Subaqueous Siliciclastic Stromatolites: A Case History from Late Miocene Beach Deposits in the Sorbas Basin of SE Spain

  • Juan C. Braga
  • José M. Martín


Agglutination of particles is a major process involved in microbial dome formation. Early lithification by biogenic precipitation or early cementation is also essential for dome accretion and preservation. Although it is possible for agglutinated grains to be siliciclastic, reports of siliciclastic microbial domes are scarce. Early lithification of microbial mats seems to have taken place only rarely in settings with terrigenous influx in marine environments. The few recorded examples of siliciclastic stromatolites and thrombolites occur, however, in a wide range of sedimentary environments, from coastal lakes to relatively deep subtidal settings, and from the Cambrian to the late Cenozoic.

We describe a new example of siliciclastic stromatolites in a Messinian (Late Miocene) post-evaporitic unit (the Sorbas Member) near Sorbas town in the Sorbas Basin of Almeria, southern Spain. These stromatolites occur in beach deposits. Stromatolite domes formed at the transition from the lowermost beach shore-face to the shelf. They are made up of dense, peloidal, clotted and bushy micrite, interpreted as microbial precipitates, together with siliciclastic particles which constitute up to 40% of the rock volume. Within a single stromatolite bed there is variation in dome composition and morphology. Proximal domes contain sand-grade siliciclastics, distinct lamination and high synoptic relief with steep sides. Downslope, they grade into large, flattened, silty stromatolites with gentle sides, intercalating with silt lenses. Microbial mats developed at the bottom of the lowermost part of the beach, but were inhibited by stronger wave energy at shallower settings. Deeper waters on the shelf were probably too dark for mat growth and dome formation.


