Rôle et importance de la fracturation méridienne dans les déformations crétacées et alpines de la ‘zone des diapirs’ (Tunisie septentrionale)

Chikhaoui, M.; Turki, Mohamed Moncef

doi:10.1016/0899-5362(95)00066-3

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…Structurally, the NOSA belt consists of N–S to NE–SW trending thrusts and folds characterized by narrow asymmetric east‐verging anticlines affecting a Triassic–Quaternary sequence of sedimentary rocks with many stratigraphic gaps and unconformities (Burollet, 1956, 1991). Atlasic NE–SW trending folds took a generally N–S trend near faults of the same orientation in response to the NW–SE directed compression during the Upper Miocene (Chikhaoui & Turki, 1995). Along the NOSA belt, which is bounded by a sub‐meridian (generally N–S trending) fault system, the Jurassic series are generally in tectonic contact with Triassic and Cretaceous series.…”

Section: Geology and Tectonic Settingsmentioning

confidence: 99%

Genesis of the Jurassic Carbonate‐Hosted Pb–Zn Deposits of Jebel Ressas (North‐Eastern Tunisia): Evidence from Mineralogy, Petrography and Trace Metal Contents and Isotope (O, C, S, Pb) Geochemistry

et al. 2011

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The S values in galenas from the Pb-Zn deposits range from -1.5 to +11.4‰, with an average of 5.9‰ and standard deviation of 3.9‰. These data imply mixing of thermochemically-reduced heavy sulfur carried in geothermal-and fault-stressdriven deep-seated source fluid with bacterially-reduced light sulfur carried in topography-driven meteoric fluid. Lead isotope ratios in galenas from the Pb-Zn deposits are homogenous and indicate a single upper crustal source of base-metals for these deposits. Synthesis of the geochemical data with geological data suggests that the base-metal mineralization at Jebel Ressas was formed during the Serravallian-Tortonian (or Middle-Late Miocene) Alpine compressional tectonics.

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Section: Geology and Tectonic Settingsmentioning

confidence: 99%

Genesis of the Jurassic Carbonate‐Hosted Pb–Zn Deposits of Jebel Ressas (North‐Eastern Tunisia): Evidence from Mineralogy, Petrography and Trace Metal Contents and Isotope (O, C, S, Pb) Geochemistry

et al. 2011

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“…Several authors suggest the existence of a close link between tectonics and paleogeography in Tunisia (Boltenhagen 1981;Chikhaoui and Turki 1995). In particular, they note from the Lower to Middle Cretaceous that synsedimentary tectonics fragmented the sedimentary floor of the basin (Boltenhagen 1981;Chihi 1995) into a series of tilted blocks that emerged at the beginning of the Aptian interval ( Fig.…”

Section: Geodynamic Setting Of the Bir M'ccherga Basinmentioning

confidence: 95%

“…Reduced ones were built on their resistant side. The raised edges of these micro-basins show mismatches and breaches of dismantling (Martinez et al 1991;Ellouz 1984;Chikhaoui and Turki 1995). During this time volcanic events also accompanied sedimentation, particularly in the platform-basin transition area where NW-SE rifting (crustal thinning) was located at Enfidaville, the Sahel and the Pelagian Sea ( Fig.…”

Section: Geodynamic Setting Of the Bir M'ccherga Basinmentioning

confidence: 99%

Aptian–Albian shale oil unconventional system as registration of Cretaceous oceanic anoxic sub-events in the southern Tethys (Bir M’Cherga basin, Tunisia)

