Abstract
International Continental Scientific Drilling Program (ICDP) drilled a complete succession of the lacustrine sediment sequence deposited during the last ~500,000 years in Lake Van, Eastern Anatolia (Turkey). Based on a detailed seismic site survey, two sites at a water depth of up to 360 m were drilled in summer 2010, and cores were retrieved from sub-lake-floor depths of 140 m (Northern Basin) and 220 m (Ahlat Ridge). To obtain a complete sedimentary section, the two sites were multiple-cored in order to investigate the paleoclimate history of a sensitive semi-arid region between the Black, Caspian, and Mediterranean seas. Further scientific goals of the PALEOVAN project are the reconstruction of earthquake activity, as well as the temporal, spatial, and compositional evolution of volcanism as reflected in the deposition of tephra layers. The sediments host organic matter from different sources and hence composition, which will be unravelled using biomarkers. Pathways for migration of continental and mantle-derived noble gases will be analyzed in pore waters. Preliminary 40Ar/39Ar single crystal dating of tephra layers and pollen analyses suggest that the Ahlat Ridge record encompasses more than half a million years of paleoclimate and volcanic/geodynamic history, providing the longest continental record in the entire Near East to date. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.14.02.2012" target="_blank">10.2204/iodp.sd.14.02.2012</a>
Highlights
Background andMotivation ment sequence deposited during the last ~500,000 years in Lake Van, Eastern Anatolia (Turkey)
Further scientific goals of the PALEOVAN project are the reconstruction of earthquake activity, as well as the temporal, spatial, and compositional evolution of volcanism as reflected in the deposition of tephra layers
A major benefit of choosing Lake Van as a drill site was the recurrence rates of such events and to support seismic likelihood of recovering several hundred tephra layers from hazard studies, long paleoseismic records are needed that the active Nemrut and Süphan volcanoes towering Lake Van document the succession of strong earthquakes and past (Fig. 1), which would provide a tephrostratigraphic frameseismic activities for this tectonically active area
Summary
38°40'N marine isotopic record based on tuning to astronomical parameters, and showed that. A major benefit of choosing Lake Van as a drill site was the recurrence rates of such events and to support seismic likelihood of recovering several hundred tephra layers from hazard studies, long paleoseismic records are needed that the active Nemrut and Süphan volcanoes towering Lake Van document the succession of strong earthquakes and past (Fig. 1), which would provide a tephrostratigraphic frameseismic activities for this tectonically active area. The long profile from Lake Van will allow determination of the in situ terrestrial He gradient as a function of depth within a sediment column of several hundred meters These data will provide the first direct insights into the transport processes of crustal and mantle He through the uppermost layers of the crust and improve the cur-. Rent understanding of terrestrial fluid transport within the continental crust
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