|TITLE||LATE PLEISTOCENE-HOLOCENE CLIMATE VARIABILITY FROM LAKE HAZAR (SE TURKEY) SEDIMENTARY RECORDS|
|AUTHORS||Sena Akcer-Ön (1)|Kadir Eris (2)|Tugce Nagihan Arslan (2)|Zeki Bora Ön (1)|Dursun Acar (3)|
- Mugla Sitki Koçman University, Engineering Faculty, Geology Engineering Department, Mugla, Turkey
- Firat University, Engineering Faculty, Geology Engineering Department, Elazig, Turkey
- Istanbul Technical University Faculty of Mines, EMCOL, Istanbul, Turkey
|ABSTRACT||Lake Hazar (Southeastern Turkey), which is located on the East Anatolian Fault Zone, is an oligotrophic, alkaline (avg. pH 9.1), tectonic lake. Lake Hazar is an elongated intramontane basin at approximately 1500 m altitude. The present climate of the region is Continental Mediterranean which is similar with Mediterranean semiarid subtropical and the summer- winter temperature differences are high.
This study focuses on climatic and environmental sedimentary records of the last 15 ka in Lake Hazar. For this purpose a 3.48 m long core (Hz11P03) is recovered at 50 m water depth from west of the lake.
Hz11P03 was analyzed for physical properties at 20 mm resolution using Multi Sensor Core Logger (MSCL), multi-element geochemical analysis at 10 mm resolution using XRF core scanner. The core is sampled at 25 mm intervals for ostracoda analysis. The ostracoda shells in the sand size fraction of the sediment samples were identified under binocular microscope and suitable “Candona neglecta” species were picked and analyzed for the stable oxygen and carbon isotope analysis. The sedimentary sequence has been dated by 6 AMS radiocarbon ages, obtaining from mollusc, ostracoda shells and plant materials. The radiocarbon ages were calibrated to calendar year using Calib. 6.0 software.
As a result of multiproxy data analysis, the wetter warm spells Bolling-Allerod, an abrupt Late Pleistocene-Holocene transition, Medieval Climate Optimum and dryer cold spells; Younger dryas, 8.2 ka event, Little Ice Age are observed in sediment records and also the results are well correlated with the Sofular Cave (Zonguldak, N Turkey) high resolution speolethem stable carbon isotope data.|