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Mei Jing, Wang Rujian, Zhang Taoliang, Xiao Wenshen, Chen Zhihua, Chen Jianfang, Cheng Zhenbo, Sun Yechen. Paleoceanographic records of core 08P31 on the Chukchi Plateau, Western Arctic Ocean[J]. Haiyang Xuebao, 2015, 37(5): 121-135. doi: 10.3969/j.issn.0253-4193.2015.05.012
Citation: Mei Jing, Wang Rujian, Zhang Taoliang, Xiao Wenshen, Chen Zhihua, Chen Jianfang, Cheng Zhenbo, Sun Yechen. Paleoceanographic records of core 08P31 on the Chukchi Plateau, Western Arctic Ocean[J]. Haiyang Xuebao, 2015, 37(5): 121-135. doi: 10.3969/j.issn.0253-4193.2015.05.012

Paleoceanographic records of core 08P31 on the Chukchi Plateau, Western Arctic Ocean

doi: 10.3969/j.issn.0253-4193.2015.05.012
  • Received Date: 2014-04-10
  • Rev Recd Date: 2014-10-13
  • Multi-proxy investigations were performed on core 08P31 collected from the Chukchi Plateau,Western Arctic Ocean,during the Third Chinese National Arctic Expedition. The core was dated back to Marine Isotope Stage (MIS) 3 by a combination of AMS 14C dating and regional core correlation. Results obtained for total organic carbon contents (TOC) and Biogenic opal content (Opal) in the core show that since MIS 3,the total productivity showed a trend of rising,but the siliceous biological productivity was generally low. CaCO3 contents in the core suggested input of not only marine organic carbon,but also of detrital carbonate. By comparing C/N ratio with TOCmar/TOC,TOCmar and TOCter which are calculated from the value of δ13Corg by "both two end-element method",we suggested that it was very reliable to use the value of δ13Corg, as the specification of organic sources. The δ results showed that the source of organic matter of core 08P31 was indicated to be marine organic matter. And,terrigenous organic matter could also contribute to the increased TOC% in the brown layer B2 and white layer W3. The co-variations light δ18O and-13C values of Neogloboquadrina pachyderma (Sin.) (Nps) in core 08P31 indicated that the light values in the brown layer B2 and gray layer G1 in MIS 3 and MIS 1 were resulted from meltwater events; and those in the top of yellow brown layer Yb1 to white layer W3 were caused by the enhanced sea ice formation and light brine injection. The occurrence of heavy δ18O and-13C values in the middle of yellow brown layer Yb1 and white layer W3 concurrent with low foraminiferal abundances could indicate cold water temperature and nutrition environment. The Nps18O values varied inversely with Nps13C values in yellow brown layer Yb2 could indicate that the study area was covered by thick sea ice or ice sheet with cold temperatures and little meltwater,which prevented the bio-productivity and sea-atmosphere exchange,as well as water mass ventilation.
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