Facies

, Volume 55, Issue 3, pp 443–472 | Cite as

Carboniferous stratigraphy and depositional environments in the Ahnet Mouydir area (Algerian Sahara)

Original Article
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Abstract

An up to 3,000-m-thick pile of Carboniferous rocks covers the northern fringe of the Precambrian Hoggar Massif (Touareg Shield) in southern Algeria, thus terminating the depositional history of the Palaeozoic in this sector of the North African Craton. The previous Devonian (Eifelian to Frasnian) palaeogeographic configuration of the area, characterized by ridges and shallow basins, is leveled by a widespread Famennian playa and lower Tournaisian delta sedimentation on a largely undifferentiated shelf. Tournaisian to Moscovian strata were deposited under open-marine, deltaic, shallow-subtidal, fluvial, and continental environments. The Carboniferous sequence can be subdivided into 12, largely interfingering, lithostratigraphic formations, which were dated by conodonts, ammonoids, foraminifers, and brachiopods, yielding a modified biostratigraphic framework of the area. The formations are stacked in four transgressive–regressive cycles, which include two major gaps, one during the middle Tournaisian, the other during the middle Visean to Serpukhovian. The oscillations of sea level can be traced into neighboring areas and seem coeval to early pulses of the Late Carboniferous/Early Permian glaciation of Gondwana. To a lesser degree they may reflect more local tectonic effects of the Variscan orogeny.

Keywords

Carboniferous Algeria Biostratigraphy Depositional environments Sea-level changes 
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Notes

Acknowledgements

This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG, grants We 239/15.1-4 and Ko 1829/3-1). The extensive fieldwork would not have been possible without the strenuous assistance of several students. Two short field trips were financially supported by SONATRACH and organized by K. Boumendjel and H. Naili (Boumerdès, Algeria). Brachiopods were determined by M. Mergl (Plzen, CSR) and N. Farsan (deceased), foraminifers by L. Hance (Louvain-la-Neuve, Belgium), plant remains by B. Meyer-Berthaud (Montpellier, France). The manuscript benefited from discussions with T. Aigner (Tübingen) and the critical and constructive comments of the two reviewers, H.-G. Herbig (Cologne, Germany) and I. D. Somerville (Dublin, Ireland). Technical assistance was offered by W. Gerber and P. Jeisecke (both Tübingen). We are grateful to these persons and organizations for their assistance in making this project possible.

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© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Institut für Geowissenschaften der UniversitätTübingenGermany
  2. 2.Institut für Erdwissenschaften der UniversitätGrazAustria
  3. 3.Instytut Geologii Uniwersytet Adama MickiewiczaPoznanPoland
  4. 4.Naturhistorisches Forschungsinstitut Museum für NaturkundeBerlinGermany

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