Elemental analysis (TC, TOC, IC) and X-Ray diffraction (XRD) data from Core PS72/287-3 (Barrow Strait, Canadian Arctic Archipelago)

Core PS72/287-3 SL (74°15.95'N, 90°59.09'W; water depth 337 m) was recovered in Barrow Strait in the Canadian Arctic Archipelago during the Polarstern Expedition PS72 in 2008 (Jokat, 2009). The 463 cm long sedimentary section can be divided into two lithological units (Stein et al., 2009). Unit I (0-312 cm) is mainly composed of olive brown (upper 33 cm) and olive gray to (dark) grayish brown, partly bioturbated silty clay to sandy silty clay. Ice-rafted debris (IRD) > 2mm only occur in minor amounts, with minimum values (almost absence) between about 100 and 250 cm and increasing number in the uppermost 70 cm. Unit II (312-463 cm) dominantly consists of grayish brown, light grayish brown, and light gray to gray sandy silty clay and silty clay with common occurrence of dropstones. The occurrence of dropstones ranging in size from 0.5 to 7 cm in diameter, is the main difference to Unit I. Dropstones are especially enriched between 378 and 399 cm, between 412 and 428 cm, and in the lowermost part of the core, classifying the sediment as diamicton. Unit II probably represent the final stage of the last glaciation and/or the deglacial period. An extended ice sheet and its subsequent decay resulted in the formation of diamictons and large input of IRD at the core location. Unit I represents the post-glacial Holocene time interval when seasonally open-marine conditions were predominant (Stein et al., 2009).