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Development and Environmental Significance of an Eolian Sand Ramp of Last-Glacial Age, Central Iran

  • David S.G. Thomas (a1), Mark D. Bateman (a1), Daryoush Mehrshahi (a1) and Sarah L. O'Hara (a1)

A 25-m-thick section of mostly eolian sediment is exposed in the stream-cut flank of a sand ramp accumulated in a mountain saddle near Ardakan playa, central Iran. The well-sorted eolian sediments of the ramp contain talus beds and incipient paleosols. Morphology and bedding structures imply that southeasterly winds were primarily responsible for deposition of the eolian sand. Optical dating shows that the sand was deposited near the last glacial maximum within about 5000 yr. Surface stabilization, lack of surface scree, and the development of a stream cut between the mountain and the ramp show that sediment accumulation ceased after this time. The Siberian high pressure system may have been established over central Iran during the last glacial maximum, causing cooler temperatures and a prevalence of southeasterly winds. These colder, windier conditions would have led to frost shattering and eolian transport, both of which are not significant processes today but which are evident as past processes from the ramp sediments.

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M. D. Bateman and J. A. Catt , (1996). An absolute chronology for the raised beach and associated deposits at Sewerby, East Yorkshire U.K. Journal of Quaternary Science 11, 389399.

G. A. T. Duller , (1995). Luminescence dating of sediment using single ali-quots: Methods and applications. Radiation Measurements 24, 217226.

D. J. Huntley , D. I. Godfrey-Smith and M. L. W. Thewalt , (1985). Optical dating of sediments. Nature 313, 105107.

G. E. Hutchinson and U. M. Cowgill , (1963). Chemical examination of a core from Lake Zeribar, Iran. Science 140, 6769.

N. Lancaster, and V. P. Tchakerian , (1996). Geomorphology and sediments of sand ramps in the Mojave Desert. Geomorphology 17, 151165.

B. J. Luff and P. D. Townsend , (1993). High sensitivity thermolumines-cence spectrometer. Measurements in Science and Technology 4, 6571.

V. Mejdahl , (1987). Thermoluminescence dating of sediments. Radiation Protection Dosimetry 17, 219227.

H. M. Rendell and N. L. Sheffer , (1996). Luminescence dating of sand ramps in the Eastern Mojave Desert. Geomorphology 17, 187197.

S. Stokes, , D. S. G. Thomas and R. Washington , (1997). Multiple episodes of aridity in southern Africa since the last interglacial period. Nature 388, 154158.

D. S. G. Thomas , D. J. Nash , P. A. Shaw and C. Van der Post , (1993). Present day sediment cycling at witpan in the arid southwestern Kalahari Desert. Catena 20, 515527.

W. Van Zeist, and H. E. Wright , (1963). Preliminary pollen studies at Lake Zeribar, Zagros Mountains, southern Iran. Science 140, 6567.

H. E. J. Wright , (1980). Climatic change and plant domestication in the Zagros Mountains. Iran 18, 145148.

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Quaternary Research
  • ISSN: 0033-5894
  • EISSN: 1096-0287
  • URL: /core/journals/quaternary-research
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