Neogene basin of Northern Tunisia: new evidence of graben structures along E–W shear zone and geodynamic implications

Azizi, Ramzi; Chihi, Lassaad

doi:10.1007/s00531-021-02077-x

Cited by 6 publications

(2 citation statements)

References 60 publications

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“…Accretion of continental fragments along Africa and Adria was followed by slab break-off, which is actually imaged by seismic tomography (e.g., Wortel & Spakman, 2000;van der Meer et al, 2018) and can also be dated considering the tectonic and magmatic evolution of the region, both along the African margin (e.g., Maury et al, 2000;Michard et al, 2006;Booth-Rea et al, 2018;Azizi & Chihi, 2021) and along the Adriatic margin (e.g., Hippolyte et al, 1994;Chiarabba et al, 2008). In Northern Africa, slab break-off initiated in central Algeria 16 Ma ago (Maury et al, 2000), and afterwards progressively propagated eastward towards the still active Calabrian subduction zone (Faccenna et al, 2001a;Argnani, 2009).…”

Section: Slab Break-off Following the End Of Oceanic Subductionmentioning

confidence: 99%

Did subduction in the western Mediterranean drive Neogene alpine dynamics? Insights from analogue modeling

Martinod,

Daou,

Métral

et al. 2024

BSGF - Earth Sci. Bull.

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We present analogue models simulating the Neogene subduction that occurred in the Western Mediterranean region, in order to understand how it impacted the regional tectonics. Although models do not include the lithospheric plate overriding the subduction zone, their surface deformations share many similarities with the Neogene tectonics of Western Europe and Iberia. We observe that the tectonic evolution is largely controlled by the roll-back of the slab, that occurred much faster than the Africa-Eurasia convergence. Models reproduce the opening of the Western Mediterranean Basins and the dispersion of the AlKaPeCa continental fragments. They also show that oceanic subduction favors the counterclockwise rotation of Adria. In more elaborated models, we introduced a pre-existing weakness along the Africa and Adria margins, to reproduce the break-off of the oceanic slab that followed the beginning of continental subduction both in Northern Africa and Italia. Slab break-off is followed by the exhumation of the subducted continent. We observe that the influence of subduction on the kinematics of Adria largely decreases following slab break-off. In models, the total counterclockwise rotation of Adria varies between 7° and more than 30°, depending on the timing of slab break-off. Since the process of subduction modifies the displacement of Adria, it also impacts the tectonic evolution of the regions that bound this plate, especially in the Alpine belt: in the Western Alps, an older Late Cretaceous to Eocene “Pyrenean-Provençal” tectonic phase accommodating N-S shortening is classically described resulting from the convergence between Africa and Eurasia. It is followed by the Neogene “Alpine phase” accommodating E-W shortening. Since this major tectonic change is not explained by a modification of the global Africa-Eurasia convergence, it should be explained instead by more local causes. Our models show that during slab-roll back and before slab break-off, the azimuth of convergence between Adria and Europe shifts from ~N-S to ~ENE-WSW. Hence, they suggest that the oceanic subduction in the Western Mediterranean may explain the “Oligocene revolution” described by Dumont et al. (2011), leading to E-W shortening in the Western Alps and to the activation of the Periadriatic right-lateral shear zones in the Central Alps. We conclude that the western Mediterranean region is a spectacular example showing how the tectonics of mountain ranges and plate boundaries may be controlled by distant subduction processes.

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Section: Slab Break-off Following the End Of Oceanic Subductionmentioning

confidence: 99%

Did subduction in the western Mediterranean drive Neogene alpine dynamics? Insights from analogue modeling

Martinod,

Daou,

Métral

et al. 2024

BSGF - Earth Sci. Bull.

