Biogeosciences
www.biogeosciences.net
1726-4170
1726-4189
4
2
2007
10.5194/bg-4-195-2007
http://www.biogeosciences.net/4/195/2007/
http://www.biogeosciences.net/4/195/2007/bg-4-195-2007.html
http://www.biogeosciences.net/4/195/2007/bg-4-195-2007.pdf
195
203
2007-03-15
Manganese content records seasonal upwelling in Lake Tanganyika mussels
D. Langlet
dlanglet@africamuseum.be
L. Y. Alleman
P.-D. Plisnier
H. Hughes
L. André
Section de Pétrographie-Minéralogie-Géochimie, Musée Royal de l'Afrique Centrale, Leuvensesteenweg 13, 3080 Tervuren, Belgium
Biogenic productivity of Lake Tanganyika is highly dependent on seasonal
upwellings of cold, oxygen-depleted, nutrient-rich deep waters. We investigated the shell of freshwater
bivalve <i>Pleiodon spekii</i> as a geochemical archive of these periodic hydrological changes
tuned by the monsoon regime. The results of a three-year-long limnological
and geochemical survey of the coastal waters performed on the dissolved and
particulate fractions were compared to LA-ICP-MS profiles of Mn in five
aragonitic shells from the same lake location. Three shells present very
similar Mn/Ca profiles dominated by a peak that matched the concomitant
increase of Mn and chlorophyll <i>a</i> in surface waters during the 2002 upwelling,
while a shell collected during 2003 dry season detect both 2002 and 2003
upwelling events. Larger shells showing an extremely reduced growth display
more than 8 Mn/Ca peaks suggesting at least an 8-year-record of seasonal
changes in water composition. We postulate that Mn/Ca in shells record the
conjunction of an increase of biological activity with supplied of dissolved
Mn and nutriments in coastal waters, resulting in an enhanced assimilation
of biogenic Mn-rich particles. By combining the most recent generation of
laser ablation system and the powerful High Resolution ICP-MS, the spatial
resolution could be improved down to 5 to 10 µm crater size and end up
in a better constrain of the relative variations of the annual Mn peaks.
Such an approach on <i>P. spekii</i> from Lake Tanganyika has definitively a great
potential to provide recent and past records on primary productivity
associated with the monsoon climate system.
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