Transgressive System Tract Microbial Carbonate Beach Deposit Clot Micrite Dome Form 
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  1. Bertrand-Sarfati J (1994) Siliciclastic-carbonate stromatolite domes in the Early Carboniferous of the Ajjers Basin (eastern Sahara, Algeria). In: Bertrand-Sarfati, Monty CLP (eds) Phanerozoic Stromatolites II. Kluwer, Dordrecht, pp 395–419Google Scholar
  2. Braga JC, Martin JM, Riding R (1995) Controls on microbial dome fabric development along a carbonate-siliclastic shelf-basin transect, Miocene, SE Spain. Palaios 10: 347–361Google Scholar
  3. Cameron B, Cameron D, Jones JR (1985) Modern algal mats in intertidal and supratidal quartz sands, northeastern Massachusetts, USA. In: Curran HA (ed) Biogenic structures: their use in interpreting depositional environments. SEPM Special Publication 35, pp 211–223Google Scholar
  4. Dabrio CJ, Polo MD (1995) Oscilaciones eustaticas de alta frecuencia en el Neôgeno superior de Sorbas ( Almeria, sureste de Espana ). Geogaceta 18: 75–78Google Scholar
  5. Dabrio CJ, Martin JM, Megias, AG (1985) The tectosedimentary evolution of Mio-Pliocene reefs in the Province of Almeria. In: Milà MD, Rosell J (eds) 6th European Regional Meeting of Sedimentologists, Excursion Guidebook, Lleida, Spain, pp 269–305Google Scholar
  6. Davis RA Jr (1966) Willow River dolomite: Ordovician analogue of modern algal stromatolite environments. J Geol 74: 908–923CrossRefGoogle Scholar
  7. Davis RA Jr (1968) Algal stromatolites composed of quartz sandstone. J Sediment Petrol 38: 953–955CrossRefGoogle Scholar
  8. Fornôs JJ, Pomar L (1984) A composite sequence of alluvial-fan coastal and sea-cliff deposits in the upper Miocene of the Cabrera Island ( Balearics, Spain). Publ Geol Univ Autôn Barcelona 20: 85–95Google Scholar
  9. Gerdes G, Krumbein WE (1987) Biolaminated deposits. Lecture Notes in Earth Sciences 9. Springer, Berlin Heidelberg New York, 183 ppGoogle Scholar
  10. Grant CW (1991) Lateral and vertical distributions of textural features of filamentous bacterial (Beggiatoa) mats in Santa Barbara Basin, California. Bull Am Assoc Petrol Geol 75: 585Google Scholar
  11. Grant J (1988) Intertidal bedforms, sediment transport, and stabilization by benthic microalgae. In: de Boer PL et al. (eds) Tide-influenced sedimentary environments and facies. Riedel, Dordrecht, pp 499–510CrossRefGoogle Scholar
  12. Haq BU, Hardenbol J, Vail PR (1987) Chronology of fluctuating sea levels since the Triassic. Science 235: 1156–1167CrossRefGoogle Scholar
  13. Harwood G (1990) ‘Sandstone stromatolites’-An example of algal-trapping of sand grains from the Permian Yates Formation, New Mexico, USA. Sediments 1990.13th International Sedimentological Congress, Nottingham, England, Abstracts of Posters, p 97Google Scholar
  14. Logan BW (1961) Cryptozoon and associate stromatolites from the Recent, Shark Bay, Western Australia. J Geol 69: 517–533.CrossRefGoogle Scholar
  15. Martin JM, Braga JC (1994) Messinian events in the Sorbas basin of southeastern Spain and their implications in the recent history of the Mediterranean. Sediment Geol 90: 257–268.CrossRefGoogle Scholar
  16. Martin JM, Braga, JC (1996) Tectonic signals in the Messinian stratigraphy of the Sorbas basin (Almeria, SE Spain). In: Friend PJ, Dabrio CJ (eds) Tertiary basins of Spain. The stratigraphic record of crustal kinematics. Cambridge University Press, Cambridge, pp 387–391CrossRefGoogle Scholar
  17. Martin JM, Braga JC, Riding R (1993) Siliciclastic stromatolites and thrombolites, late Miocene, S.E. Spain. J Sediment Petrol 63: 131–139Google Scholar
  18. Meadows A, Meadows, PS, Muir Wood D, Murray JMH (1994) Microbiological effects on slope stability: an experimental analysis. Sedimentology 41: 423–435CrossRefGoogle Scholar
  19. Park RA (1977) The preservation potential of some recent stromatolites. Sedimentology 24: 485–506CrossRefGoogle Scholar
  20. Paterson DM (1989) Short-term changes in the erodability of intertidal cohesive sediments related to the migratory behaviour of epipelic diatoms. Limnol Oceanogr 34: 223–234CrossRefGoogle Scholar
  21. Riding R (1991) Classification of Microbial Carbonates. In: Riding R (ed) Calcareous algae and cyanobacteria. Springer, Berlin Heidelberg New York, pp 21–51CrossRefGoogle Scholar
  22. Roep ThB, Beets DJ, Dronkert H, Pagnier H. (1979) A prograding coastal sequence of wave-built structures of Messinian age, Sorbas, Almeria, Spain. Sediment Geol 22: 135–163Google Scholar
  23. Ruegg GJH ( 1964. ) Geologische onderzoekingen in het bekken van Sorbas, S Spanje. Amsterdam Geological Institute, University of Amsterdam, Holland, 64 ppGoogle Scholar
  24. Soudry D, Weissbrod T (1995) Morphogenesis and facies relationships of thrombolites and siliciclastic stromatolites in a Cambrian tidal sequence ( Elat area, southern Israel ). Palaeogeogr Palaeoclimatol Palaeoecol 114: 339–355Google Scholar
  25. Schwarz HE, Einsele G, Herm D (1975) Quartz-sandy, grazing-contoured stromatolites from coastal embayments of Mauritania, West Africa. Sedimentology 22: 539–561Google Scholar

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© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Juan C. Braga
    • 1
  • José M. Martín
    • 1
  1. 1.Departamento de Estratigrafia y PaleontologiaUniversidad de GranadaGranadaSpain

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