Magnetic properties of gas hydrate-bearing sediments and their association with iron geochemistry in the Sea of Marmara, Turkey
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Fig. 2. Downcore magnetic parameter and geochemical trends. Fig. 3. Magnetic susceptibility versus temperature (χ-T) curves. Fig. 4. Hysteresis loops for samples from the two cores from the Sea of Marmara. Fig. 5. FORC diagrams and hysteresis ratios plotted on a Day plot. Fig. 6. Zero field-cooled (ZFC) and field-cooled (FC) curves.
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Magnetic property measurements, geochemical data in combination with electron microprobe imaging were the first systematically conducted on two cores from the Sea of Marmara. Authigenic greigite and pyrrhotite were confirmed in samples from the core from Western High, which was cored entirely with current seepages and gas hydrate distribution. This is most likely caused by the strong accumulation and upward fluids, including dissolved methane and high concentration of CO2 and heavy hydrocarbons.