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Registros recuperados: 5
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A 500 kyr record of global sea-level oscillations in the Gulf of Lion, Mediterranean Sea: new insights into MIS 3 sea-level variability 5
Frigola, J.; Canals, M.; Cacho, I.; Moreno, A.; Sierro, F. J.; Flores, J. A.; Berne, Serge; Jouet, Gwenael; Dennielou, Bernard; Herrera, G.; Pasqual, C.; Grimalt, J. O.; Galavazi, M.; Schneider, R..
Borehole PRGL1-4 drilled in the upper slope of the Gulf of Lion provides an exceptional record to investigate the impact of late Pleistocene orbitally-driven glacio-eustatic sea-level oscillations on the sedimentary outbuilding of a river fed continental margin. High-resolution grain-size and geochemical records supported by oxygen isotope chronostratigraphy allow reinterpreting the last 500 ka upper slope seismostratigraphy of the Gulf of Lion. Five main sequences, stacked during the sea-level lowering phases of the last five glacial-interglacial 100-kyr cycles, form the upper stratigraphic outbuilding of the continental margin. The high sensitivity of the grain-size record down the borehole to sea-level oscillations can be explained by the great width of...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00088/19944/17599.pdf
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A dynamic explanation for the origin of the western Mediterranean organic-rich layers 5
Rogerson, M.; Cacho, I.; Jimenez-espejo, F.; Reguera, M. I.; Sierro, F. J.; Martinez-ruiz, F.; Frigola, J.; Canals, M..
The eastern Mediterranean sapropels are among the most intensively investigated phenomena in the paleoceanographic record, but relatively little has been written regarding the origin of the equivalent of the sapropels in the western Mediterranean, the organic-rich layers (ORLs). ORLs are recognized as sediment layers containing enhanced total organic carbon that extend throughout the deep basins of the western Mediterranean and are associated with enhanced total barium concentration and a reduced diversity (dysoxic but not anoxic) benthic foraminiferal assemblage. Consequently, it has been suggested that ORLs represent periods of enhanced productivity coupled with reduced deep ventilation, presumably related to increased continental runoff, in close...
Tipo: Text Palavras-chave: Sapropel; Mediterranean; Sea level; Paleoceanography; Circulation.
Ano: 2008 URL: https://archimer.ifremer.fr/doc/00237/34825/33303.pdf
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Holocene climate variability in the western Mediterranean region from a deepwater sediment record 5
Frigola, J.; Moreno, A.; Cacho, I.; Canals, M.; Sierro, F. J.; Flores, J. A.; Grimalt, J. O.; Hodell, D. A.; Curtis, J. H..
The detailed analysis of the International Marine Past Global Changes Study core MD99-2343 recovered from a sediment drift at 2391 m water depth north of the island of Minorca illustrates the effects of climate variability on thermohaline circulation in the western Mediterranean during the last 12 kyr. Geochemical ratios associated with terrigenous input resulted in the identification of four phases representing different climatic and deepwater overturning conditions in the Western Mediterranean Basin during the Holocene. Superimposed on the general trend, eight centennial- to millennial-scale abrupt events appear consistently in both grain size and geochemical records, which supports the occurrence of episodes of deepwater overturning reinforcement in the...
Tipo: Text Palavras-chave: Holocene climate variability; Thermohaline circulation; Western Mediterranean Sea.
Ano: 2007 URL: https://archimer.ifremer.fr/doc/00233/34448/32900.pdf
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Overpressure within upper continental slope sediments from CPTU data, Gulf of Lion, NW Mediterranean Sea 5
Lafuerza, S.; Sultan, Nabil; Canals, M.; Frigola, J.; Berne, Serge; Jouet, Gwenael; Galavazi, M.; Sierro, F. J..
Data from in situ piezocone tests (CPTU) and laboratory analyses are utilized for the interpretation of the stress history of Quaternary sedimentary sequences in the upper continental slope of the Gulf of Lion, northwestern Mediterranean Sea. A CPTU based preconsolidation pressure profile referenced to the current effective stress indicates that the deposit is underconsolidated from 12 meters below the seafloor (mbsf) down to at least 150 mbsf. Excess pore pressure below 12 mbsf is further supported by results from oedometer and dissipation tests. Subseafloor pockmarks and indications of free gas in seismic reflection profiles reveal four main overpressure sources (SI-SIV) with overpressure ratios > 0.3 at subseafloor depths coinciding with levels where...
Tipo: Text Palavras-chave: Gulf of Lion; Continental slope; Overpressure; Preconsolidation pressure; Stress history.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6649.pdf
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Subseafloor stratigraphic profiling and soil classification from piezocone tests: A case study in the Gulf of Lion (NW Mediterranean Sea) 5
Lafuerza, S.; Frigola, J.; Canals, M.; Jouet, Gwenael; Bassetti, Maria-angela; Sultan, Nabil; Berne, Serge.
We show the results provided by piezocone tests in determining the stratigraphic profile and the soil classification of two drilling sites in the outer shelf and the upper slope of the Gulf of Lion, PRGL2 and PRGL1, respectively. Correlations with grain-size data indicate that sleeve friction can be used for profiling fine-grained sediments (site PRGL1), whereas cone tip resistance is the most adequate for sequences made of alternations of coarse- and fine-grained intervals (site PRGL2). Normalized cone resistance and friction ratio proved to be also appropriate for soil stratigraphy as it depicts trends in the coarse fraction of the tested soil. Silts and clays present in similar proportions at site PRGL1 responded to piezocone testing as pure clays...
Tipo: Text Palavras-chave: Gulf of Lion; Soil classification; Stratigraphy; Piezocone.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6121.pdf
Registros recuperados: 5
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