The Lower Cretaceous (Pre-Salt) lithostratigraphy of the Kwanza Basin, Angola

Bate, Raymond Holmes; Cameron, Nicholas; Brandão, Mario G. P.

doi:10.1127/nos/38/2001/117

Cited by 21 publications

(31 citation statements)

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“…15. Correlation of the Cretaceous sedimentary sequences of the North and South Gabon (both modified from Teisserenc and Villemin, 1989;Grosdidier et al, 1996), Cabinda (modified from McHargue, 1990), Congo (modified from Grosdidier et al, 1996) and Kwanza (modified from Bate et al, 2001) basins with the biostratigraphic zonation outlined by Grosdidier et al (1996), Bate (1999) and Bate et al (2001). preserved pockets of virtually monospecific ostracods.…”

Section: Western African Basinsmentioning

confidence: 97%

“…Below the Pattersoncypris layers, sediments dominated by species of Hourcqia were found to be present. Based on the presence of Hourcqia between layers containing monospecific (or at least monogeneric) assemblages in both western African basins (Grosdidier et al, 1996;Bate, 1999;Bate et al, 2001) and the Campos Basin (Moura and Praça, 1985;Moura, 1987Moura, , 1988, it is clear that the "Cytheridea" spp. gr.…”

Section: Western African Basinsmentioning

confidence: 98%

“…The stratigraphic chart presented in Fig. 15 is little modified from that presented by Grosdidier et al (1996) or Bate (1999), though additional information from Bate et al (2001) and Teisserenc and Villemin, (1989) was incorporated during its production.…”

Section: Western African Basinsmentioning

confidence: 99%

“…The most recent work incorporating data concerning the ostracods of offshore western Africa is the formal Pre-Salt lithostratigraphic nomenclature for the Kwanza Basin of Angola published by Bate et al in 2001. These authors identified three formations of interest to this review: the Cuvo Formation, an ostracod-poor formation lying between the Kwanza salt layer (Loeme) and sediments containing ostracods from the AS12 Zone; the Aguia Formation, a delta sand sequence occurring in the north and south of the basin and containing ostracods from zones AS10-AS12; and the Falcão Formation, a limestone layer spanning the AS5-AS12 zones (interfingering with the Aguia) (Bate et al, 2001).…”

Section: Western African Basinsmentioning

confidence: 99%

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Early Cretaceous ostracod biostratigraphy of eastern Brazil and western Africa: An overview

Poropat

Colin

2012

Gondwana Research

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Section: Western African Basinsmentioning

confidence: 97%

Section: Western African Basinsmentioning

confidence: 98%

Section: Western African Basinsmentioning

confidence: 99%

Section: Western African Basinsmentioning

confidence: 99%

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Early Cretaceous ostracod biostratigraphy of eastern Brazil and western Africa: An overview

Poropat

Colin

2012

Gondwana Research

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“…Rift basins of the West and Central African rift system opened under the influence of NE-SW-oriented extensional palaeostresses (West Africa: Benue, Douala, Rio Muni, Gabon, Congo, Angola; Brazil: Sergipe-Alagoas, Campos, Santos) and became part of the South Atlantic coastal rift system (Reyre, 1984;Matos, 1992;Mascle et al, 1993;Maurin and Guiraud, 1993). On the basis of biostratigraphic data, including palynomorphs and non-marine ostracods, Braccini et al (1997) and Bate et al (2001) assign the active rift sequence of the Kwanza and Cabinda areas (North Angola) to the Neocomian and Barremian (interval of approximately 18 Ma). However, 130-133 Ma Hauterivian volcanics underly the rift section in the Brazilian conjugate Campos and Santos rifts (Chang et al, 1992).…”

Section: Precambrian Basementmentioning

confidence: 97%

Segmentation and differential post-rift uplift at the Angola margin as recorded by the transform-rifted Benguela and oblique-to-orthogonal-rifted Kwanza basins

Guiraud¹,

Buta-Neto²,

Quesne³

2010

Marine and Petroleum Geology

116

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Diversity and origin of quartz cements in continental carbonates: Example from the Lower Cretaceous rift deposits of the South Atlantic margin

Teboul

Durlet

Girard

et al. 2019

Applied Geochemistry

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Silica precipitation in continental carbonates is a common process occurring during sedimentation and diagenesis. The Lower Cretaceous rift deposits of the South Atlantic equatorial margin, which are intensively explored by petroleum companies, provide good examples of such silicifications in carbonates, exhibiting a wide diversity of petrographic habit of early to late quartz cements. In order to understand the palaeoenvironmental and diagenetic conditions leading to this diversity, we integrated detailed petrography of diagenetic sequences and quartz habit with δ 18 O quartz measurements (by SIMS) of individual cements observed in samples from the offshore and onshore basins of the West African margin. The petrographic description highlights the omnipresence of early fibrous microquartz cements exhibiting either length-fast or length-slow habit, in addition to laminated microquartz and micro-or mega-quartz forms. Amongst the isotopic analysis, the δ 18 O quartz data show that length-slow cements are generally strongly enriched in 18 O (δ 18 O quartz ranging from 31 to 37‰ SMOW), whereas length-fast forms show less elevated values ACCEPTED MANUSCRIPT 2 (<32‰ SMOW). The highest δ 18 O quartz values for fibrous microquartz are interpreted to reflect precipitation from evaporated meteoric fluids at temperatures >25°C and <100°C. The alkalinity required to favor the precipitation of length-slow fibrous microquartz cements is probably related to fluid/rock interactions with underlying mantel-related or basic volcanic rocks. Such interactions would be in agreement with the recent geodynamic models of the South Atlantic passive margin. The length-fast fibrous microquartz associated with δ 18 O quartz values ranging from 27 to 32‰ SMOW, probably reflect precipitation from moderately to non evaporated, fairly neutral to acid, fluids. The partial dissolution of carbonate cements prior to quartz cementations represents the signature of those acidic conditions. We therefore suggest that acidic pH was obtained through fluid/rock interactions with the intermediate to acid volcanic rocks encountered along the palaeohydrological pathway. Other quartz phases, such as the megaquartz cement, exhibit highly variable δ 18 O quartz values ranging from 20 to 40 ‰. This variation may reflect significant variation in temperature conditions (between 100 and 200°C) or changes in fluid δ 18 O at the small scale. For these populations of non-fibrous quartz cement, the very high δ 18 O quartz values may reflect a contribution of fluids that have either suffered strong evaporation or strong water/rock interaction.

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The Lower Cretaceous (Pre-Salt) lithostratigraphy of the Kwanza Basin, Angola

Cited by 21 publications

References 0 publications

Early Cretaceous ostracod biostratigraphy of eastern Brazil and western Africa: An overview

Early Cretaceous ostracod biostratigraphy of eastern Brazil and western Africa: An overview

Segmentation and differential post-rift uplift at the Angola margin as recorded by the transform-rifted Benguela and oblique-to-orthogonal-rifted Kwanza basins

Diversity and origin of quartz cements in continental carbonates: Example from the Lower Cretaceous rift deposits of the South Atlantic margin

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