Ice sheet controls on fine-grained deposition at the southern Mendeleev Ridge since the penultimate interglacial
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Ice sheet controls on fine-grained deposition at the southern Mendeleev Ridge since the penultimate interglacial Liming Ye1, 2*, Xiaoguo Yu1, 2, Weiyan Zhang1, 2, Rong Wang1, 2 1 Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China 2 Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
Received 15 October 2019; accepted 11 December 2019 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract
Clay minerals deposited at the southern Mendeleev Ridge in the Arctic Ocean have a unique provenance, which can be used to reconstruct changes in the local sedimentary environment. We show that sediments in core ARC7E23 record high-frequency changes in clay minerals since the penultimate interglacial. The clay minerals, grain size, and ice-rafted debris indicate the extent of the East Siberia Ice Sheet (ESIS). During the glacial periods of Marine Isotope Stage 2 (MIS2) and MIS4, the southern Mendeleev Ridge was likely covered by an ESIS-extended ice shelf, blocking almost all sediment input from the Canadian Arctic and Laptev Sea, but allowing transport of fine-grained sediments from the East Siberian and Chukchi Sea shelves. After ESIS retreat, the Beaufort Gyre and Transpolar Drift became the primary transport mechanism for the distally sourced sediments. Climate conditions in MIS3 enhanced both the oceanic circulation and sediment transport. Key words: Arctic Ocean, Mendeleev Ridge, East Siberian Ice Sheet, clay minerals Citation: Ye Liming, Yu Xiaoguo, Zhang Weiyan, Wang Rong. 2020. Ice sheet controls on fine-grained deposition at the southern Mendeleev Ridge since the penultimate interglacial. Acta Oceanologica Sinica, 39(9): 86–95, doi: 10.1007/s13131-020-1649-2
1 Introduction Since the Mid-Pleistocene Transition, Arctic ice sheets have been sensitive to global climatic changes with an eccentricity period of 100 ka, and have also been involved in a series of rapid climate changes, such as the Younger Dryas (YD) event (Berger and Jansen, 1994; Bond et al., 1997; Condron and Winsor, 2012). Planetary albedo, ocean circulation, and water balance are directly related to the Arctic ice sheets and its extended ice shelf (Clark et al., 1999, 2001; Zachos et al., 2001). The East Siberian Ice Sheet (ESIS) was proposed to have covered the southern Mendeleev Ridge in glacial periods, and sedimentary records near the ridge can reveal its evolution through time (Fig. 1; Jakobsson et al., 2016; Niessen et al., 2013; Stein et al., 2017). Unlike glacial landforms, sedimentary records can provide a basis for ESIS identification and its spatial distribution through time (Polyak et al., 2007). Given the widespread sedimentary hiatuses associated with glacial expansion and poor preservation of older glacial landforms on continental shelves, it is difficult to determine the evolution of the ESIS (Dove et al., 2014). However, eroded sediments from shallow-water shelves or submarine highs were transported into deeper
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