Talbi

Lakhdar

Smati

et al. 2018

J Petrol Explor Prod Technol

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The Bir M'Cherga basin (North-east Tunisia), with about 600 km 2 area, had recorded four Middle Cretaceous source rocks well stratigraphically correlated with the four known oceanic anoxic sub-events: OAE1a, OAE1b, OAE1c, and OAE1d. Variety of lithology, thickness and organic richness had characterized these source rocks. The sedimentary tectonic analysis, the petrology and geochemistry study established the petroleum system of these source rocks. Basin formation began early in the Barremian-Aptian interval by synsedimentary tectonics reactivating old basement faults. During the Aptian-Albian, the formed basin had a depocenter that recorded thicker black shales while its NW and SE edges remained raised under the Triassic halokinetic activities. The evolution of the sedimentary filling during this period generated two sedimentary cycles corresponding to two filling second-order fining and thickening upwards sequences. The black shales that constitute these source rocks are formed between subtidal and external platform environment and are interbedded with juxtaposed high organic rich layers and poor ones. The rich organic facies consists of dark shale that constitutes the source rock. The poor organic beds formed by light grey and nodular limestones constitute an intra host reservoir. Thereby, petroleum system consists in an "unconventional oil shale hybrid systems with a combination of juxtaposed organic-rich and organic-lean intervals associated to open fractures". The kerogen is essentially amorphous, with marine planktonic origin and low ligneous organic matter contribution. This organic material of dark facies had been well preserved in an anoxic environment with little or no energy. Light grey limestones were of oxic-to-sub-oxic environment. The stage of the thermal evolution for these source rocks provided by IH/T max diagram is of the "oil window". The average transformation ratio (TR) is estimated as 45% suggesting thus black shales are oil shale resources which still close about untransformed 55% of its hydrocarbon generating potential. The expulsion and release of oil into these source rocks are proven by the observation of hydrocarbons filling micro-cracks and by the variable values of the oil saturation index OSI ranging from 0 to 138%. The latter exceeds 100% near the paleo-high reliefs indicating two "oil crossover" areas attributed to the high degree of oil source rock saturation and accumulation of hydrocarbons considered ideal for hydraulic fracturing. This oil crossover is a consequence of secondary migration into black shale source rock, achieved by various faults created during the distensive phase that were reactivated again several times.

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“…This region is located at the South-Western extremity of the diapir zone (Perthuisot, 1978;Hatira et al, 2000). It is represented by complex tectonic structures related to the Triassic evaporitic deposits ascension movements and strike-slip faults (Chikhaoui et al, 1991(Chikhaoui et al, , 2002Chikhaoui and Turki, 1996;Memmi, 1999) (Fig 1). According to these authors, the structural style complexity was the result of the extensive tectonic movement, which led to the extrusion of Triassic evaporites during the Aptian-Albian period.…”

Section: Stratigraphic and Structural Settingsmentioning

confidence: 99%

The Albian oceanic anoxic events record in central and northern Tunisia: Geochemical data and paleotectonic controls

Khalifa

Affouri

Rigane

et al. 2018

Marine and Petroleum Geology

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The Albian organic-rich successions of the lower part of the Fahdene Formation (Albian to Cenomanian, Tunisia) were studied using sedimentology (analysis of carbonate contents and observation of thin sections), bulk organic geochemistry (Rock-Eval pyrolysis), and molecular biomarker distributions. The selected outcrops cover different structural domains from western central Tunisia (Jebel Hamra) to the Diapir zone or the Tunisian Trough (Koudiat Berkouchia, Jebel Ghazouan and Ain Asker from the southwest to the northeast, respectively). Total Organic Carbon values between 0.17 and 3.43% evidenced the record of the Albian oceanic anoxic events OAE1b and OAE1c in this southern Tethys margin. Rock-Eval data and molecular biomarkers (n-alkanes, steranes and terpanes) revealed thermally mature organic matter (OM) consisting of a mixed Type II/III OM (marine planktonic and continental origins). The abundant tricyclic terpanes, C30 17α(H) Diahopanes, and the regular decrease of homohopanes (C31 to C35) in the terpane series, were also indicative of a high contribution of bacterial OM that had been developed under stagnant dysoxic/anoxic environments.

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Rôle et importance de la fracturation méridienne dans les déformations crétacées et alpines de la ‘zone des diapirs’ (Tunisie septentrionale)

Cited by 13 publications

References 6 publications

Genesis of the Jurassic Carbonate‐Hosted Pb–Zn Deposits of Jebel Ressas (North‐Eastern Tunisia): Evidence from Mineralogy, Petrography and Trace Metal Contents and Isotope (O, C, S, Pb) Geochemistry

Genesis of the Jurassic Carbonate‐Hosted Pb–Zn Deposits of Jebel Ressas (North‐Eastern Tunisia): Evidence from Mineralogy, Petrography and Trace Metal Contents and Isotope (O, C, S, Pb) Geochemistry

Aptian–Albian shale oil unconventional system as registration of Cretaceous oceanic anoxic sub-events in the southern Tethys (Bir M’Cherga basin, Tunisia)

The Albian oceanic anoxic events record in central and northern Tunisia: Geochemical data and paleotectonic controls

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