Stratigraphy, sedimentology and diagenetic evolution of the Lapur Sandstone in northern Kenya: Implications for oil exploration of the Meso-Cenozoic Turkana depression

Tiercelin, Jean-Jacques; Potdevin, Jean-Luc; Thuo, Peter; Abdelfettah, Yassine; Schuster, Mathieu; Bourquin, Sylvie; Bellón, Hervé; Clément, Jean-Philippe; Guillou, Hervé; Nalpas, Thierry; Ruffet, Gilles

doi:10.1016/j.jafrearsci.2012.06.007

Cited by 26 publications

(39 citation statements)

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“…Chapman and Brook, 1978;Hautot et al, 2000;Tiercelin et al, 2012) overlapped by volcanics (Elgayo and Samburu basalt, Uasin-Gishu, Sidekh and Tim phonolites) onlapping both sides of the previous early sedimentary basin with a clear flexural pattern (Baker, 1987;Chapman and Brook, 1978;Hautot et al, 2000;Mugisha et al, 1997). This period is also coeval with the first occurrence of volcanism (Kishalduga nephelinites; ≈ 16 Ma) in southern Kenya, in the area of the Upper Miocene Gregory Rift (Crossley, 1979;Crossley and Knight, 1981).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 89%

Deformation and sedimentary evolution of the Lake Albert Rift (Uganda, East African Rift System)

Simon

Guillocheau

Robin

et al. 2017

Marine and Petroleum Geology

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This study proposed a new reconstruction of the tectono-sedimentary evolution of the Lake Albert Rift based on a biostratigraphical, sedimentological and structural re-evaluation of the outcropping data and on an exceptional subsurface dataset.The infilling of the rift consists of lacustrine deposits wherein two major unconformities dated at 6.2 Ma and 2.7 Ma were characterized, coeval with major subsidence and climatic changes.Combined with the fault analysis, the evolution and distribution of the subsidence highlights a foursteps evolution of the rift after its initiation dated at 17.0 Ma.The first phase (17.0 -6.2 Ma) consists of low and diffuse extension associated with low accommodation rates ranging from 150 to 200 m/Ma. Restricted in the southern part of the basin, the depocenter location is poorly controlled by faults, meaning that the basin extension was potentially larger at this time.The second time interval (6.2 -2.7 Ma) shows an increase of accommodation rates with values reaching more than 800 m/Ma. These high rates combined with the location of the major depocenters down the bounding faults argue for a first true rifting phase.Between 2.7 Ma and 0.4 Ma, the accommodation rates decreases to reach less than 400 m/Ma and the individualization of major depocenters continue down the major fault in the southern, and northwestern parts of the basin.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 89%

Deformation and sedimentary evolution of the Lake Albert Rift (Uganda, East African Rift System)

Simon

Guillocheau

Robin

et al. 2017

Marine and Petroleum Geology

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“…Madagascar and India rifted from East Africa, leaving in their wake the Somali Basin and the Cretaceous Anza Graben ( fig. 1), an aulacogen extending inland from the coast toward southern Sudan (Tiercelin et al, 2012;Werner, 1994). The final phase in forming the outline of the African continent was the Cretaceous opening of the South Atlantic, producing the iconic puzzle-like fit of the African and South American coastlines ( fig.…”

Section: The Mesozoic Formation Of Africa and The General Distributiomentioning

confidence: 99%

Post-Gondwana Africa and the vertebrate history of the Angolan Atlantic Coast

Jacobs¹,

Polcyn²,

Mateus³

et al. 2016

MMV

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“…Above this basement, both sedimentary and volcanic rocks are grouped into several formations (Figure ). The oldest sedimentary rocks, the Turkana Grits Fm, consist of hundreds of metres‐thick fluvial sandstones deposited between the Late Cretaceous and the Oligocene, and they are found in both the southern and northern portions of the Turkana Depression (Arambourg & Wolff, ; Morley et al, ; Muia, ; Thuo, ; Tiercelin et al, ; Tiercelin, Potdevin, et al, ; Tiercelin, Thuo, et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Evolution of the northern Turkana Depression (East African Rift System, Kenya) during the Cenozoic rifting: New insights from the Ekitale Basin (28‐25.5 Ma)

et al. 2018

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Two sedimentary basins are identified in the Turkana Depression (East African Rift System, Kenya). One of them, the Ekitale Basin, is presented in detail. Located on the western rift shoulder of the northern Turkana Depression, the preserved portion of the Ekitale Basin is 3–5‐km wide and bordered by N40°–50° normal faults. These normal faults were inherited from the reactivation of pre‐existing basement structures. The Ekitale Basin is filled by the ~75‐m‐thick Topernawi Formation. The lower portion of the formation provides evidence that the basin was occupied by a lake, bordered by alluvial fans, and into which river‐derived turbiditic complexes were deposited. The upper portion is comprised of pyroclastic deposits, originating from volcanic activity, and interbedded with fluvial deposits emplaced during periods of volcanic quiescence. The Ekitale Basin opened just after 28 Ma and was abandoned prior to 25 Ma, placing it after the deposition of the Oligocene Traps (ca. 33.9–27 Ma) and prior to the rift climax (after 14 Ma). This syn‐rift basin largely impacts our understanding of the Cenozoic rift evolution in the Turkana Depression. It helps to identify, for the first time, the first pulse of extension of the Cenozoic rifting, revealing a two‐step rifting scenario for the northern Turkana Depression. The Ekitale Basin, and analogous syn‐rift basins, is believed to have developed from the reactivation of pre‐existing structures during a period of extension marked by low differential stress and a low amount of extension.

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Stratigraphy, sedimentology and diagenetic evolution of the Lapur Sandstone in northern Kenya: Implications for oil exploration of the Meso-Cenozoic Turkana depression

Cited by 26 publications

References 105 publications

Deformation and sedimentary evolution of the Lake Albert Rift (Uganda, East African Rift System)

Deformation and sedimentary evolution of the Lake Albert Rift (Uganda, East African Rift System)

Post-Gondwana Africa and the vertebrate history of the Angolan Atlantic Coast

Evolution of the northern Turkana Depression (East African Rift System, Kenya) during the Cenozoic rifting: New insights from the Ekitale Basin (28‐25.5 Ma)

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