Rock magnetic detection of distal ice-rafted debries: clue for the identification of Heinrich layers on the Portuguese margin (vol 180, pg 61, 2000)

High resolution measurements of concentration and grain size dependent magnetic parameters along a sedimentary sequence deposited on the Portuguese margin (38 degrees N) during the last 120 ka allowed the detection of multiple thin layers slightly enriched by a coarse lithogenic fraction. Sizes, mineralogy, shapes and mode of deposition identify the material as ice-rafted detritus (IRD). The four most recent events dated by calibrated radiocarbon ages are contemporaneous with Heinrich events HE1-HE4. Older events can be identified as HE5, HE6 or with minor IRD that occurred during stage 5, The resolution and sensitivity obtained with rock magnetic methods enable the detection of multiple secondary events showing that iceberg delivery was a frequent phenomenon directly linked to temperature variations over ice caps; Heinrich events representing the extreme cases. (C) 2000 Elsevier Science B.V. All rights reserved

Suspended sediment flux at the Rhone river mouth (France) based on ADCP measurements during flood events.

(IF 1.96 [2018]; Q2)International audienceSuspended sediment distribution and fluxes were estimated within the dominant channel at the mouth of the Rhone River for two annual flood events. The estimates were based on ADCP acoustic backscatter intensity and using calibration and post-processing methods to account for the grain-size distribution (GSDs). The fluxes were very similar to those obtained from suspended sediment measurements based on surface sampling at an automated station located 35 km upstream. Suspended Sediment Concentrations (SSC) and GSDs showed little variation along the channel cross section, except for a graduate suspension that appeared at the maximum of discharge, corresponding to velocities lower than 1 m.s-1 near the bottom. However, without post processing to account for the GSD, an under-estimation of 10% was observed during the two floods periods. The two flood events, separated by only two weeks, had clear differences in suspended fluxes and SSC, with twice more flux during the first event

The impact of rapid early- to mid-Holocene palaeoenvironmental changes on Neolithic settlement at Nea Nikomideia, Thessaloniki Plain, Greece

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