DATE2016-05-31 11:08:11
AUTHORSSena Akçer-Ön (1), Zeki Bora Ön (1), Namik Cagatay (2), Kursad Kadir Eris (2), Mehmet Sakinc (3), Sabine Wulf (4,5), Cahit Helvaci (6), Dursun Acar (2), İbrahim Gündogan (6), Serkan Akkiraz (7), Ümmühan Sancar (2), Javier Garcia Veigas (8), İliya Bauchi Danladi (1), Rana Salihoglu (1), Yesim Büyükmeriç (9), Oona Appelt (10), Ömer Lütfi Sen (3), Mehmet Özdogan (11)
  1. Mugla Sitki Kocman University, Geological Engineering Dept. Mugla (Turkey)
  2. Istanbul Technical University, Emcol And Geological Engineering Dept Istanbul (Turkey)
  3. Istanbul Technical University, Avrasya Institute Of Earth Sciences Istanbul (Turkey)
  4. Senckenberg Research Institute And Natural History Museum, Evolution And Climate Frankfurt (Germany)
  5. Heidelberg University, Institute Of Earth Sciences Heidelberg (Turkey)
  6. Dokuz Eylül University, Geological Engineering Dept Izmir (Turkey)
  7. Dumlupinar University, Geological Dept. Kütahya (Turkey)
  8. Universitat Barcelona, Geologia Sedimentaria Barcelona (Spain)
  9. Bülent Ecevit University, Geological Engineering Dept. Zonguldak (Turkey)
  10. Helmholtz Centre Potsdam, Gfz German Research Centre For Geosciences Potsdam (Germany)
  11. Istanbul University, Archaeology Dept. Istanbul (Turkey)
ABSTRACTLake sediments are commonly used for environment studies and reconstruction of past climates. High resolution multiproxy analyses in undisturbed lake sediments can provide information about climatic changes on annual to seasonal scales. Salda is a tectonic lake at 1200 m altitude and located in the western Burdur province, SW Turkey. It is an alkaline lake, where high precipitation of stromatolites and hydromagnesite processes are observed. The lake is almost completely surrounded by ophiolitic rocks and by a small area of dolomitic limestones in the west. The terminal Salda Lake is fed only by ephemeral streams and ground water. The climate of the region is classified as Mediterranean. According to the Burdur Meteorology station data, between 1971 and 1988; the average annual minimum and maximum temperatures are 1°C and 20° C, respectively, and the average precipitation and evapotranspiration are 435 mm and 637 mm. For the purpose of understanding the Holocene climate variability of Western Anatolia, a 370 cm and a 480 cm long undisturbed piston core were recovered from Lake Salda at a water depth of 22 m and 30 m, respectively. Cores were scanned at a 1 mm resolution for XRF relative elemental composition and Magnetic Susceptibility (MS) measurements, and sampled at 5 cm resolution for TOC/TIC, diatom, pollen, mollusk and stable oxygen and carbon (ostracod shells) analysis. XRD, SEM, major and trace elements were also analyzed from different levels of the cores. Age models of the cores were established on the basis of AMS-14C dates and tephrochronology. The results of major element glass analyses of a visible tephra layer in approximately 300 cm depth identified the Minoan tephra from Thera volcano (Santorini), which is dated on land at ~3560±15 cal yr BP .A wood remain and ostracod shells at 64 cm from the other core dated as 1740±30 14C BP and 2400±30 14C BP, respectively, allowing the estimation of a reservoir age in Lake Salda of ca. 660±42 years. The cores covers last 5000 cal yrs BP, and at ca 3500 cal yrs BP the chemistry of the lake has changed appearently. The preliminary results of the multi-proxy analysis suggest that the climate of the region was cooler/drier between 4800-4100 and 3500-2600 cal yr BP, and after 2600 cal yr BP until today warmer/wetter conditions changed gradually to a cooler/dyer climate again. This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) project no. 113Y408.