Computer Science
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..339s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Issue 3, pp.339-341
Computer Science
20
Scientific paper
Microbial decomposition of organic matter in recent sediments of the Landsort Deep--an anoxic basin of the central Baltic Sea--resulted in the formation of a characteristic assemblage of authigenic mineral precipitates of carbonates, sulfides. phosphates and amorphous silica, The dominant crystalline phases are a mixed Mn-carbonate [(Mn 0.85 Ca 0.10 Mg 0.05 )CO 3 ]. Mn-sulfide [MnS] and Fecarbonate [FeCO 3 ]. Amorphous Fe-sulfide [FeS]. Mn-phosphate [Mn 3 (PO 4 ) 2 ] and a mixed Fe-Ca-phosphate [(Fe 0.86 Ca 0.14 ) 3 (PO 4 ) 2 ] were identified by their chemical compositions only. The variability in composition of these solid phases and their mode of occurrence as a co-existing assemblage constrains the conditions and solution composition from which they precipitated. Estimates of activities for dissolved Fe. Mn. PO 4 , CO 3 and S in equilibrium with such an assemblage are close to those found in recent anoxic interstitial water-sediment systems. It is important to have detailed knowledge of the composition and stability conditions of these solid precipitates in order to refine stoichiometric models of interstitial nutrient regeneration in anoxic sediments.
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