ratios in Pacific deep-sea sediments: Effect of inorganic ammonium and organic nitrogen compounds sorbed by clays |
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| Authors: | PJ Müller |
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| Institution: | Geologisch-Paläontologisches Institut der Universität Kiel, Olshausenstrasse 40/60, D-2300 Kiel, Federal Republic of Germany |
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| Abstract: | Analyses of organic carbon, total nitrogen, and inorganically bound ammonium (exchangeable and fixed ammonium) in two oxic deep-sea sediment cores from the Central Pacific Ocean revealed insufficiently high inorganic ammonium contents of these sediments to explain the low C/N ratios, although representing 20–45% of the total nitrogen.Both, organic carbon/total nitrogen ratios (ranging from 3.9?1.3) and organic carbon/organic nitrogen ratios (5.6?1.9) decrease with increasing sediment depth, the latter indicating a real enrichment of organic nitrogen compounds during diagenesis relative to total organic matter.Organic matter/alumina relationships indicate that this unusual preservation of organic nitrogen compounds is probably caused by sorption to clay minerals protecting them against bacterial attack. |
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