Sedimentary record from the Canada Basin, Arctic Ocean: implications for late to middle Pleistocene glacial history
Linsen Dong1,2, Yanguang Liu1,2, Xuefa Shi1,2, Leonid Polyak3, Yuanhui Huang1,2, Xisheng Fang1, Jianxing Liu1,2, Jianjun Zou1,2, Kunshan Wang1,2, Fuqiang Sun1, and Xuchen Wang41Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China 2Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266 061, China 3Byrd Polar and Climate Research Center, The Ohio State University, 43210, USA 4Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Qingdao 266100, China
Received: 27 Dec 2016 – Accepted for review: 12 Jan 2017 – Discussion started: 16 Jan 2017
Abstract. Sediment core ARC4–BN05 collected from the Canada Basin, Arctic Ocean, covers the late to middle Quaternary (Marine Isotope Stages (MIS) 1–15, ca. 0.5–0.6 Ma) as estimated by correlation to earlier proposed Arctic Ocean stratigraphies and AMS 14C dating of the youngest sediments. Detailed examination of clay and bulk mineralogy along with grain size, content of Ca and Mn, and planktonic foraminiferal numbers in core ARC4–BN05 provides important new information about sedimentary environments and provenance. We use increased contents of coarse debris as an indicator of glacier collapse events at the margins of the western Arctic Ocean, and identify the provenance of these events from mineralogical composition. Notably, peaks of dolomite debris, including large dropstones, track the Laurentide Ice Sheet (LIS) discharge events to the Arctic Ocean. Major LIS inputs occurred during the stratigraphic intervals estimated as MIS 3, intra-MIS 5 and 7 events, MIS 8, and MIS 10. Inputs from the East Siberian Ice Sheet (ESIS) are inferred from peaks of smectite, kaolinite, and chlorite associated with coarse sediment. Major ESIS sedimentary events occurred in the intervals estimated as MIS 4, MIS 6 and MIS 12. Differences in LIS vs. ESIS inputs can be explained by ice-sheet configurations at different sea levels, sediment delivery mechanisms (iceberg rafting, suspension plumes, and debris flows), and surface circulation. A long-term change in the pattern of sediment inputs, with an apparent step change near the estimated MIS 7/8 boundary (ca. 0.25 Ma), presumably indicates an overall glacial expansion at the western Arctic margins, especially in North America.
Dong, L., Liu, Y., Shi, X., Polyak, L., Huang, Y., Fang, X., Liu, J., Zou, J., Wang, K., Sun, F., and Wang, X.: Sedimentary record from the Canada Basin, Arctic Ocean: implications for late to middle Pleistocene glacial history, Clim. Past Discuss., doi:10.5194/cp-2016-139, in review, 2017.