Recent sedimentation and sedimentary budgets on the western Iberian shelf |
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Authors: | J. M. Jouanneau O. Weber T. Drago A. Rodrigues A. Oliveira J. M. A. Dias C. Garcia S. Schmidt J. L. Reyss |
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Affiliation: | 1. Landcare Research, Gisborne 4040, New Zealand;2. Landcare Research, Palmerston North 4442, New Zealand;3. Institute of Natural Resources, College of Sciences, Massey University, Palmerston North, New Zealand;4. Geological and Nuclear Sciences, Wellington, New Zealand;5. University of Canterbury, Christchurch, New Zealand;1. Second Institute of Oceanography, State Oceanic Administration, 310012 Hangzhou, China;2. Zhoushan Worksation, East China Sea Branch of State Oceanic Administration, 316100 Zhoushan, China |
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Abstract: | Thus study is based on 31 box-core samples collected mainly from the mud-patches of the Galician and North-Portuguese shelf. Each of these cores, some decimetres in length, have been described, radiographied and sampled each centimetre for grain-size analysis and measurement of the particulate organic carbon (Corg) content. 210Pb excess profiles have been measured using gamma spectrometry, which, combined with the analysis of the vertical variations of the sedimentary facies, have allowed estimates of sedimentation rates. These rates were found to vary between 0.05 and 0.40 cm yr−1. Considering the latitudinal variation of sedimentation rates around the 100m contour, we note that the maximum rates occurred off the Douro estuary in the southern sector and also near the Galician rias to the north. The organic content (Corg) of sediments varied between 0.4 and 2%. Latitudinally Corg showed a decrease from the South to the North. These results coupled with the sedimentary map (see Dias, Gonzalez, Garcia & Diaz del Rio, 2001) have permitted us to establish the detrital mass budget and an inventory of Corg burial. |
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