Influence of basement heterogeneity on the architecture of low subsidence rate Paleozoic intracratonic basins (Ahnet and Mouydir basins, Central Sahara)

Perron, Paul; Guiraud, Michel; Vennin, Emmanuelle; Moretti, Isabelle; Portier, Éric; Pourhiet, Laëtitia Le; Konaté, Moussa

doi:10.5194/se-2018-50

Cited by 1 publication

(25 citation statements)

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“…subsidence (Fig. 1), which are very well documented on the Saharan Platform (Perron et al, 2018). Driven by this geological example, the present contribution introduces alternative hypothesis to thermal subsidence in context of accretionary lithosphere and aims to test these different hypotheses by the mean of thermo-mechanical simulations in order to circumscribe what first-order mechanisms can maintain the low, long-term subsidence rate of the intracratonic basins through the geological time and what second-order forcing can explain local acceleration and inversion of subsidence.…”

Section: Introductionmentioning

confidence: 72%

“…These basins are filled with continental to shallow-water sedimentation indicating low topographic relief. In many cases, their structural framework can be characterized by the association of arches s.l and basins of different kilometric wavelengths reactivated through time (de Brito Neves et al, 1984;Quinlan, 1987;Seyfert, 1987;Perron et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Compilation of total burial subsidence of intracratonic basins modified from literature showing periods of acceleration (ALRS: Acceleration of the Low Rate subsidence), deceleration (DLRS: Deceleration of the Low Rate Subsidence) and inversion (ILRS: Inversion of the Low Rate Subsidence) of the low rate subsidence. 1: New York, USA, well 7-6 (Adkinson, 1966from Sleep et al, 1980; 2: Ohio, USA, well 6-6 (Adkinson, 1966from Sleep et al, 1980; 3: Johnson County, USA, Illinois well (Sleep et al, 1980); 4: Michigan Basin well, USA (Sleep and Sloss, 1978); 5: Ahnet Basin, Algeria, well W1 (Kracha, 2011); 6: Ghadames/Berkine Basin, Algeria (Yahi, 1999); 7: Illizi Basin well, Algeria (Wells et al, 2018); 8: Mouydir Basin, Algeria Well W21 (Perron et al, 2018); 9: Tyumen SG-6 section, Urengoy region, Russia (Nikishin et al, 2002); 10: North Dakota, Williston Basin, USA, well 11 (Smith, 1967 from Fowler andNisbet, 1985); 11: Williston Basin, Saskatchewan, USA, well 1 (Fowler and Nisbet, 1985); 12: Paris Basin, France, well CFX-1 (Brunet and Pichon, 1982); 13: Parnaíba Basin, Brazil, well 2-BAC (Tozer et al, 2017); 14: Northeast German Basin, Germany (Scheck and Bayer, 1999). The dashed line represents thermal seafloor subsidence from Xie and Heller (2009).…”

Section: Introductionmentioning

confidence: 99%

“…Finally, a ternary classification of intracratonic basins is proposed based on their tectono-stratigraphic architecture. We place the different basins of the Saharan Platform example that inspired this modelling study (Perron et al, 2018;Figs. 2 and 3) into this new classification to discuss what the tectonic architecture of basins tells us about external and internal forcing that are responsible for their long subsidence histories.…”

Section: Introductionmentioning

confidence: 99%

“…2 Arches and basins in accretionary type lithosphere: the Saharan Platform example Intracontinental sag basins (Holt et al, 2010(Holt et al, , 2015Holt, 2012) are often basins formed upon a heterogeneous inherited lithosphere assembled during different former geodynamic events (Condie, 2007;Cawood, 2009;Cawood et al, 2009) very long time before they begin to subside (Allen and Perron et al, (2018) showing the specific zonation of the terranes, the paleocurrents directions (from Beuf et al, 1971) and the evidence of sedimentary structures on arches (from Perron et al, 2018;Wendt et al, 2006). Terrane names and abbreviations: Tassendjanet (Tas), Tassendjanet nappe (Tas n.), Ahnet (Ah), In Ouzzal Granulitic Unit (IOGU), In Zaouatene (Za), In Teidini (It), Iskel (Isk), Tefedest (Te) and Egéré-Aleskod (Eg-Al).…”

Section: Introductionmentioning

confidence: 99%

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Control of inherited accreted lithospheric heterogeneity on the architecture and the low, long-term subsidence rate of intracratonic basins

Perron¹,

Pourhiet²,

Guiraud³

et al. 2021

BSGF - Earth Sci. Bull.

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Intracratonic basins tend to subside much longer than the timescale predicted by thermal relaxation of the lithosphere. Many hypotheses have been suggested to explain their longevity, yet few have been tested using quantitative thermo-mechanical numerical models, which capture the dynamic of the lithosphere. Lithospheric scale geodynamic modelling preserving the tectono-stratigraphic architecture of these basins is challenging because they display only few kilometres of subsidence over 1000 of km during time periods exceeding 250 Myr. Here we present simulations that are designed to examine the relative role of thermal anomaly, tectonics and heterogeneity of the lithosphere on the dynamics of intracratonic basins. Our results demonstrate that initial heterogeneity of accretionary continental lithosphere explains long-term subsidence and the arches-basins architecture of Saharan type intracratonic basins at first order. The simulations show that initially warm and heterogeneous lithospheres inherited from accretion are strong enough to resist local isostatic re-equilibration for very long period of time. Indeed, the lateral density variations store potential gravitational energy that is then slowly dissipated by differential erosion and slow vertical movements. For relatively well-accepted coefficient of erosion of 10-6 m2/s, the subsidence last longer than 250 Myr. Extensional tectonic forcing and thermal anomalies both results in an effective strength drop of the lithosphere, which allows a temporarily acceleration of local isostatic re-equilibration. Periodic changes in far field tectonic forcing from extension to compression complicate the tectono-stratigraphic architecture (intra-basin arches, sub-basins) introducing stratigraphic unconformities between different neighbouring basins such as the ones observed in North Africa.

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Section: Introductionmentioning

confidence: 72%