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Quaternary environmental change in Cyrenaica evidenced by U-Th, ESR and OSL dating of coastal alluvial fan sequences

  • John S. Rowan (a1), Stuart Black (a2), Mark G. Macklin (a3), Brian J. Tabner (a4) and John Dore (a5)...


The coastal alluvial fan sequences of Cyrenaica are important archives of environmental change data, but hitherto relatively little has been known about their formative processes and rates. The Wadi Zewana coastal fan near Tolmeita was studied and a range of dating techniques (U-Th, ESR and OSL) applied to selected components of the stratigraphy. The sequence spans the last two global glacial periods separated by an Interglacial. Cemented alluvial fan gravel units yielded U-Th leachate-residue ages of 201 ± 18 ka, 179 ± 15 ka and 138 ± 8 ka respectively. The fan toe units are interdigitated with bioclastic beach rock deposits dated to 150 ± 10.9 ka corresponding to an Interglacial high stand in sea level and marine recession sequence featuring transgressive lag gravels, beach sand and cemented aeolian dunes dated to 121 ± 8 ka. Within the Wadi Zewana catchment a complex cut and fill history is evidenced. Aggradation phases dated to 76 ± 4 ka, 42.1 ± 5.1 ka and 12.5 ± 1.5 ka are broadly coincident with global glacials and stadials, whilst during the Last Interglacial and successive interstadials the drainage system underwent entrenchment, manifested on the coastal plain as telescopic fan segmentation and associated fan head trenching.



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Anketeil, J. M. and Ghellali, S. M. 1991. Quaternary fluvio-aeolian sand/silt and alluvial gravel deposits of northern Libya-event stratigraphy and correlation. Journal of African Earth Sciences 13: 457–69.
Anketell, J. M. and Ghellali, S. M. 1995. Quaternary fluvio-aeolian sand/silt and alluvial gravel deposits of northern Libya-event stratigraphy and correlation. In: Lewin, J., Macklin, M. G. and Woodward, J. C. (eds.), Mediterranean Quaternary River Environments. Balkema, Rotterdam: 7995.
Belknap, D. F. 1999. Sea-level lowstand in the eastern Mediterranean: Late Pleistocene coastal terraces offshore northern Israel. Journal of Coastal Research 15: 399412.
Bruckner, H. 1986. Man's impact on the evolution of the physical environment in the Mediterranean region in historical times. GeoJournal 13: 717.
Bull, W. B. 1991. Geomorphic Responses to Climatic Change, Oxford.
Clark, M. L., Rendell, H. M. and Wintle, A. G. 1999. Quality assurance in luminescence dating. Geomorphology 29: 173185.
Fuller, I. C., Macklin, M. G., Lewin, J., Passmore, D. G. and Wintle, A. G. 1998. River response to high-frequency climate oscillations in southern Europe over the past 200 ky. Geology 26: 275278.
Gilbertson, D. D. and Chisholm, N. W. T. 1996. ULVS XXVIII: Manipulating the Desert Environment: ancient walls, floodwater farming and territoriality in the Tripolitanian pre-desert of Libya. Libyan Studies 27: 1752.
Goni, M. F. S., Eynaud, F., Turon, J. L. and Shackleton, N. J. 1999. High resolution palynological record off the Iberian margin: direct land-sea correlation for the Last Interglacial complex. Earth and Planetary Science Letters 171: 123–37.
Goudie, A. 1992. Environmental Change (3rd edition), Oxford.
Grun, R. 1989. Electron spin resonance (ESR) dating. Quaternary International 1: 65109.
Harvey, A. M., Silva, P. G., Mather, A. E., Goy, J.-L., Stokes, M. and Zazo, C. 1999. The impact of Quaternary sea-level and climate change on coastal alluvial fans in the Cabo de Gata ranges, southeast Spain. Geomorphology 28: 122.
Hey, R. W. 1968. The Quaternary geology of the Jabal Al Akhdar coast. In: Barr, F.T. (ed), Geology and Archaeology of Northern Cyrenaica, Libya. Petroleum Exploration Society of Libya. 10th Annual Field Conference. Tripoli: 159–65.
Hillaire-Marcel, C., Gariépy, C., Ghaleb, B., Goy, J.-L., Zazo, C. and Barceló, J.C. 1996. U-series measurement in Tyrrhenian deposits from Mallorca - further evidence for two last-interglacial high sea levels in the Balearic Islands. Quaternary Science Reviews 15: 5362.
Ivanovich, M. and Harmon, R. S. 1992. Uranium Series Disequilibrium Applications to Environmental Problems, Oxford.
Kallel, N., Duplessy, J.-C., Labeyrie, L.Fontegne, M., Paterne, M. and Montacer, M. 2000. Mediterranean pluvial periods and sapropel formation over the last 200,000 years. Palaeogeography, Palaeoclimatology, Palaeoecology 157: 4558.
Kelly, M., Black, S. and Rowan, J. S. 2000. A calcrete-based U-Th chronology for landform evolution in the Sorbas basin, southeast Spain. Quaternary Science Review 19: 9951010.
Klitzsch, E. 1968. Outline of the geology of Libya. In: Barr, F.T. (ed), Geology and Archaeology of northern Cyrenaica, Libya. Petroleum Exploration Society of Libya. 10th Annual Field Conference. Tripoli, 7178.
Kraeling, C.H. 1962. Ptolemais, City of the Libyan Pentapolis, Chicago.
Lewin, J., Macklin, M. G. and Woodward, J. C. (eds.) 1995. Mediterranean Quaternary River Environments, Rotterdam.
McBurney, C. B. M. and Hey, R. W. 1955. Pre-history and Pleistocene Geology in Cyrenaican Libya, Cambridge.
Machette, M. N. 1985. Calcitic soils and calcretes of the southwestern United States. In: Weide, D. L. and Faber, M. L. (eds.) Soils and Quaternary geology of the southwestern United States. (Geological Society of America Special Paper 203): 121.
Nemec, W. and Postma, G. 1993. Quaternary alluvial fans in southwestern Crete: sedimentation processes and geomorphic evolution. In: Marzo, M. and Puigdefabregas, C (eds.) Alluvial Sedimentation (International Association of Sedimentologists, Special Publication 17): 235–76.
Rendell, H. M. and Sheffer, N. L. 1996. Luminescence dating of sand ramps in the Eastern Mojave Desert. Geomorphology, 17: 187–97.
Rose, J. and Meng, X. 1999. River activity in small catchments over the last 140 ka, North-east Mallorca, Spain. In: Brown, A. G. and Quine, T. A. (eds.), Fluvial Processes and Environmental Change, Chichester: 91102.
Sestini, G. 1984. Tectonic and sedimentary history of the NE African Margin (Egypt, Libya). In: Dixon, J. E. and Robertson, A. H. F. (eds.), Geological evolution of the eastern Mediterranean (Geological Society Special Publications), Oxford: 161–75.
Vita-Finzi, C. 1969. The Mediterranean Valleys, Cambridge.
Wild, M. T., Tabner, B. J. and Macdonald, R. 1999. ESR dating of quartz phenocrysts in some rhyolitic extrusive rocks using Al and Ti impurity centres. Quaternary Science Reviews 18: 15071514.
Woodward, J. C. 1995. Archaeology and human-river interactions. In: Lewin, J., Macklin, M. G. and Woodward, J. C. (eds.) Mediterranean Quaternary River Environments, Rotterdam: 99102.


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