Arctic Ocean manganese contents and sediment colour cycles

Polar research

Jan Backman¹  Magnus Mörth¹  Martin Jakobsson¹  Ludvig Löwemark² 

[1] Department of Geology and Geochemistry, Stockholm University, SE-106 91 Stockholm, Sweden;Department of Geology and Geochemistry, Stockholm University, SE-106 91 Stockholm, SwedenCorrespondence

关键词: manganese;    Mn;    colour cycles;    ventilation cycles;    Arctic Ocean.;   

DOI  :  10.1111/j.1751-8369.2008.00055.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Cyclical variations in colour and manganese content in sediments from the central Arctic Ocean have been interpreted to represent climatically controlled changes in the input of Mn from the Siberian hinterland, and/or variations in the intermediate and deep water ventilation of the Arctic basins, although a diagenetic origin has not been excluded. A reinvestigation of core 96/12-1pc using an Itrax X-ray fluoresence (XRF) core scanner confirms that these colour cycles are indeed controlled by variations in Mn content, although changes in the source region of the sediment may override the Mn colour signal in certain intervals. The prominent Mn cycles show no correspondence to any of the other measured elements. This decoupling of Mn and the bulk chemistry of the sediment is taken to indicate that the cycles observed are caused by variations in water column ventilation and riverine input, rather than variations in sediment source or diagenesis. We therefore conclude that the Mn maxima do represent warm phase...

【 授权许可】

CC BY-NC