Oil and Geology in Cuanza Basin of Angola

R., None Georges P. Brognon (2), Georges

doi:10.1306/5d25b471-16c1-11d7-8645000102c1865d

Cited by 19 publications

(3 citation statements)

References 3 publications

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“…The thickness is very variable, estimated at ~300 m at the basin scale (Ala and Selley, 1997) but can reach locally 1000 m (Lhener andDe Ruiter, 1977, Brice et al, 1982). This Aptian salt episode marks the transition between the rifting phase and the subsequent thermal subsidence due to lithosphere cooling following the breakup and oceanic accretion (Brognon andVerrier 1966, Cainelli andMohriak 1999).…”

Section: Geology Of the Offshore Lower Congo Basinmentioning

confidence: 99%

Depicting past stress history at passive margins: A combination of calcite twinning and stylolite roughness paleopiezometry in supra-salt Sendji deep carbonates, Lower Congo Basin, west Africa

Zeboudj

Bah

Lacombe

et al. 2023

Marine and Petroleum Geology

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Section: Geology Of the Offshore Lower Congo Basinmentioning

confidence: 99%

Depicting past stress history at passive margins: A combination of calcite twinning and stylolite roughness paleopiezometry in supra-salt Sendji deep carbonates, Lower Congo Basin, west Africa

Zeboudj

Bah

Lacombe

et al. 2023

Marine and Petroleum Geology

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“…The Central Segment basins include evaporitic deposits in the upper part of the transition packages (e.g. Brognon & Verrier, 1966; Lehner & de Ruiter, 1977; Mohriak, Mello, et al, 1990; Ojeda, 1982; Pautot et al, 1973; Figure 2b). They have been deposited, at the scale of the Central Segment, within few Myrs in the Aptian (e.g.…”

Section: The South and Equatorial Atlantic Oceansmentioning

confidence: 99%

Meta‐analysis of the long‐term stratigraphic evolution of rifted margin basins: The GeoDyNamical Analysis approach applied to the South Atlantic Ocean

et al. 2022

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Models of the formation of rifted margins have significantly evolved over the last decades by identifying new styles of crustal thinning and magmatic production. However, the expression of these different processes in the depositional environments of the overlying basins remains to be determined. Using only published data, we integrated the sedimentary evolution of 21 basins of the Equatorial, Central and South segments of the South Atlantic that record various styles of crustal thinning and magmatic production. To compare these basins that underwent rifting at different times, we developed a new type of analysis allowing to evaluate statistically the (dis)similarities in depositional environment trends by normalizing them to the tectonic phases of the basin (syn‐rift, transition and post‐rift) rather than the stratigraphic or absolute ages: The GeoDyNamical Analysis. We show that the timing of the long‐term retrograding mega‐sequence driven by lithosphere thinning depends on the deformation style and magma production. Along oblique margins of the Equatorial Segment, deepening initiated during syn‐rift because their narrow crustal thinning style favours rapid tectonic subsidence surpassing sediment supply. Along wide margins of the Central Segment, deepening is initiated later, at the end of the transition phase, because depth‐dependent thinning favours slow tectonic subsidence and late break‐up. Along magma‐rich margins of the South Segment, deepening is initiated during the transition phase, after volcanics stopped filling accommodation created by subsidence. In the Central Segment, evaporites accumulated during the second half of the transition phase, when crustal thinning ceased in the proximal margin and migrated to its distal part. Immediately before and during evaporites accumulation, sediments recorded continental and coastal depositional environments resulting from the limited thermal subsidence in the proximal margin domain. Evaporite deposition lasted until the initiation of retrograding mega‐sequence, at the onset of the post‐rift phase and the end of crustal thinning in the distal margin.

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“…The wide rifted margins of the central South Atlantic exhibit a giant evaporite basin that extends from onshore to the distal margin next to the oceanic crust and from the Ascension fracture zone in the north and the Rio Grande fracture zone in the south (Figure 1) (e.g., Brognon & Verrier, 1966; Karner & Gambôa, 2007; Kukla et al., 2018; Moulin et al., 2010; Pichel et al., 2023). The conjugate margins formed during breakup of the Pangaea super‐continent in the Early Cretaceous (∼145–115 Ma) (e.g., R. Guiraud & Maurin, 1991) and a very thick evaporite basin formed during the late syn‐rift and early post‐rift (e.g., Karner & Gambôa, 2007).…”

Section: Introductionmentioning

confidence: 99%

2‐D Geodynamic Modeling of the Central South Atlantic Wide Rifted Margins, Implications for Evaporite Deposition

Theunissen,

Huismans,

Rouby

et al. 2024

JGR Solid Earth

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The thick late syn‐ to early post‐rift shallow water evaporites in the most distal part of wide rifted margins is paradoxical with the deep depression at crustal breakup time predicted by isostatically compensated lithospheric thinning. Elevation of the distal margin and water depth during deposition of the late syn‐rift evaporites in the central South Atlantic are not well constrained and remain to be quantified. We use forward 2‐D thermo‐mechanical modeling coupled with melt prediction and surface processes to assess the contribution of lithospheric and mantle processes on the distal margin topography and subsidence history during continental rifting. Models show that (a) counter‐flow of depleted lower lithospheric mantle during rifting explains the magma‐poor nature of these margins and (b) weak crust and syn‐rift sediment control the wide crustal necking and subsidence history of the distal margin. Integration of our modeling results with quantified geophysical and geological observations suggests that (a) base level was down to −600 m below present‐day global sea level (bsl) during distal margin formation in the Aptian before sag and evaporite deposition, (b) base level was about −300/−400 m bsl at the end of evaporite deposition, and (c) scenarios with a fixed shallow base level (−400 m bsl) or with an increasing base level from an initially deep position (−1,600 m bsl) during evaporite deposition can both fit the observed evaporite distribution. However, erosional features along the base of evaporites suggest a deep initial base level.

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Oil and Geology in Cuanza Basin of Angola

Cited by 19 publications

References 3 publications

Depicting past stress history at passive margins: A combination of calcite twinning and stylolite roughness paleopiezometry in supra-salt Sendji deep carbonates, Lower Congo Basin, west Africa

Depicting past stress history at passive margins: A combination of calcite twinning and stylolite roughness paleopiezometry in supra-salt Sendji deep carbonates, Lower Congo Basin, west Africa

Meta‐analysis of the long‐term stratigraphic evolution of rifted margin basins: The GeoDyNamical Analysis approach applied to the South Atlantic Ocean

2‐D Geodynamic Modeling of the Central South Atlantic Wide Rifted Margins, Implications for Evaporite Deposition

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