Aniceto K. auteur aut IRD Moreira Turcq Patricia auteur aut IRD Cordeiro R.C. auteur aut IRD Quintana I. auteur aut IRD Fraizy Pascal auteur aut IRD Turcq Bruno auteur aut IRD text journalArticle eng text/pdf reformatted digital access The Amazon is responsible for the higher discharge of water and sediment from continent to ocean in the world, but the Amazon basin embodies a large variety of regions with different seasonal climate, hydrological regimes and vegetation. Some of these compartments may be considered as the most critical zones because they encompass severe changes in the recent past and one of the geomorphological features mostly impacted by these changes are the Amazon floodplains. In this study we report data from a floodplain lake, Quistococha, in Peru. The sediment was dated, radiographed, described and bulk density, granulometry, mineral composition, and total organic carbon were determined. Two distinctive sedimentary depositional phases were identified. During the first one, between 6100 and 5600 cal years BP, Quistococha Lake was strongly influenced by the Amazon River constraining high sediment accumulation rates. The influence of Amazon River decreased and ceased around 5600 cal years BP, due to an avulsion of the River toward its present-day position. Between 5600 and 2600 cal years BP a gap in sedimentation is observed, probably related to the dry mid-Holocene climate conditions. The sedimentation re-started about 2600 cal years BP, now the lake is an isolated lake. (Abstract author) specialized LAC PLAINE INONDABLE SEDIMENT DATATION DENSITE APPARENTE GRANULOMETRIE COMPOSITION MINERALOGIQUE CARBONE ORGANIQUE COURS D'EAU GEOCHIMIE GEOMORPHOLOGIE BASSIN VERSANT VARIATION SAISONNIERE REGIME HYDROLOGIQUE VEGETATION HOLOCENE PALEOHYDROLOGIE PEROU AMAZONIE 064SEDIM 032MILPHY Gaillardet J. ed. edt IRD 10 287-291 2014 1878-5220 Geochemistry of the Earth's Surface Meeting, 10., Paris (FRA), 2014/08/18-23 https://www.documentation.ird.fr/hor/fdi:010065213 10.1016/j.proeps.2014.08.065 1878-5220 [F B010065213] https://www.documentation.ird.fr/hor/fdi:010065213 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers15-09/010065213.pdf IRD - Base Horizon / Pleins textes 2015-09-11 2015-10-07 fdi:010065213 fre