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| Format: | Artículo científico |
| Language: | en |
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Pontificia Universidad Católica de Valparaíso
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=45633205 |
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Table of Contents:
- Early diagenesis and vertical distribution of organic carbon and total nitrogen in recent sediments from southern Chilean fjords (Boca del Guafo to Pulluche Channel) Nora Rojas Nelson Silva Ciencias de la Tierra C:N Chile carbon fjords nitrogen Eleven surface sediment cores were taken with a Rumohr corer during the oceanographic cruise Cimar8 Fiordos (July 2002; between the Corcovado Gulf and Pulluche Channel). These cores were used to determine thevertical distribution of organic carbon, total nitrogen, and their atomic ratio (C/N) for use as a diagenesis indicator. Thegrains observed were mostly clay-silt in four of the sediment cores and more heterogeneous in the other seven cores.Organic carbon and total nitrogen concentrations were higher in the four clay-silt cores than in the sandy cores, althoughin terms of their vertical distribution, both concentrations were relatively homogenous at most stations. Nevertheless,exponential decreases characteristic of first-order diagenetic degradation were observed in cores from three stations.The C:N ratio fluctuated between 7 and 10, indicating that the organic material in the sediments was mostly marine inorigin. Values were lower at more oceanic stations and greater at more coastal stations; the contribution of terrigenousmaterials was greater at the latter. We inferred a slower break down of organic carbon as compared to total nitrogenfrom a steady-state first-order degradation kinetics model, that was applied to stations where both fractions hadexponential vertical distributions. Remineralization percentages were between 23 and 34% (organic carbon) and 33and 43% (total nitrogen) and accumulation percentages were between 77 and 66% (organic carbon) and 67 and 57%(total nitrogen). 2005 artículo científico 0716-1069 https://www.redalyc.org/articulo.oa?id=45633205 en http://www.redalyc.org/revista.oa?id=456 Investigaciones Marinas application/pdf Pontificia Universidad Católica de Valparaíso Investigaciones Marinas (Chile) Num.2 Vol.33