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Frasnian (Late Devonian) conodonts and environment at the northern margin of the Algerian Sahara platform: the Ben Zireg section

Published online by Cambridge University Press:  17 February 2015

ABDESSAMED MAHBOUBI ,
RAIMUND FEIST ,
JEAN-JACQUES CORNÉE ,
ABDELKADER OUALI MEHADJI  and
CATHERINE GIRARD
ABDESSAMED MAHBOUBI
Affiliation:
Institut des Sciences de l’Evolution, Université Montpellier 2, CNRS, IRD, CC064, Place Eugène Bataillon, Montpellier Cedex 05 (France)
RAIMUND FEIST
Affiliation:
Institut des Sciences de l’Evolution, Université Montpellier 2, CNRS, IRD, CC064, Place Eugène Bataillon, Montpellier Cedex 05 (France)
JEAN-JACQUES CORNÉE
Affiliation:
UMR 5243 CNRS, Université Montpellier 2, Geosciences Montpellier, Place Eugène Bataillon, 34095 Montpellier Cedex 05 (France)
ABDELKADER OUALI MEHADJI
Affiliation:
Département des Sciences de la Terre, Université d’Oran, Es Sénia, Oran (Algérie)
CATHERINE GIRARD*
Affiliation:
Institut des Sciences de l’Evolution, Université Montpellier 2, CNRS, IRD, CC064, Place Eugène Bataillon, Montpellier Cedex 05 (France)
*
§Author for correspondence: catherine.girard@univ-montp2.fr
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Abstract

The Ben Zireg anticline NW of Bechar yields the currently most-important Frasnian succession on the northern margin of the Algerian Sahara. It represents 26.5 m of calcilutites which are attributed to the middle–late Frasnian. As the early Frasnian is not represented, the succession rests conformably on undifferentiated, probably late Givetian, substrate. Fine-scaled conodont biostratigraphy reveals a continuous sequence of Montagne Noire Zones 5–13, superseded by the earliest Famennian Lower triangularis Zone. The deposits are organized into 15 sedimentary cycles that are initially condensed and become dilated upwards. Conodont biofacies indicate an overall deepening towards the top of the section with an episode of slight shallowing at the MN11/12 transition marked by an increase of ancyrodellids, which is also seen in the Marhouma section of the Ougarta region (SW Algeria). Homogeneous calcareous microfacies with only a few shaly intercalations determine a predominantly oxygenated depositional environment on an outer platform, submarine rise or ramp setting. This is also indicated by relatively low sedimentation rates which are similar in selected sections from the Tafilalt platform, and contrast with those from the Marhouma trough and the Maider basin. Unlike other Frasnian successions south of the Atlas Fault, but similar to the Moroccan Meseta, the Upper Kellwasser horizon is clearly discriminated at Ben Zireg by an outstanding occurrence of black shales on top of the oxygenated latest Frasnian deposits.

Keywords

Frasnianconodont biostratigraphybiofaciesdepositional environmentNW Algerian Sahara

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Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 5 , September 2015 , pp. 844 - 857
Copyright
Copyright © Cambridge University Press 2015 

