Title of article :
Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa
Author/Authors :
Plewa، نويسنده , , K. and Meggers، نويسنده , , H. and Kuhlmann، نويسنده , , H. and Freudenthal، نويسنده , , Ariana Tart-Zelvin & T. Andrew Zabel، نويسنده , , M. and Kasten، نويسنده , , S.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
16
From page :
51
To page :
66
Abstract :
One hundred and twenty-eight surface-sediment samples collected off North-West Africa were studied geochemically to detect the expressions of different meridional climate regimes and zonal productivity gradients in the surface sediments. This geochemical multi-tracer approach, coupled with additional information on the bulk carbonate and TOC contents makes it possible to characterise the sedimentological regime in detail. Typical terrigenous elements like Al, K and Fe mirror the importance of the humid (fluvial) influence in the north of the study area and the dominance of aeolian input in the south. Furthermore, the distributions of Ti and Fe in the surface sediments serve as tracers for the supply of eolian volcanic material from the Canary Islands. The spatial variability of the TOC contents in the surface sediments closely follows the ocean surface productivity patterns, whereas the CaCO3 contents are mainly controlled by dilution with terrigenous matter. The potential productivity proxy Ba is not a reliable tracer for productivity in this region, since it is mainly supplied by terrigenous input (coupled with aluminosilicates).
Keywords :
Marine surface sediments , NW Africa , Geochemical tracers , BA , Terrigenous input , Productivity , Canary Islands
Journal title :
Deep Sea Research Part I: Oceanographic Research Papers
Serial Year :
2012
Journal title :
Deep Sea Research Part I: Oceanographic Research Papers
Record number :
2309765
Link To Document :
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