Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning

Polar research

Martin Jakobsson¹  Daniela Hanslik²  Ludvig Löwemark⁴ 

[1] Climate Science Division Alfred Wegener Institute for Polar and Marine Research Bussestraße 24DE-27570 Bremerhaven Germany;Department of Geological Sciences Stockholm UniversitySE-106 91 Stockholm Sweden;Department of Geological Sciences Stockholm UniversitySE-106 91 Stockholm Sweden Correspondence;Department of Geosciences National Taiwan University No. 1 Sec. 4 Roosevelt Road106 Taipei Taiwan

关键词: Foraminifera;    Arctic Ocean;    IRD;    calcareous microfossils;    XRF scanning;   

DOI  :  10.3402/polar.v32i0.18386

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

X-ray fluorescence (XRF) scanning of sediment cores from the Lomonosov Ridge and the Morris Jesup Rise reveals a distinct pattern of Ca intensity peaks through Marine Isotope Stages (MIS) 1 to 7. Downcore of MIS 7, the Ca signal is more irregular and near the detection limit. Virtually all major peaks in Ca coincide with a high abundance of calcareous microfossils; this is particularly conspicuous in the cores from the central Arctic Ocean. However, the recorded Ca signal is generally caused by a combination of biogenic and detrital carbonate, and in areas influenced by input from the Canadian Arctic, detrital carbonates may effectively mask the foraminiferal carbonates. Despite this, there is a strong correlation between XRF-detected Ca content and foraminiferal abundance. We propose that in the Arctic Ocean north of Greenland a common palaeoceanographic mechanism is controlling Ca-rich ice-rafted debris (IRD) and foraminiferal abundance. Previous studies have shown that glacial periods are characterized...

【 授权许可】

CC BY-NC