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References

Aboussalam, Z. S. 2003. Das “Taghanic-Event” im höheren Mittel-Devon von West-Europa und Marokko. Münstersche Forschungen Zur Geologie Und Paläontologie 9, 1–332.Google Scholar
Allary, A., Lavenu, A. & Ribeyrolles, M. 1976. Etude tectonique et microtectonique d’un segment de chaine hercynienne dans la partie sud-orientale du Maroc central. Notes et Mémoires Service Géologique Maroc 261, 113–66.Google Scholar
Becker, R. T. & House, M. R. 1998. Proposals for an international substage subdivision of the Frasnian. SDS Newsletter 15, 17–22.Google Scholar
Becker, R. T. & House, M. R. 2000 a. Devonian ammonoid succession at Jebel Amelane (western Tafilalt, southern Morocco). Notes et Mémoires du Service Géologique du Maroc 399, 49–56.Google Scholar
Becker, R. T. & House, M. R. 2000 b. Late Givetian and Frasnian ammonoid succession at Bou Tchrafine (Anti Atlas, southern Morocco). Notes et Mémoires du Service Géologique du Maroc 399, 27–36.Google Scholar
Belka, Z., Klug, C., Kaufmann, B., Korn, D., Döring, S., Feist, R. & Wendt, J. 1999. Devonian conodont and ammonoid succession of the eastern Tafilalt (Ouidane Chebbi section), Anti-Atlas, Morocco. Acta Geologica Polonica 49, 1–23.Google Scholar
Branson, E. B. & Mehl, M. G. 1934. Conodonts from the Grassy Creek Shale of Missouri. The University of Missouri Studies 8, 171–259.Google Scholar
Bultynck, P. 1970. Révision stratigraphique et paléontologique (Brachiopodes et Conodontes) de la coupe type du Couvinien. Mémoire de l’Institut géologique de l’Université de Louvain 26, 1–152.Google Scholar
Bultynck, P. 1986. Accuracy and reliability of conodont zones: the Polygnathus asymmetricus “zone” and the Givetian–Frasnian boundary. Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 56, 269–80.Google Scholar
Bultynck, P. 1987. Pelagic and neritic conodont successions from the Givetian of the pre-Sahara Morocco and the Ardennes). Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 57, 149–81.Google Scholar
Bultynck, P., Helsen, S. & Hayduckiewich, J. 1998. Conodont succession and biofacies in upper Frasnian formations (Devonian) from the southern and central parts of the Dinant Synclinorium (Belgium): Timing of facies shifting and correlation with late Frasnian events. Bulletin de Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 68, 25–75.Google Scholar
Bultynck, P. & Jacobs, L. 1981. Conodontes et sédimentologie des couches de passage du Givétien au Frasnian dans le Nord du Tafilalt et dans le Ma’der (Maroc présaharien). Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 53, 1–24.Google Scholar
Clausen, C. D., Leuteritz, K. & Ziegler, W. 1979. Biostratigraphie und Lithofazies am Südrand der Elsper Mulde (hohes Mittel- und tiefes Oberdevon; Sauerland, Rheinisches Schiefergebirge). Geologisches Jahrbuch 51, 3–37.Google Scholar
Conrad, J., Massa, D. & Weyant, M. 1986. Late Devonian regression and Early Carboniferous transgression on the Northern African platform. Annales de la Société Géologique de Belgique 109, 113–22.Google Scholar
Ebert, J. 1993. Globale events im Grenz-Bereich Mittel-/Oberdevon. Göttinger Arbeiten Zur Geologie und Paläontologie 59, 1–106.Google Scholar
Elmi, S. & Ameur, M. 1984. Quelques environnements des faciès noduleux mésogéens. Geologica Romana 23, 13–22.Google Scholar
Flügel, E. 2004. Microfacies of Carbonate Rocks. Analysis, Interpretation and Application. Berlin, Heidelberg, NewYork: Springer Verlag.Google Scholar
Franke, W. & Walliser, O. H. 1983. Pelagic carbonates in the Variscan belt – their sedimentary and tectonic environments. In Intracontinental Fold Belts (eds Martin, H. & Eder, F. W.), pp. 77–92. Berlin & Heidelberg: Springer.Google Scholar
Girard, C. & Renaud, S. 2007. Quantitative conodont-based approaches for correlation of the Late Devonian Kellwasser anoxic events. Palaeogeography, Palaeoclimatology, Palaeoecology 250, 114–25.Google Scholar
Göddertz, B. 1987. Devonische Goniatiten aus SW-Algerien und ihre stratigraphische Einordnung in die Conodonten-Abfolge. Palaeontographica Abteilung A 197, 127–220.Google Scholar
