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Dynamics of sigmaCO2 in a surficial sandy marine sediment: the role of chemoautotrophyThomsen U, Kristensen E
ABSTRACT: Net consumption and production of CO2 in the surface layers of a sandy marine sediment were examined with a depth resolution of 1 mm. A transient state diagenetic model fitted to measured porewater profiles of total inorganic carbon
(SigmaCO2) in open incubated sediment plugs revealed 3 distinct zones. The first was an upper oxic/suboxic zone of 5 to 8 mm depth with high net SigmaCO2 production rates (4910 to 5570 nmol cm-3 d-1). The second
zone (8 to 9 mm) below the suboxic layer showed a net CO2 uptake (161 to 191 nmol cm-3 d-1) which coincided with the zone of maximum 14C-labeled bicarbonate fixation (R[
KEY WORDS: Mineralization · Carbon fixation · Diagenetic modelling · Sulfate reduction · Thiosulfate · Marine sediment
Published in AME Vol.
12, No. 2
(1997) on April 10
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