Structural features of the Southwest African continental margin according to results of lithosphere-scale 3D gravity and thermal modelling

Maystrenko, Yuriy; Scheck‐Wenderoth, Magdalena; Hartwig, Alexander; Anka, Zahie; Watts, A. B.; Hirsch, Katja K.; Fishwick, Stewart

doi:10.1016/j.tecto.2013.04.014

Cited by 39 publications

(99 citation statements)

References 59 publications

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“…The database for this study consists of regional 3D lithospheric-scale structural and thermal models for the SW African (Maystrenko et al, 2013) and the Norwegian passive margins (Scheck-Wenderoth et al, 2007;Scheck-Wenderoth and Maystrenko, 2008). These models integrate and are consistent with observed seismic data, gravity data, as well as with measured temperatures and heat flow.…”

Section: Exploited Modelsmentioning

confidence: 99%

“…The sedimentary units at both settings are predominantly composed of siliciclastic rocks with varying degrees of compaction (Stewart et al, 2000;Maystrenko et al, 2013;ScheckWenderoth et al, 2007;Scheck-Wenderoth and Maystrenko, 2008;Brekke, 2000).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…In spite of a very similar configuration of the crust, the underlying lithospheric mantle in the two study areas differs. The younger lithospheric mantle beneath the oceanic crustal 30 parts of the North Atlantic is significantly thinner than the older counterpart of the South Atlantic (Scheck-Wenderoth et al, 2007;Scheck-Wenderoth and Maystrenko, 2008;Maystrenko et al, 2013). By comparing the calculated geothermal gradients of these margins, we particularly address the consequences of the lateral heterogeneities for the thermal field, and test the hypothesis that the present-day thermal field is different for the two settings and ultimately determined by the lithospheric mantle characteristics.…”

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confidence: 98%

“…The two considered 3D conductive thermal models (Scheck-Wenderoth and Maystrenko, 2008;Maystrenko et al, 2013) were created as a numerical solution to Eq. 2 in the steady-state condition ( ∂T ∂t = 0) and by considering lithology-dependent thermal properties (Table 1).…”

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confidence: 99%

“…The depth of the Moho varies between 20 and 30 km BSL beneath the continental shelf ( In their 3D thermal model, Maystrenko et al (2013), considered a temperature of 5…”

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confidence: 99%

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Variability of geothermal gradient across two differently aged continental volcanic passive margins: The Southwest African and the Norwegian margins

Gholamrezaie

Scheck‐Wenderoth

Sippel

et al. 2017

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Abstract. The aim of this study is to investigate the shallow thermal field differences for two differently aged passive continental margins by analyzing regional variations in geothermal gradient and exploring the controlling factors for these variations.Hence, we analyzed two previously published 3D conductive and lithospheric-scale thermal models of the Southwest African and the Norwegian passive margins. These 3D models differentiate various sedimentary, crustal and mantle units and integrate different geophysical data such as seismic observations and the gravity field. We extracted the temperature-depth distributions 5 in 1 km intervals down to 6 km below the upper thermal boundary condition. The geothermal gradient was then calculated for these intervals between the upper thermal boundary condition and the respective depth levels (1, 2, 3, 4, 5, and 6 km below the upper thermal boundary condition). According to our results, the geothermal gradient decreases with increasing depth and shows varying lateral trends and values for these two different margins. We compare the 3D geological structural models and the geothermal gradient variations for both thermal models and show how radiogenic heat production, sediment insulating 10 effect, and thermal LAB depth influence the shallow thermal field pattern. The results indicate an ongoing process of oceanic mantle cooling at the young Norwegian margin compared with the old SW African passive margin that seems to be thermally equilibrated at the present-day.

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Section: Exploited Modelsmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

mentioning

confidence: 98%

mentioning

confidence: 99%

“…The depth of the Moho varies between 20 and 30 km BSL beneath the continental shelf ( In their 3D thermal model, Maystrenko et al (2013), considered a temperature of 5…”

mentioning

confidence: 99%

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