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Title: Subseafloor stratigraphic profiling and soil classification from piezocone tests: A case study in the Gulf of Lion (NW Mediterranean Sea)
Author: Lafuerza, Sara
Frigola Ferrer, Jaime I.
Canals Artigas, Miquel
Jouet, G.
Bassetti, M.A.
Sultan, N.
Berné, S.
Keywords: Estratigrafia
Classificació de sòls
Mediterrània (Mar)
Stratigraphic geology
Soil classification
Mediterranean Sea
Issue Date: 2008
Publisher: Wiley
Abstract: 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 usually do. Consequently, classical soil classification methods resulted in erroneous interpretation of these sediments as clays, whereas classification of the heterogeneous deposits at PRGL2 was consistent with the grain size. When tied to a high-resolution seismic reflection profile, the stratigraphy interpreted from the piezocone profile matches with the main seismic sequences and discontinuities defined from seismic stratigraphy analysis. Graded bedding also matches with cone tip resistance and sleeve friction data.
Note: Reproducció del document publicat a:
It is part of: Geochemistry, Geophysics, Geosystems, 2008, vol. 9, num. 12, p. 1-13
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ISSN: 1525-2027
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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