BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION, vol.140, pp.1-18, 2010 (Journal Indexed in ESCI)
Article / Article
Title of Journal :
BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION
Sediment cores BUC-10A and IZ-30 located on the North Anatolian Fault Zone (NAFZ), 12 km south of Büyükçekmece and Ýzmit Gulf in the eastern part of the Sea of Marmara, respectively, were studied to investigate tectonics and paleo-oceanographic processes, using sedimentological and geochemical methods. Total inorganic carbon (TIC as total calcium carbonate) and total organic carbon (TOC) contents in core BUC-10A range between 12.1-34.3 and 0.5-4.1 dry wt. %, respectively. The organic matter-rich sapropel unit was identified
between 1.60 and 2.43 m below sea floor (bsf) in this core. The concentration ranges of the metals in core BUC-10A were: Cr: 55-96, Cu: 21-37, Ni: 63 39-74, Mn: 345-693, Pb: 19-34, Zn: 79-143 ppm and Fe: 2.30-3.15 dry wt. %. The concentration ranges of TOC, TIC, Cr, Cu, Fe, Ni, Mn, Pb and Zn in core ÝZ-30 were 0.40-1.70 %, 0.25-31%, 39-87 ppm, 13-32 ppm, %2.10-4.80, 18-41 ppm, 315-528 ppm, 7-21 ppm and 78-185 ppm, respectively. Chalcophile element (Fe, Mn, Cu, Pb, and Zn) concentrations in cores ÝZ-30 and BUC-10A give no evidence of hydrothermal activity. A debris flow characterized in core ÝZ-30 and dated 3276±48 a (calendar) before present (BP) was most likely triggered by tectonic activity in the Ýzmit Gulf. Sediments of 49.5 mbsf palaeoshoreline dated 9364±64 a BP was also identified in the same core from the İzmit Gulf.