Holocene sedimentary history of South Danamandıra Lake: a peatland in west of İstanbul, Çatalca Peninsula, NW Turkey

Turkish Journal of Earth Sciences

article

YAKUPOĞLU, NURETTİN¹  SABUNCU, ASEN¹  ALTUN, DAMLA ŞAHİN²  KARAÖZ, MUSTAFA ÖMER²  ÇAĞATAY, MEMET NAMIK¹  MAKAROĞLU, ÖZLEM³  KÜÇÜKDEMİRCİ, MELDA³  KARLIOĞLU, NURGÜL⁴  ACAR, DURSUN¹  GÜREL, ALİ⁵  DAĞDEVİREN, RÜYA YILMAZ⁴ 

[1] EMCOL Research Centre and Geological Engineering Department, Faculty of Mining, İstanbul Technical University;Department of Soil Science and Ecology, İstanbul University-Cerrahpaşa, Faculty of Forestry, Bahçeköy Campus;Department of Geophysical Engineering, İstanbul University-Cerrahpaşa, Büyükçekmece Campus;Department of Forest Botany, İstanbul University-Cerrahpaşa, Faculty of Forestry, Bahçeköy Campus;Marmara Forestry Research Institute, Fatih Forest Campus

关键词: Danamandıra Lake;    Çatalca;    Holocene;    peatland;    environmental magnetism;    geochemical properties;    geophysical survey;   

DOI  :  10.55730/1300-0985.1809

学科分类：地球科学(综合)

来源: Scientific and Technical Research Council of Turkey - TUBITAK

【 摘 要 】

This study investigates the sedimentological evolution of the South Danamandıra Lake (SDL) lake in Çatalca Peninsula, 70 km west of İstanbul, using Georadar data and multiproxy analyses of five sediment cores. The lake is a 1.3-m deep, endorheic freshwater peatland, heavily colonised by common reed (Phragmites sp.). The multiproxy core investigations include a lithological core description and environmental magnetism, physical properties (gamma density and magnetic susceptibility), geochemical elemental, pollen and radiocarbon dating analyses. The lithological sequence in the lake consists of an upper peat unit and a lower sand-silt-clay unit. The peat unit is characterized by lower magnetic susceptibility, density and lithophile elements (K, Fe, Ti, and Zr) concentrations than the sand-silt-clay unit. Overall interpretation of the multiproxy data and the age-depth model suggest that the SDL was formed in a shallow depression of a fluvial channel at ca 10.9 cal kyr BP, and became a eutrophic lake at 8.1 cal kyr BP during the early Holocene warm period. Redox-sensitive element (i.e. Mn) distribution and mineral magnetic properties indicate that the peat unit has accumulated under anoxic conditions below a thin oxic surficial layer. Increase in the Taraxacum, Asteraceae, and Poaceae pollen percentages, together with high siliciclastic inputs in the lake, indicate that anthropogenic influence in the area started at 5.4 cal kyr BP.

【 授权许可】

Unknown