The tectonic style of the atlantic mesozoic rift system

Uchupi, E.

doi:10.1016/s0899-5362(89)80021-1

Cited by 54 publications

(30 citation statements)

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“…By late Cretaceous, the Gondwana break-up had stopped in almost all areas and post-rift thermotectonic subsidence and minimal faulting dominated the basin development from there on (Vayssaire et al, 2007). This study confirms that the basin underwent two phases of thermal subsidence resulting in distinct variations of the post-rift successions, which also correspond to the observations made by different authors (Galeazzi, 1998;Hinz et al, 1999;Uchupi, 1989;Sibuet et al, 1984) (Fig. 13).…”

Section: Accepted M Manuscriptsupporting

confidence: 91%

“…The Argentine passive margin is mainly of the volcanic rifted type resulting from the breakup of Gondwana and the northward-propagating opening of the South Atlantic (Gladczenko et al, 1997;Hinz et al, 1999;Rabinowitz and Labreque, 1979;Sibuet et al, 1984;Uchupi, 1989;Uliana and Biddle, 1987;Franke et al, 2007;2010). The Colorado Basin records the development of the Lower Cretaceous to present-day volcanic-rifted passive margin of Argentina.…”

Section: Geological and Tectonic Settingmentioning

confidence: 99%

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Tectonic evolution of the Colorado Basin, offshore Argentina, inferred from seismo-stratigraphy and depositional rates analysis

et al. 2013

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(2013): Tectonic evolution of the Colorado Basin, offshore Argentina, inferred from seismo-stratigraphy and depositional rates analysis. -Tectonophysics, 604, 245-263 DOI: 10.1016/j.tecto.2013 A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractBased on a dense 2D seismic reflection dataset and 8 exploration wells, we reinterpreted the geological evolution of the Colorado Basin. The basin is located on the continental shelf and slope within 50 to 2250 m of bathymetry. The total sediment fill can be up to 16,000 m.Seismic-to-well log correlations provide a chrono-stratigraphic framework for the interpreted

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Section: Accepted M Manuscriptsupporting

confidence: 91%

Section: Geological and Tectonic Settingmentioning

confidence: 99%

Tectonic evolution of the Colorado Basin, offshore Argentina, inferred from seismo-stratigraphy and depositional rates analysis

et al. 2013

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“…Regardless of the timing of this phase of rift initiation, there is a consensus that the Pan-African fabrics played an important role in the subsequent South Atlantic rift phase along the margin (e.g. Uchupi 1989;Maslanyi et al 1992). A significant rift onset unconformity has been identified in a number of previous seismic reflection studies (e.g.…”

Section: Regional Settingmentioning

confidence: 99%

Interaction of crustal heterogeneity and lithospheric processes in determining passive margin architecture on the southern Namibian margin

Mohammed

Paton

Collier

et al. 2016

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Abstract:The influence of pre-rift crustal heterogeneity and structure upon the evolution of a continental rift and its subsequent passive margin is explored. The absence of thick Aptian salts in the Namibian South Atlantic allows imaging of sufficient resolution to distinguish different pre-rift basement seismic facies. Aspects of pre-rift basement geometry have been characterized which are then compared with the geometries of Cretaceous rift basin structure, and of subsequent post-rift margin architectural elements. Half-graben depocentres migrate westward within the continental syn-rift phase, at the same time as basin bounding faults become established as hard-linked arrays with lengths of approximately 100 km. The rift-drift transition phase, marked by Seaward Dipping Reflectors, gives way to the early post-rift progradation of clastics off the Namibian coast. In the Late Cretaceous, these shelf clastics are much thicker in the south, reflecting the dominance of the newly formed Orange River catchment as the main sediment entry point on the South African/Namibian margin. Tertiary clastics largely bypass the pre-existing shelf area, revealing a marked basinwards shift in sedimentation. Post-rift megasequence thicknesses do not vary simply according to the location of syn-rift half-grabens and thinned continental crust. Rather, the Namibian margin exemplifies margins influenced by a complex interplay of crustal thinning, pre-rift basement heterogeneity, volcanic bodies and transient dynamic uplift events on the evolution of lithospheric strain and depositional architectures.

