CLIMATIC CHANGES AND ANTHROPOGENIC EFFECT S DURING THE LAST MILLENNIUM ATTESTED BY THE PETROGRAPHIC STUDY OF ORGANIC-MATTER (ANNECY, LE-PETIT-LAC FRANCE)

Authors
BUILLIT N LALLIERVERGES E DISNAR JR LOIZEAU JL
Citation
N. Buillit et al., CLIMATIC CHANGES AND ANTHROPOGENIC EFFECT S DURING THE LAST MILLENNIUM ATTESTED BY THE PETROGRAPHIC STUDY OF ORGANIC-MATTER (ANNECY, LE-PETIT-LAC FRANCE), Bulletin de la Societe geologique de France, 168(5), 1997, pp. 573-583
Citations number
27
Journal title
Bulletin de la Societe geologique de France → ACNP
ISSN journal
00379409
Volume
168
Issue
5
Year of publication
1997
Pages
573 - 583
Database
ISI
SICI code
0037-9409(1997)168:5<573:CCAAES>2.0.ZU;2-6
Abstract
The petrographical study of the sedimentary organic matter contained i n recent sediments from ''Le Petit Lac d'Annecy'' allows to obtain a p alaeoenvironmental signal based on the aurochthonous/allochthonous org anic matter ratio of the past 1000 years. The new limnological regime, linked with the anthropisation of the watershed, makes possible to re ad directly this signal in terms of lacustrine phytoplanktonic product ion since ca AD 1000. This signal also points out various erosion even ts seen by specific organic deliveries from the watershed, evidencing periods of increased running-off or intensive land-uses.