Neogene extensional deformation and related stress regimes in central Tunisia

Belguith, Youssef; Geoffroy, Laurent; Rigane, Adel; Gourmelen, Claude; Dhia, Hamed Ben

doi:10.1016/j.tecto.2011.06.009

Cited by 43 publications

(21 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resulting nappe pile was then folded during the Late Tortonian (Khomsi et al 2009). Short-lived returns to extensional conditions are recorded in the Late Tortonian-Early Messinian, and in the Pliocene Belguith et al 2011), which promoted the formation of small continental basins in the Nappe Zone (e.g., Late Tortonian-Early Messinian Sidi Driss and Zouaraa basins, and Pliocene Tamra basin) (Fig. 2).…”

Section: Regional Geologymentioning

confidence: 99%

Tectonomagmatic Context of Sedex Pb–Zn and Polymetallic Ore Deposits of the Nappe Zone Northern Tunisia, and Comparisons with MVT Deposits in the Region

Decrée

Marignac

Abidi

et al. 2016

Mineral Deposits of North Africa

View full text Add to dashboard Cite

The Nefza region (Nappe Zone, northern Tunisia) is known both as a Late Miocene magmatic province and a base-metal district. In this region, small, post-nappe, continental extensional basins (Sidi Driss and (Sedex). In addition to this mineralization, the Nappe zone contains other Pb-Zn and polymetallic deposits that show similarities both to the SHMS-Sedex and MVT deposits of the Dome and Graben zones, namely the "peri-diapiric" deposits of Jebel (Jb) el Hamra, Jalta, and Jebel Ghozlane. All of the Nappe Zone deposits share common characteristics, including: (1) age-the deposits formed between late collisional events (Late Tortonian) and inception of the Early Messinian extensional regime, in the context of the Alpine Maghrebide belt formation; (2) presence of pre-existing sulphates-these were likely the main source of sulphur for the sulphides; and (3) hydrothermal systems leading to their genesisthese testify to alternating influx of cold and warm fluids. The involvement of high temperature fluids are deduced from fluid inclusion studies (Th values of 140-240°C), whereas the presence of distinctive sphalerite textures (microspherules and colloform textures) and sulphur isotopic compositions demonstrate in situ bacterial sulphate reduction, and consequently deposition at temperatures below 80°C. These data constitute unifying characteristics for these mineralizations that are in contrast to the features of Pb-Zn(-fluorite) MVT deposits occurring in the Dome and Graben zones of Tunisia. The geodynamic context prevailing during the Late Miocene in the Nappe Zone is the underlying common factor that explains the diversity of ore deposits formed at that time in this region. Most deposits are located in the vicinity of shear zones and associated lineaments inherited from the Variscan orogeny. These deep structures were reactivated by transtensional processes during the Alpine orogeny and controlled post-collisional magmatism, circulation of hydrothermal fluids, and locations of related ore deposits and showings in the Nappe Zone.

show abstract

Section: Regional Geologymentioning

confidence: 99%

Tectonomagmatic Context of Sedex Pb–Zn and Polymetallic Ore Deposits of the Nappe Zone Northern Tunisia, and Comparisons with MVT Deposits in the Region

Decrée

Marignac

Abidi

et al. 2016

Mineral Deposits of North Africa

View full text Add to dashboard Cite

show abstract

“…They are separated by NE-SW-trending sinistral faults and are downthrown essentially by the WNW-ESE-to NW-SE-oriented normal faults (Figs 8-14). The evolution of the Bou Arada Trough indicates some differences when compared with the other Pliocene-Quaternary troughs of the central Tunisian Atlas described by Dlala et al (1983), Philip et al (1986), Chihi & Philip (1998), hadj Sassi et al (2006 and Belghith et al (2011). Indeed, an intimate relationship exists since the Campanian between the facies distribution and thicknesses, and movements of the NW-SE-oriented faults.…”

Section: Discussionmentioning

confidence: 72%

Tectonosedimentary evidence in the Tunisian Atlas, Bou Arada Trough: insights for the geodynamic evolution and Africa–Eurasia plate convergence

