Flood and earthquake disturbance of 210Pb geochronology (Lake Anterne, NW Alps)

被引:131
作者
Arnaud, F [1 ]
Lignier, V
Revel, M
Desmet, M
Beck, C
Pourchet, M
Charlet, F
Trentesaux, A
Tribovillard, N
机构
[1] Univ Lille 1, UMR Bilan & Proc Domaine Sedimentaire, CNRS, F-59655 Villeneuve Dascq, France
[2] Univ Savoie, F-73376 Le Bourget Du Lac, France
[3] Univ Grenoble 1, OSUG, F-38400 St Martin Dheres, France
[4] CNRS, UMR 5511, Lab Glaciol & Geophys Enviornm, F-38402 St Martin Dheres, France
关键词
D O I
10.1046/j.1365-3121.2002.00413.x
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Dating recent lake sediment records yielding disturbed (210) Pb profiles has been a problem of wide interest in palaeoclimatic and palaeoseismic studies over the last few centuries. When applied to an alpine lake sedimentary record, a high-resolution sedimentological study reveals that the Pb-210 profile is disturbed by the occurrence of single-event deposits triggered by two different mechanisms: flood events deposits and gravity reworking. Removing disturbed layers from the (210) Pb profile yields a logarithmic depth-activity relationship. Using a simple (210) Pb decay model (CFCS) provides an assessment of mean accumulation rate of `continuous sedimentation', as opposed to `event-linked sedimentation'. The correlation of the thickest four gravity-reworked deposits with historically known earthquakes permits both validation and refinement of the age-depth relationship. This refinement highlights variations in accumulation rate consistent with post-Little Ice Age climatic variations.
引用
收藏
页码:225 / 232
页数:8
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