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Section: 1 Introductionmentioning

confidence: 99%

“…Teisserenc and Villemin, 1989; Séranne et al, 1992;Rasmussen, 1996;Uenzelmann-Neben et al, 1997;Anderson et al, 2000; Lavier et al, 2000;Marton et al, 2000;Mougamba et al, 2000;Lucazeau et al, 2003). A few limited regional studies have provided some hints on the distal part of the fan and an idea of the size of the deep fan (Emery et al, 1975a;Uchupi, 1989Uchupi, , 1992.However, the most recent and extensive study of the area was conducted from 1998 to 2005 within a partnership research project built by Ifremer and TOTAL, the ZaïAngo project, which involved a French multidisciplinary team including geologists, sedimentologists, geochemists, geotechnical engineers and geophysicists..2 The ZaïAngo project . …”

mentioning

confidence: 99%

Geological overview of the Angola–Congo margin, the Congo deep-sea fan and its submarine valleys

Savoye

Babonneau

Dennielou

et al. 2009

Deep Sea Research Part II: Topical Studies in Oceanography

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155

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The Congo deep-sea fan is one of the largest fans in the world still affected by presently active turbidity currents. The present activity of deep-sea sedimentary processes is linked to the existence of a direct connection between the Congo River estuary and the Congo canyon head that allows relatively continuous sediment feeding of the deep-sea environment, in spite of a wide continental shelf (150 km). Because of this important activity in terms of sedimentary processes, the deep-sea environment of the Congo-Angola margin presents major interests concerning physical, chemical and biological studies near the sea floor. The main aim of this paper is to present the initial geological context of the BioZaire Program, showing a synthesis of the major results of the ZaïAngo Project including (1) the brief geological setting of the Congo-Angola margin, (2) the structure of the modern Congo deep-sea fan, (3) the sedimentary architecture of the recent Congo turbidite system (from the canyon to the distal lobes), and (4) the recent and present turbidite sedimentation. In order to provide useful information and advice relevant to biological and geochemical studies across the Congo sedimentary system, this article focuses on the present sedimentary processes and the present activity of turbidity current along the Congo canyon and channel.Keywords : Congo-Angola margin, Congo channel, sedimentary deposits, turbidite .1 IntroductionThe accumulation of marine sediment seaward of the Congo River estuary is probably one of the greatest in the world for a submarine system that is still active today. In the continental domain, the Congo sedimentary system is composed by a wide drainage basin, the river and its tributaries. In the nearshore and marine domain: it consists of the estuary, the canyon, which acts mainly as a by-pass zone, and finally an area of preferential sedimentation at the foot of the continental slope and in the deep basin. The Congo submarine system has been geologically studied since Buchanan in 1887 (submarine cable survey) and was the focus of the ZaïAngo project team from 1998 to 2005. Several types of evidence of Holocene and very recent activity in the canyon have been described and linked to sedimentary processes such as turbidity currents, river floods, slides, gas hydrate formation and fluid escape. The aim of this paper is to synthesize the geological knowledge of the area and in particular the results of the ZaïAngo project in order to provide useful information and advice relevant to biological and geochemical studies across the Congo sedimentary system. Marine biologists and oceanographers are usually not familiar with turbidite deposits. These sedimentary deposits were first recognised and described in outcrops of ancient sedimentary series (Bouma, 1962;Walker, 1978;Mutti, 1992). They are generated by submarine gravity processes and they build large sedimentary systems in deep-water environments, termed deep-sea fans. Deep-sea fans are well developed from the foot of the continental slope...

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The tectonic style of the atlantic mesozoic rift system

Cited by 54 publications

References 45 publications

Tectonic evolution of the Colorado Basin, offshore Argentina, inferred from seismo-stratigraphy and depositional rates analysis

Tectonic evolution of the Colorado Basin, offshore Argentina, inferred from seismo-stratigraphy and depositional rates analysis

Interaction of crustal heterogeneity and lithospheric processes in determining passive margin architecture on the southern Namibian margin

Geological overview of the Angola–Congo margin, the Congo deep-sea fan and its submarine valleys

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