Relating the composition of continental margin surface sediments from the Ross Sea to the Amundsen Sea, West Antarctica, to modern environmental conditions

【Author】

WANG Jiakai;LI Tiegang;TANG Zheng;XIONG Zhifang;LIU Yanguang;CHEN Zhihua;CHANG Fengming;Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural and Resources;Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology;

【Institution】

Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural and Resources;Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology;

【Abstract】

Investigating the multiple proxies involving productivity,organic geochemistry,and trace element (TE) enrichment in surface sediments could be used as paleoenvironment archives to gain insights into past and future environmental conditions changes.We present redox-sensitive TEs (Mn,Ni,Cu,U,P,Mo,Co,V,Zn,and Cd),productivity-related proxies (total organic carbon and opal),and total nitrogen and CaCO_(3 )contents of bulk surface sediments of this area.The productivity proxies from the shelf and coastal regions of the Ross and the Amundsen seas showed that higher productivity was affiliated with an area of nutrient-rich deep water upwelling.The upwelling of weakly corrosive deep water may be beneficial for preserving CaCO_(3,)while highly corrosive dense water,if it forms on the shelf near the coastal region (coastal polynya),could limit the preservation of CaCO_3in modern conditions.There were no oxic or anoxic conditions in the study area,as indicated by the enrichment factors of redox-sensitive TEs (Mn,Co,and U).The enrichment factor of Cd,which is redox-sensitive,indicated suboxic redox conditions in sediment environments because of high primary productivity and organic matter preservation/decomposition.The enrichment factors of other redox-sensitive TEs (P,Ni,Cu,V,and Zn) and the correlations between the element/Ti ratio with productivity and nutrient proxies indicated that the organic matter decomposed,and there was massive burial of phytoplankton biomass.There was variation in the enrichment,such that sediments were enriched in P,Mo,and Zn,but depleted in Ni,Cu,and V.

【Keywords】

redox;;nutrient;;productivity;;shelf and coastal region;;offshore of Ruppert and Hobbs coasts;;Ross Sea;;Amundsen Sea

References

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Springer Journals Database

Total: 66 articles

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