Reference : Lacustrine clay mineral assemblages as a proxy for land-use and climate changes over ...
Scientific congresses and symposiums : Poster
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/210716
Lacustrine clay mineral assemblages as a proxy for land-use and climate changes over the last 4 kyr: The Amik Lake
English
El Ouahabi, Meriam mailto [Université de Liège > Département de géologie > Argiles, géochimie et environnements sédimentaires >]
Hubert, Aurelia mailto [Université de Liège > Département de géographie > Géomorphologie et Géologie du Quaternaire >]
Allan, Mohammed mailto [Université de Liège > Département de géologie > Argiles, géochimie et environnements sédimentaires >]
KARABACAK, Volkan [Eskisehir Osmangazi University > > > >]
SCHMIDT, Sabine [University of Bordeaux 1 > > > >]
Fagel, Nathalie mailto [Université de Liège > Département de géologie > Argiles, géochimie et environnements sédimentaires >]
10-May-2017
Yes
No
International
PAGES-Past Global Changes
du 8 au 13 mai 2017
zaragoza
Spain
[en] Climate; Weathering conditions ; Last millenia ; Lake sediments ; Antioch ; Clay mineralogy ; Land erosion ; Dried lake
[en] Lake sediments are sensitive to landscape changes and most of these changes seem to be modulated by land-use (anthropogenic factors) coupled to palaeoenvironmental/palaeoclimatic changes. In its detrital fraction, the lacustrine sediments record the history of soil erosion within its catchment via the inputs of clays and others detrital products. Within a Mediterranean context, the study investigates the upper sediments infilling the central part of the Amik basin in southern Turkey. This tectonic basin was occupied and exploited by modern human at least since 6000-7000 BC. We focus on the clay mineralogy (x-ray diffraction on oriented aggregates) and magnetic susceptibility measurements (Bartington) of the sedimentary record in the area over the last 4000 years, to assess environmental changes in relation with the different land uses and/or weathering during the successive Bronze, Iron, Roman, Islamic/Ottoman and Modern civilizations. The clay fraction of Amik Lake sediments comprises smectite, kaolinite, illite, chlorite and chlorite/smectite mixed layers that are the inherited clay phases. A relative change in abundance and crystallinity and chemistry of illite attests that environmental conditions evolved in the Amik Plain from the Bronze to Modern Age in relation with climates and/or land-use changes. The history of the Amik Lake reveals different soil erosion episode. The most intense erosion phase occurred during the Bronze/Iron Ages as indicated by the clay and magnetic susceptibility proxies. The Roman period was an exceptional period with soil erosion products arriving from the watershed, probably due the water channelization. A reduction of soil erosion occurred during the post Roman period until nowadays. Significant pedogenesis transformations are evidenced, especially during the Islamic/Ottoman periods suggesting intense chemical weathering conditions related to climate change.
Researchers ; Professionals ; Students ; Others
http://hdl.handle.net/2268/210716

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