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“…Internal basins of Late Miocene to Pleistocene age opened during a late-orogenic extensional collapse phase, which may reflect slab break-off, controlled by right-lateral transtensional movement on major east-northeast and northwest-trending faults (Figure 37; Azizi & Chihi, 2021). Continental molasse and lacustrine sediments, including carbonates and evaporites, were deposited in the basins accompanied by localised bimodal alkaline volcanism and intrusion (Rosenbaum et al, 2002;Booth-Rea et al, 2018;Decrée et al, 2014).…”

Section: Figure 37mentioning

confidence: 99%

Global Irish – Diversity of the diaspora

Reynolds,

Allen,

Muhling

et al. 2023

Irish-Type Zn-Pb Deposits Around the World

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The spectrum of zinc-lead deposits formed in basinal mineral systems encompasses VMS (volcanogenic massive sulphide), SHMS (shale-hosted massive sulphide), Irish-type and MVT (Mississippi valley Type) deposits. The platform carbonate-hosted part of that spectrum, the Irish-type and MVT deposits, has created the greatest challenges to pigeonholing approaches and the Irish Midland deposits have been variably considered as unique, “SedEx” variants, or MVT variants. In fact, the Irish-type spectrum of deposits can be considered as a global diaspora of diverse deposits that, nonetheless, show a number of distinct and economically significant characteristics in style and setting. For this reason, they warrant consideration as a discrete deposit type, though not in a neat pigeonhole, that is best considered in a mineralizing system context. The distinguishing features of Irish-type mineral systems can be considered in terms of source, trigger, pathway, trap, and preservation. The key features that distinguish Irish-type from ‘typical’ MVT and SHMS deposits are related to basin type and setting, timing of the mineralization event, mineralization style and chemistry, and deposit geometry. Empirically, these characteristic basin to deposit scale features overlap both MVT and SHMS but, together, are unique to Irish-type systems. This gives rise to criteria that can be applied to determine prospectivity of basins for Irish-type deposits and to target deposits within these basins. It is important to distinguish Irish-type from MVT systems because their economic characteristics are different. However, it is also important to recognise that there is great variability within the broad basinal carbonate-hosted zinc-lead deposit family and that each basin, and indeed each trend and deposit, are to some extent unique. It is therefore extremely important to avoid model-driven exploration and to develop a targeting understanding that acknowledges the model framework but is based on actual observations and data. To understand this diversity and targeting context, it is pertinent to consider the wide range of carbonate-hosted deposits that do not fit into the published MVT pigeonhole, including the Irish Midlands deposits; the Alpine deposits; deposits in the Basque-Cantabria Basin; deposits on the Gondwana margin including a number of deposits in North African,, southeast Turkey, Iran, and Duddar in Pakistan; the Early Cretaceous deposits on the Atlantic margin in Gabon; the Ordovician of the Sibumasu terrane (Tibet to Southeast Asia); Polaris in the Franklinian Basin; Nanisivik in the Borden Basin; and the Devonian Lennard Shelf deposits of Western Australia. All of these deposits occur in rift-sag basins with carbonate platforms, in some cases with multiple rift-sag cycles or with successor basins and, where constrained, the mineralization event is syn-basinal and typically related to early extension or inversion events. The deposits are stratabound and mostly tabular and continuous, often show strong direct control by extensional structures, are typically dominated by replacement, and commonly have significantly higher grades than ‘typical’ MVT deposits such as those in the mid-continent US, Silesia (Poland) and Pine Point (Canada).

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Seismic reflection interpretation and structural characterization of a strategic deep aquifer reservoir in a semi-arid region: a case study of the Oued Gueniche plain, Northern Tunisia

Zaghdoudi,

Al Haji,

Sifi

et al. 2024

Acta Geophys.

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Neogene basin of Northern Tunisia: new evidence of graben structures along E–W shear zone and geodynamic implications

Cited by 6 publications

References 60 publications

Did subduction in the western Mediterranean drive Neogene alpine dynamics? Insights from analogue modeling

Did subduction in the western Mediterranean drive Neogene alpine dynamics? Insights from analogue modeling

Global Irish – Diversity of the diaspora

Seismic reflection interpretation and structural characterization of a strategic deep aquifer reservoir in a semi-arid region: a case study of the Oued Gueniche plain, Northern Tunisia

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