Gouwy, S., Haydukiewicz, J. & Bultynck, P. 2007. Conodont-based graphic correlation of upper Givetian-Frasnian sections of the Eastern Anti-Atlas (Morocco). Geological Quarterly 51, 375–92.Google Scholar
Hinde, G. J. 1879. On conodonts from the Chazy and Cincinnati Group of the Cambro-Silurian, and from the Hamilton and Genesee-Shale Divisions of the Devonian, in Canada and the United States. Quarterly Journal of the Geological Society 35, 351–69.Google Scholar
Hüneke, H. 1995. Early Devonian (Emsian) to Late Devonian (Famennian) stratigraphy and conodonts of the Antoinettenweg section in the Lower Harz Mountains (Germany). Courier Forschungsinstitut Senckenberg 188, 99–131.Google Scholar
Hüneke, H. 2006. Erosion and deposition from bottom currents during the Givetian and Frasnian: response to intensified oceanic circulation between Gondwana and Laurussia. Palaeogeography, Palaeoclimatology, Palaeoecology 234, 146–67.Google Scholar
Ji, Q. & Ziegler, W. 1993. Lali section: an excellent reference section for Upper Devonian in south China. Courier Forschungsinstitut Senckenberg 157, 1– 183.Google Scholar
Johnson, J. G., Klapper, G. & Sandberg, C. A. 1985. Devonian eustatic fluctuations in Euramerica. Geological Society of America Bulletin 96, 567–87.Google Scholar
Kayser, E. 1889. Ueber einige neue oder wenig bekannte Versteinerungen des rheinischen Devons. Zeitschrift der Deutschen Geologischen Gesellschaft 41, 288–96.Google Scholar
Klapper, G. 1989. The Montagne Noire Frasnian (Upper Devonian) conodont succession. In Devonian of the World (eds McMillan, N. J., Embry, A. F. & Glass, A. F.), pp. 449–68. Calgary: Canadian Society of Petroleum Geologists, no. 14(3).Google Scholar
Klapper, G. 1990. Frasnian species of the Late Devonian conodont genus Ancyrognathus . Journal of Paleontology 64, 998–1025.CrossRefGoogle Scholar
Klapper, G. 2007 a. Frasnian (Upper Devonian) conodont succession at Horse Spring and correlative sections, Canning Basin, Western Australia. Journal of Paleontology 81, 513–37.Google Scholar
Klapper, G. 2007 b. Conodont taxonomy and the recognition of the Frasnian/Famennian (Upper Devonian) Stage Boundary. Stratigraphy 4, 67–76.CrossRefGoogle Scholar
Klapper, G., Feist, R., Becker, R. & House, M. R. 1993. Definition of the Frasnian/Famennian stage boundary. Episodes 16, 433–41.Google Scholar
Klapper, G., Feist, R. & House, M. R. 1987. Decision on the boundary stratotype for the Middle/Upper Devonian Series boundary. Episodes 10 (2), 97–101.Google Scholar
Klapper, G. & Foster, C. T. 1993. Shape analysis of Frasnian species of the Late Devonian conodont genus Palmatolepis . Journal of Paleontology 67, 1–33.Google Scholar
Lazreq, N. 1999. Biostratigraphie des conodontes du Givétien au Famennien du Maroc central - Biofacies et événement Kellwasser. Courier Forschungsinstitut Senckenberg 214, 1–111.Google Scholar
Mahboubi, A., Cornée, J. J & Girard, C. 2013 a. Biostratigraphie et évolution sédimentaire du Dévonien supérieur de la plate-forme occidentale saharienne la coupe de Marhouma sud, SO-algerien. 14ème Congrès Français de Sédimentologie. Paris, 257 pp.Google Scholar
Mahboubi, A. & Gatovsky, Y. 2014. Late Devonian conodonts and event stratigraphy in northwestern Algerian Sahara. Journal of African Earth Sciences, published online 16 October 2014, doi: 10.1016/j.jafrearsci.2014.10.004.Google Scholar
Mahboubi, A., Girard, C., Cornée, J. J. & Feist, R. 2013 b. Late Devonian sequences and biostratigraphy of the South Marhouma region, Beni Abbès, SW Algeria - Preliminary results. In International Field Symposium The Devonian and Carboniferous of Northern Gondwana, SDS joint field meeting (eds El Hassini, A., Becker, R. T. & Tahiri, A.), pp. 80. Document de l’institut Scientifique, Rabat, Memoir no. 27.Google Scholar
Massa, D., Combaz, A. & Manderschied, G. 1965. Observations sur les séries Siluro – Dévoniennes des confins algéro-marocains du Sud. Compagnie Française du Pétrole 8, 1–187.Google Scholar
Menchikoff, N. 1936. Etude géologique sur les confins algéro-marocains du Sud. Bulletin de la Société Géologique de France 6, 131–49.Google Scholar
Müller, K. J. & Müller, E. M. 1957. Early Upper Devonian (Independence) conodonts from Iowa, part 1. Journal of Paleontology 31, 1069–108.Google Scholar
