The Congo Basin: Subsurface structure interpreted using potential field data and constrained by seismic data

Maddaloni, Francesca; Braitenberg, Carla; Kaban, Mikhail K.; Tesauro, Magdala; Delvaux, Damien

doi:10.1016/j.gloplacha.2021.103611

“…The interpolated maps (Fig. 5a, b), show the internal structure of the basin, with a WNW-ESE structural high separating the CB into two parts (the Kiri High), coinciding with the axial magnetic zone (Kadima et al, 2011a;Maddaloni et al, 2020). Two main depocenters were identified, that motivated the drilling of the Samba and Dekese wells (Fig.…”

Section: Refraction Seismicsmentioning

confidence: 97%

“…We re-examined the calibrated seismic reflection profiles and interpreted the total of about 2600 km of seismic profiles, acquired along 35 lines in the CB, between 1974 and1976, by an Esso-Texaco consortium. The obtained model will be validated by aeromagnetic, satellite gravity data, and density measurements from rock samples in a next paper (Maddaloni et al, 2020).…”

Section: Study Approachmentioning

confidence: 98%

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The Congo Basin: Stratigraphy and subsurface structure defined by regional seismic reflection, refraction and well data

Delvaux

¹

,

Maddaloni

²

,

Tesauro

³

et al. 2021

Global and Planetary Change

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“…Later, rifting between the Bomu‐Kibali and Kasai shields caused the formation of the Congo basin (Delvaux et al., 2021). Subsequent asthenospheric upwelling could have contributed to metasomatization of their lithospheric roots (Maddaloni et al., 2021) and thus extended the area between them where depletion is absent. However, depletion of the roots of the Congo craton shields must have taken place before craton formation.…”

Section: Discussionmentioning

confidence: 99%

A Thermo‐Compositional Model of the African Cratonic Lithosphere

Finger

¹

,

Kaban

²

,

Tesauro

³

et al. 2022

Geochem Geophys Geosyst

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Cratons are the ancient continental cores, around which continents accrete and grow. They are stable for billions of years, and due to their geologic evolution often provide an abundancy of resources, for example, rare earth elements and diamonds. Cratons are usually underlain by thick continental lithosphere, their so-called "roots", which can reach up to about 250 km into the Earth (e.g., Steinberger & Becker, 2018). With a few exceptions (Kaban et al., 2015), these roots resist mantle convection, and thus deviate mantle flow. Therefore, a better understanding of cratons, their evolution and dynamics may provide further insight to large-scale dynamic and tectonic processes. Cratons appear to be buoyant with respect to the underlying mantle despite the fact that their long-term cooling causes an increase in density. A commonly cited explanation is the iso-pycnic hypothesis (Jordan, 1978) that is based on the counter-balancing effect of chemical buoyancy. The density increase caused by reduced temperatures is balanced by density decrease from depletion in heavy constituents, mostly iron (Fe;Griffin, O'Reilly, Natapov, & Ryan, 2003). Depletion is commonly measured by means of Mg#, the percentage of Magnesium (Mg) in the total amount of Mg and Fe (100*Mg/(Mg + Fe)) in mantle minerals. Mg#s around 89 are common for fertile mantle rocks, while strongly depleted samples exhibit values around 94 (Griffin, O'Reilly,

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“…Later, rifting between the Bomu-Kibali and Kasai shields caused the formation of the Congo basin (Delvaux et al, 2021). Subsequent asthenospheric upwelling could have contributed to metasomatization of their lithospheric roots (Maddaloni et al, 2021) and thus extended the area between them where depletion is absent. However, depletion of the roots of the Congo craton shields must have taken place before craton formation.…”

Section: Congo Cratonmentioning

confidence: 99%

A Thermo-Compositional Model of the African Cratonic Lithosphere

Finger

¹

,

Kaban

²

,

Tesauro

³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Cratons are the ancient continental cores, around which continents accrete and grow. They are stable for billions of years, and due to their geologic evolution often provide an abundancy of resources, for example, rare earth elements and diamonds. Cratons are usually underlain by thick continental lithosphere, their so-called "roots", which can reach up to about 250 km into the Earth (e.g., Steinberger & Becker, 2018). With a few exceptions (Kaban et al., 2015), these roots resist mantle convection, and thus deviate mantle flow. Therefore, a better understanding of cratons, their evolution and dynamics may provide further insight to large-scale dynamic and tectonic processes. Cratons appear to be buoyant with respect to the underlying mantle despite the fact that their long-term cooling causes an increase in density. A commonly cited explanation is the iso-pycnic hypothesis (Jordan, 1978) that is based on the counter-balancing effect of chemical buoyancy. The density increase caused by reduced temperatures is balanced by density decrease from depletion in heavy constituents, mostly iron (Fe;Griffin, O'Reilly, Natapov, & Ryan, 2003). Depletion is commonly measured by means of Mg#, the percentage of Magnesium (Mg) in the total amount of Mg and Fe (100*Mg/(Mg + Fe)) in mantle minerals. Mg#s around 89 are common for fertile mantle rocks, while strongly depleted samples exhibit values around 94 (Griffin, O'Reilly,

show abstract

The Congo Basin: Subsurface structure interpreted using potential field data and constrained by seismic data

Cited by 7 publications

References 47 publications

The Congo Basin: Stratigraphy and subsurface structure defined by regional seismic reflection, refraction and well data

The Congo Basin: Stratigraphy and subsurface structure defined by regional seismic reflection, refraction and well data

A Thermo‐Compositional Model of the African Cratonic Lithosphere

A Thermo-Compositional Model of the African Cratonic Lithosphere

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