG

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“…An important magmatic event occurred in the Cape Vert Peninsula and the Theis Plateau to the east of Dakar from Miocene (35 Ma) to Pleistocene (0.8 Ma) (Goumbo Lo et al, 1992). This probably succeeds pulses of magmatism in the area during the early Cretaceous and late Cretaceous.…”

Section: Stratigraphymentioning

confidence: 98%

“…This probably succeeds pulses of magmatism in the area during the early Cretaceous and late Cretaceous. The age of the Cayar Sea Mount is probably midCretaceous, as Maastrichtian sands sit unconformably on metamorphosed Lower Cretaceous carbonates above the intrusion (Goumbo Lo et al, 1992).…”

Section: Stratigraphymentioning

confidence: 99%

Central Atlantic margin basins of North West Africa: Geology and hydrocarbon potential (Morocco to Guinea)

Davison¹

2005

Journal of African Earth Sciences

162

115

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“…The Miocene igneous products are found as rare large dykes and sills, and as thick, columnar jointed layers that cannot unambiguously be defined as subaerial lava flows or sills, owing to the lack of exposure of both their bottom and top surfaces. All the Oligocene-Miocene products are mostly aphanitic, with sodic-alkaline, olivine nephelinite to basanite compositions (Loˆet al, 1992) and have magnetic susceptibility values up to 8300 · 10 )5 SI units; in contrast, outcropping sedimentary rocks have susceptibilities close to the instrumental detection limit. In the Quaternary section, phreatomagmatic products commonly occur, along with strombolian scorias and lava flows (Bellion and Crevola, 1991).…”

Section: Field Observationsmentioning

confidence: 99%

Detection of Miocene saucer‐shaped sills (offshore Senegal) via integrated interpretation of seismic, magnetic and gravity data

et al. 2007

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The Atlantic margin offshore Senegal has been explored by seismic reflection and GRAV-MAG surveys. High-amplitude, laterally transgressive seismic reflectors are found to coincide with gravimetric and magnetic highs. Once seismic data are integrated with potential fields modelling, these reflectors can be safely interpreted as saucer-shaped igneous sills, up to some hundreds of metres thick, some km wide. The occurrence of hydrothermal vent complexes and forced folds in the stratigraphic sequence above the sills constrain the intrusion age to the Miocene. Field observations and in-situ magnetic susceptibility measurements of Oligocene–Miocene and Quaternary igneous rocks emplaced in coastal Senegal support this interpretation

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Cenozoic volcanism in Western Senegal and its relationship to the opening of the Central Atlantic Ocean

Cited by 12 publications

References 12 publications

The Geodynamic Context of the Cenozoic Volcanism of the Cap-Vert Peninsula (Senegal)

The Geodynamic Context of the Cenozoic Volcanism of the Cap-Vert Peninsula (Senegal)

Central Atlantic margin basins of North West Africa: Geology and hydrocarbon potential (Morocco to Guinea)

Detection of Miocene saucer‐shaped sills (offshore Senegal) via integrated interpretation of seismic, magnetic and gravity data

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