Sedimentology and stratigraphic sequence of the Gavkhoni playa lake, SE Esfahan, Iran

• Autores: Hamid R. Pakzad, Farajoliah Fayazi
• Localización: Carbonates and Evaporites, ISSN 0891-2556, Vol. 22, Nº. 2, 2007, págs. 93-100
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • The Gavkhoni playa lake is surroundedby alluvial fan deposits to the north, south and east and the Varzaneh aeolian sand field to the west. Four major sub-environments including: sand flat/saline sand flat, sand beach,mud fiat/saline mud flat and salt pan and sevenmajorfacies can be recognized in this playa lake. Sandflat resultsfrom transportation of sand by wind from the adjacent sand dunes. The mudfiat reflectsrapid deposition on a lower flood plainduringwet, shortlyafter sheetfloods. The salinemud flat and salt pan is as a result of three stages: flooding, evaporation and desiccation. After flooding, whenthe shallowephemeral lake becomes concentrated by evaporation, salinemud fiat is formed and finally the formation of salt pan starts.

    Regarding the sub-environments it is supposed that climatic changes played an important role in sedimentation. During periods of increased run off, sedimentation of alluviallfluvial occurred and water table was raised at the playa lake. During periods of reduced run-off and falling water. table, the salinemud flat and salt pan were formedand wind erosion of lluvialdeposits resulted in formation of sand dune and sandfiat.