Ovnatanova, N. S. 1976. Novye pozdnedevonskie konodonty Russkoy Platformy. Paleontologicheskiy Zhurnal 2, 106–15 (in Russian).Google Scholar
Ovnatanova, N. S., Kuzmin, A. & Menner, V. V. 1999. The succession of Frasnian conodont assemblage in the type section of the Southern Timan, Pechora Province (Russia). Bollettino della Società Paleontologica Italiana 37 (2–3), 349–60.Google Scholar
Pareyn, C. 1961. Les Massifs Carbonifères du Sahara Sud-Oranais. Paris: CNRS, Publications du Centre de Recherches Sahariennes, Série Géologie no. 1.Google Scholar
Sandberg, C. A. 1976. Conodont biofacies of late Devonian Polygnathus styriacus Zone in western United States. In Conodont Paleoecology (ed. Barnes, C. R.), pp. 171–86. Montreal: Geological Association of Canada, Special Paper no. 15.Google Scholar
Sandberg, C. A., Poole, F. G. & Johnson, J. G. 1989. Upper Devonian of Western United States. In Devonian of the World (eds McMillan, N. J., Embry, A. F. & Glass, D. J.), pp. 183–200. Calgary: Canadian Society of Petroleum Geologists, Memoir no. 14(1).Google Scholar
Sandberg, C. A., Ziegler, W., Dreesen, R & Butler, J. L. 1992. Conodont biochronology, biofacies, taxonomy and event stratigraphy around Middle Frasnian Lion Mudmound (F2h), Belgium. Courier Forschunginstitut Senckenberg 150, 1–87.Google Scholar
Sannemann, D. 1955. Beitrag zur Untergliederung des Oberdevons nach Conodonten. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 100, 324–31.Google Scholar
Schindler, E. 1990. Die Kellwasser-Krise (hohe Frasne-Stufe, Oberdevon). Göttinger Arbeiten zur Geologie und Pälaontologie 46, 1–115.Google Scholar
Schülke, I. 1995. Evolutive Prozesse bei Palmatolepis in der frühen Famenne-Stufe (Conodonta, Ober-Devon). Göttinger Arbeiten zur Geologie und Paläontologie 67, 1–108.Google Scholar
Schülke, I. 1999. Early Famennian conodont biostratigraphy of the stratotype area (Montagne Noire, Southern France). Bolletino della Società Paleontologica Italiana 37, 375–91.Google Scholar
Seddon, G. & Sweet, W. C. 1971. An ecologic model for conodonts. Journal of Paleontology 45 (5), 869–80.Google Scholar
Sobstel, M., Makowska–Haftka, M. & Racki, G. 2006. Conodont ecology in the Early–Middle Frasnian transition on the South Polish carbonate shelf. Acta Palaeontologica Polonica 51 (4), 719–46.Google Scholar
Stauffer, C. R. 1938. Conodonts of the Olentangy Shale. Journal of Paleontology 12, 411–43.Google Scholar
Walliser, O. H. 2000. The Jebel Mech Irdane section. Notes et Mémoires du Service Géolgique du Maroc 399, 57–62.Google Scholar
Wendt, J. & Belka, Z. 1991. Age and depositional environment of Upper Devonian (early Frasnian to early Famennian) black shales and limestones (Kellwasser facies) in the eastern Anti-Atlas, Morocco. Facies 25, 51–89.Google Scholar
Wendt, J., Kaufmann, B., Belka, Z., Klug, C. & Lubeseder, S. 2006. Sedimentary evolution of a Palaeozoic basin and ridge system: the Middle and Upper Devonian of the Ahnet and Mouydir (Algerian Sahara). Geological Magazine 143, 269–99.Google Scholar
Weyant, M. 1988. Relationship between Devonian and Carboniferous strata near the northern confines of the Bechar basin, Algeria. Courier Forschunginstitut Senckenberg 100, 235–41.Google Scholar
Wirth, M. 1967. Zur Gliederung des höheren Paläozoikums (Givet-Namur) im Gebiet des Quinto Real (Westpyrenäen) mit Hilfe von Conodonten. Neues Jahrbuch für Geologie und Paläontologie 127 (2), 179–244.Google Scholar
Wittekindt, H. 1966. Zur Conodontenchronologie des Mittel-Devons. Fortschritte in der Geologie von Rheinland und Westfalen 9, 621–46.Google Scholar
Wright, V. P. & Burchette, T. P. 1996. Shallow-water carbonate environments. In Sedimentary Environments: Processes, Facies, and Stratigraphy (ed. Reading, H. G.), pp. 325–94. Oxford: Blackwell Science.Google Scholar
Youngquist, W. 1945. Upper Devonian conodonts from the independence shale (?) of Iowa. Journal of Paleontology 19, 355–67.Google Scholar
Youngquist, W. 1947. A New Upper Devonian Conodont Fauna from Iowa. Journal of Paleontology 21, 95–112.Google Scholar
Ziegler, W. 1973. Polygnathus linguiformis linguiformis (gamma morphotype). In Catalogue of Conodonts (ed. Ziegler, W.). Stuttgart: E. Schweizerbart'sche Verlagsbuchhandlung, 463 pp.Google Scholar