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1 March 2005 Present-Day Rhythmic Deposition in the Grand Rhone Prodelta (NW Mediterranean) According to High-Resolution Pollen Analyses
Célia Beaudouin, Jean-Pierre Suc, Geneviève Cambon, Abdelali Touzani, Pierre Giresse, Didier Pont, Jean-Claude Aloïsi, Tania Marsset, Pierre Cochonat, Danièle Duzer, Jacqueline Ferrier
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Abstract

A high-resolution pollen study (136 samples) has been performed on the KTR05 core (738 cm long) located in the modern Grand Rhône prodelta. The objectives were (1) to evaluate the palynological and sedimentological record quality of a prodelta in comparison with fluvial inputs (2) and to quantify lost sediment (resuspensions) in this area. The core covers more than the last thirty years. By comparison with the modern pollen rain both in the Rhône delta and in the mid-drainage basin (Lyon), a seasonal forcing in pollen deposition has been demonstrated. Monthly pollen successions can be evidenced in a well preserved sequence, providing an estimate of the true sedimentation rate (60 cm.yr−1). Importance of disturbed or incomplete sequences suggests that most of the sediment first deposited in the prodelta (around ⅔) has been resuspended. Sedimentological and palynological data record not only seasonal but fluvial impact. The progressive shift of the prodelta has been evidenced firstly with sedimentology and secondly with palynology. Despite high fluvial impact, pollen grains in the KTR05 core are representatives of the vegetation of the Rhône drainage basin. The apparent homogeneity of the pollen spectra evidences the high reliability of palynology applied on prodeltaic area, at least in a microtidal environment.

Célia Beaudouin, Jean-Pierre Suc, Geneviève Cambon, Abdelali Touzani, Pierre Giresse, Didier Pont, Jean-Claude Aloïsi, Tania Marsset, Pierre Cochonat, Danièle Duzer, and Jacqueline Ferrier "Present-Day Rhythmic Deposition in the Grand Rhone Prodelta (NW Mediterranean) According to High-Resolution Pollen Analyses," Journal of Coastal Research 2005(212), 292-306, (1 March 2005). https://doi.org/10.2112/02-878.1
Received: 21 September 2002; Accepted: 1 September 2002; Published: 1 March 2005
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