Stratigraphy, sedimentology and structure of the Numidian Flysch thrust belt in northern Tunisia

Abstract

The Cutri Formation's type location exposed in the NW of Mallorca, Spain, has previously been described and further interpreted as a base-of-slope carbonate apron. Incorporating new field and laboratory analysis this paper enhances this interpretation. From this analysis, it can be shown without reasonable doubt that the Cutri Formation was deposited in a carbonate base-of-slope environment on the palaeowindward side of a Mid-Jurassic Tethyan platform. Key evidence such as laterally extensive exposures, abundant deposits of calciturbidtes and debris flows amongst hemipelagic deposits strongly support this interpretation.Keywords: calcilturbidite, debrite, Bositra, Jurassic, Mallorca, base-of-slope apron Resumen La Formación Cutri, en su localidad tipo en el noroeste de Mallorca (España), ha sido previamente interpretada como un posible prisma de talud carbonático. Esta interpretación es ratificada y pormenorizada en este trabajo con la incorporación de nuevos datos de campo y de laboratorio. El análisis realizado muestra que la Formación Cutri se depositó en la base del talud, en el lado de un ambiente carbonato de base de la pendiente a barlovento de una plataforma carbonatada tetisiana del Jurásico Medio. Esta interpretación está apoyada por extensos afloramientos de gran continuidad lateral, abundantes niveles de calciturbidtas y debris-flows entre los depósitos hemipelágicos.Palabras clave: calcilturbidita, debrita, Bositra, Jurásico, Mallorca, prisma de base de talud carbonático Journal of Iberian Geology 42 (1) 2016: [95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112]

Edough-Cap de Fer Polymetallic District, Northeast Algeria: II. Metallogenic Evolution of a Late Miocene Metamorphic Core Complex in the Alpine Maghrebide Belt

“…Interleaved between the internal massifs and the Tellian nappes is an elongated flysch belt that extends from the Rif to Calabria. This flysch belt comprises a complex of Mesozoic nappes (Kabylian flysch), former cover of an elongated oceanic Tethysian tract (Durand-Delga et al 2000), and the Numidian flysch (Late Oligocene-Burdigalian), deposited on the African margin during opening of the Algeria-Provence oceanic margin (Thomas et al 2010) and incorporated into the nappe pile at the end of the Burdigalian (Bouillin 1979;Sami et al 2010). The Edough-Cap de Fer area in eastern Algeria ( Fig.…”

Sedimentology of a Middle Jurassic Base-of-Slope environment, Cutri Formation, Mallorca

“…Similar U-shaped back-filled channels cutting across similar lithofacies have been described by Mullins et al (1984), Phelps and Kerans, (2007), Noda andToshimitsu (2009), andSami et al (2010). Gully fills that cut into slope mudstone and are similarly plugged with coarser sediment are described from the Oligo-Miocene Numidian Flysch, Tunisia (Sami et al, 2010), the Devonian Prongs Creek Formation, Yukon (Mullins and Cook, 1986), This cliff is underlain and overlain by pack-grainstone packages and these packages are interbedded with wackepackstones.…”

“…Gully fills that cut into slope mudstone and are similarly plugged with coarser sediment are described from the Oligo-Miocene Numidian Flysch, Tunisia (Sami et al, 2010), the Devonian Prongs Creek Formation, Yukon (Mullins and Cook, 1986), This cliff is underlain and overlain by pack-grainstone packages and these packages are interbedded with wackepackstones. The pack-grainstone packages are observed to erode into underlying units (see 500, 600 and 1200 cm on …”

Edough-Cap de Fer Polymetallic District, Northeast Algeria: I. The Late Miocene Paleogeothermal System of Aïn Barbar and Its Cu–Zn–Pb Vein Mineralization

“…4). The latter is essentially undeformed and in outcrop displays an alternation of thick sandstone (up to 10 m) and thin (several 10 cm to a few meters) mudstone typical of the Kroumirie member of the Numidian sequence, as described in northeastern Tunisia (Sami et al 2010, and references therein), in which the basal (more argillaceous) member was truncated during nappe emplacement. The original (pre-tectonic) thickness of this Kroumirie member is estimated to *1200 m (Lahondere et al 1979;Sami et al 2010).…”

“…Interleaved between the internal massifs and the Tellian nappes is an elongate flysch belt that extends from the Rif to Calabria. This belt comprises a complex of Mesozoic nappes (Kabylian flysch), former cover of an oceanic Tethysian tract (Durand-Delga et al 2000), and Numidian flysch (Late Oligocene-Burdigalian), which was deposited on the African margin during opening of the Algeria-Provence oceanic basin (Thomas et al 2010) and incorporated in the nappe at the end of the Burdigalian (Bouillin 1979;Sami et al 2010).…”