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008 220821b |||||||| |||| 00| 0 eng d
100 _aRøthe, Torgeir O
_952107
245 _aWintertime extreme events recorded by lake sediments in Arctic Norway/
260 _bSage,
_c2019.
300 _aVol 29, issue 8, 2019 : (1305-1321 p.).
520 _aMarine mud belts represent potential continuous high-resolution climatic, environmental and anthropogenic archives. In this study, a geochemical record of the Gulf of Lions mud belt, which receives sediments from the Rhône watershed and to a lesser extent from the Languedoc region, is reported from Core KSGC-31. The effects of natural climatic changes and possible anthropogenic disturbances on Holocene sedimentation were ascertained by analysing sedimentation rates, chemical weathering (Al2O3/K2O) and sediment-source shifts (neodymium isotopic ratios; εNd). Measurements of elemental and isotopic lead were used to trace the source and determine the potential vectors of anthropogenic contaminations over the Holocene. High εNd values, recorded from 9000 to 3000 calibrated annum before present (cal. a BP) and around 1500 and 600 cal. a BP, are interpreted as an increase in sediment transport from the Alpine crystalline massifs to the sea induced by enhanced hydro-sedimentary conditions upstream. During the early and middle Holocene, low and stable weathering conditions were persistent, while the late Holocene was characterized by higher and more fluctuating weathering conditions. Sudden changes in the 206Pb/207Pb ratio observed during the Roman and Medieval periods suggest clear shifts in lead source from a natural Holocene background to late Holocene anthropogenic contaminations. Even though those shifts are coeval with atmospheric lead contaminations from Spain and Germany recorded in several sediment and ice archives, the local origin (the Cévennes) and the fluvial contamination is more likely in these cases. Those findings are contemporaneous with historical mining records in the Cévennes and point to an intensification of the merchant shipping.
650 _aHolocene,
_950806
650 _amarine mud belt,
_952108
650 _amedieval lead contamination,
_952109
650 _aRoman lead contamination,
_952110
650 _asediment source fingerprinting,
_952111
650 _asouth of France
_952112
700 _aBakke, Jostein
_952113
700 _aStøren, Eivind WN
_952114
700 _a Dahl, Svein O
_952115
700 _aJouet, Gwenael
_952116
700 _a Berné, Serge
_952117
700 _aNonnotte, Philippe
_952118
700 _a Liorzou, Céline
_952120
773 0 _012756
_916504
_dLondon: Sage Publication Ltd, 2019.
_tHolocene/
_x09596836
856 _uhttps://doi.org/10.1177/0959683619846983
942 _2ddc
_cART
999 _c12848
_d12848