Chelbi

Kamel

Harrab

et al. 2013

JGS

View full text Add to dashboard Cite

The Bou Arada Trough is an east-west-oriented structure located 80 km SW of Tunis, characterizing the central Tunisian Atlas. This trough is filled by a thick Quaternary sand and clay series and is bordered by complex systems of folds generally trending NE-SW. Contacts between the Bou Arada Trough and the neighbouring folds are accommodated by NE-SW-and NW-SE-oriented faults. In contrast to the other troughs of the Tunisian Atlas, which are related to the Pliocene-Quaternary orogenic period, the geodynamic evolution of the Bou Arada Trough began in the Maastrichtian and has continued until the present day. Structural, tectonosedimentary and seismic data analyses are undertaken in the study area to better understand the evolutionary scenario of this trough. The results obtained show that the Bou Arada Trough is fragmented into three NW-SE-oriented sub-basins and records a continuous history of downthrow. Indeed, during extensional to transtensional regimes, this trough has evolved in response to the two networks of perpendicular fractures whereas during compressive to transpressive periods, the collapse of the Bou Arada Trough has been induced by a pull-apart mechanism using the same network of faults but with a strike-slip movement. The Bou Arada Trough thus preserves a record of the convergence between the European and African plates since the Maastrichtian.

show abstract

“…Tavani, Vignaroli, and Parente (2015) found evidences of an Early Burdigalian extension in the Penestrini Mountains (Central Apennines) followed by a tectonic quiescence up to the Tortonian. Belguith et al (2011) have documented a minor Lower-Middle Miocene extension in onshore Tunisia. La Bruna et al (2017Bruna et al ( , 2018 reported several evidences of extensional tectonics associated to the foreland basin evolution in the Monte Alpi area (Southern Appenines) during the Miocene.…”

Section: Early Miocene Extension (D1)mentioning

confidence: 99%

Late Oligocene to Pliocene Extension in the Maltese Islands and Implications for Geodynamics of the Pantelleria Rift and Pelagian Platform

et al. 2019

View full text Add to dashboard Cite

The tectonic and geodynamic evolution of the Pelagian platform and of the Pantelleria Rift System, located in the foreland of the Apennine‐Sicilian‐Maghrebian Belt, from the Late Oligocene onward, is still debated. Here we present a new interpretation based on structural data collected in the Malta and Gozo islands. With a tectonic back‐stripping approach, we recognized two main extensional events separated by a period of tectonic quiescence: (D1) Early Miocene WNW‐ESE extension and (D2) Late Miocene to Pliocene N‐S extension that led to the opening of the Pantelleria Rift System. During both extensional events the Maltese Islands and the Pelagian Platform were located in the foreland of the Apennine‐Sicilian‐Maghrebian Belt (Western Mediterranean Arc), in a period of slab rollback. We suggest that both tectonic events are an evidence of the extensional regime imposed on the foreland area by the rollback of the subducting slab. The switch in the main extension axis between D1 and D2 (WNW‐ESE vs. N‐S) can be interpreted as a result of the varying orientation and distance of the trench due to the progressive development of the Western Mediterranean Arc and provides an independent tool to “monitor” the slab rollback. Results obtained in this study allowed, for the first time, to bind the tectonic evolution of the area with the geodynamic evolution of the Western and Central Mediterranean.

show abstract

Neogene extensional deformation and related stress regimes in central Tunisia

Cited by 43 publications

References 41 publications

Tectonomagmatic Context of Sedex Pb–Zn and Polymetallic Ore Deposits of the Nappe Zone Northern Tunisia, and Comparisons with MVT Deposits in the Region

Tectonomagmatic Context of Sedex Pb–Zn and Polymetallic Ore Deposits of the Nappe Zone Northern Tunisia, and Comparisons with MVT Deposits in the Region

Tectonosedimentary evidence in the Tunisian Atlas, Bou Arada Trough: insights for the geodynamic evolution and Africa–Eurasia plate convergence

Late Oligocene to Pliocene Extension in the Maltese Islands and Implications for Geodynamics of the Pantelleria Rift and Pelagian Platform

Contact Info

Product

Resources

About