Sedimentology, mineralogy, and geochemistry results of core Arc7-E25 from southern Mendeleev Ridge, Arctic Ocean@en

The 320 cm long gravity core E25 (Arc7-E25, 179.4°E, 79.0°N; 1200 m) was retrieved from the southernmost Mendeleev Ridge during the 7th cruise of the Chinese Arctic expedition on the R/V Xue Long in 2016. In combination with the 14C ages, U-Th series measurements analyzed at Geotop-UQAM in 2019 have been used to set up the chronostratigraphy. In addition, TOC and its 13C, grain size distribution, and bulk mineralogy have also been analyzed to evaluate the resilience of the East Siberian Ice Shelf/Sheet and to provide a distinct paleoceanographic view of the western Arctic Ocean.2016年，中国北极科考队搭乘“雪龙”号科考船（R/V Xue Long）执行第7次科考航次时，从最南端的门捷列夫海岭（Mendeleev Ridge）获取了总长320厘米的重力岩心（gravity core）E25（编号Arc7-E25，站位坐标：179.4°E，79.0°N，采样水深1200米）。2019年于Geotop-UQAM实验室完成分析的铀钍系测年数据（U-Th series measurements），结合碳十四（14C）年代数据，被用于建立该岩心的年代地层框架。此外，本研究还对该岩心开展了总有机碳（Total Organic Carbon, TOC）及其碳同位素δ¹³C、粒度分布、全岩矿物组成等测试分析，以评估东西伯利亚冰架/冰盖（East Siberian Ice Shelf/Sheet）的韧性，并为北冰洋西部海域呈现独特的古海洋学视角。