| dc.creator | Rojas,Nora | |
| dc.creator | Silva,Nelson | |
| dc.date | 2005-11-01 | |
| dc.date.accessioned | 2017-03-07T15:55:36Z | |
| dc.date.available | 2017-03-07T15:55:36Z | |
| dc.identifier | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-71782005000200005 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/393152 | |
| dc.description | Eleven surface sediment cores were taken with a Rumohr corer during the oceanographic cruise Cimar 8 Fiordos (July 2002; between the Corcovado Gulf and Pulluche Channel). These cores were used to determine the vertical distribution of organic carbon, total nitrogen, and their atomic ratio (C/N) for use as a diagenesis indicator. The grains 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, although in 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 in origin. Values were lower at more oceanic stations and greater at more coastal stations; the contribution of terrigenous materials was greater at the latter. We inferred a slower break down of organic carbon as compared to total nitrogen from a steady-state first-order degradation kinetics model, that was applied to stations where both fractions had exponential vertical distributions. Remineralization percentages were between 23 and 34% (organic carbon) and 33 and 43% (total nitrogen) and accumulation percentages were between 77 and 66% (organic carbon) and 67 and 57% (total nitrogen) | |
| dc.format | text/html | |
| dc.language | en | |
| dc.publisher | Escuela de Ciencias del Mar <BR>Pontificia Universidad Católica de Valparaíso | |
| dc.source | Investigaciones marinas v.33 n.2 2005 | |
| dc.subject | sediments | |
| dc.subject | grain size | |
| dc.subject | carbon | |
| dc.subject | nitrogen | |
| dc.subject | C:N, diagenesis | |
| dc.subject | estuaries | |
| dc.subject | fjords | |
| dc.subject | Chile | |
| dc.title | Early diagenesis and vertical distribution of organic carbon and total nitrogen in recent sediments from southern Chilean fjords (Boca del Guafo to Pulluche Channel) | |
| dc.type | Artículos de revistas | |
