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Details van artikel 5 van 9 gevonden artikelen
| Titel: |
Gas and Organic Matter in Last Glacial and Holocenic Sediments of Venice Lagoon |
| Auteur: |
Curzi, P. V. Fabiano, M. Fava, G. |
| Verschenen in: |
Chemistry & ecology |
| Paginering: | Jaargang 14 (1997) nr. 1 pagina's 1-20 |
| Jaar: |
1997-12-01 |
| Inhoud: |
Two drills (MBM1* and MBM2) provided at “Bocca di Malamocco” gave environmental and palaeo-environmental information on sedimentation for the last 50,000 years. the MBM2 supplies textural, gas and organic matter studies of sediment and principal ion content of pore water. Two main palaeo-environments, divided in six cycles, are recognized. Marine environment characterizes the sediment above 12.80 metres below sea level (mbsl) and continental environment dominates the sediments below. The concentration/depth profiles of dissolved ammonia, phosphates and gases are related to the occurrence of a relatively high organic content in the sediment core. Carbon dioxide to methane ratio shows a constant value below 20 mbsl, while above that level only carbon dioxide was detected. A sulphate gradient in the transition zone between the marine to fresh water interval suggests a methane oxidation. These findings indicate that diffusive transport of methane from marine sediments to the atmosphere may be considered minimal. the sedimentary cycles are related to the oxygen isotopic stages. They suggest a variable hydraulic regime occurred during the last Glacial time in the palaeo-plain corresponding to the present Venice lagoon. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 9 gevonden artikelen
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