Table of Contents
Minerals, Volume 10, Issue 6 (June 2020) – 94 articles
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Cover Story (view full-size image) We present the first estimate for a contourite drift budget in the Gulf of Cadiz. This is based on [...] Read more. We present the first estimate for a contourite drift budget in the Gulf of Cadiz. This is based on a range of published data on sediment composition and texture, together with our observations on unusual components (SEM images). The budget includes approximately 30-35% pelagic biogenics and 65-70% land-derived material. Of the latter, only about 5% arrives at the drift sites via local hemipelagic diffusion from wind-blown and river-plume supply, whereas 60-65% is transported in bottom currents. Downslope supply of tunicate spicules, micro-bored shells and Braarudosphaera biglowii to the bottom current occurs upstream. Micro-mudclasts are derived from seafloor erosion. Bottom currents, operating across a basin-scale, act to fragment bioclasts and homogenise the overall drift composition. View this paper