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Fluid-escape features as a precursor of a large sublacustrine sediment slide in Lake Le Bourget, NW Alps, France
Chapron, E.; Van Rensbergen, P.; De Batist, M.; Beck, C.; Henriet, J.-P. (2004). Fluid-escape features as a precursor of a large sublacustrine sediment slide in Lake Le Bourget, NW Alps, France. Terra nova (Print) 16(5): 305-311. dx.doi.org/10.1111/j.1365-3121.2004.00566.x
In: Terra Nova. Blackwell: Oxford. ISSN 0954-4879; e-ISSN 1365-3121
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| Auteurs | | Top |
- Chapron, E.
- Van Rensbergen, P.
- De Batist, M.
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| Abstract |
The north-western corner of Lake Le Bourget is situated along an active fault zone and accommodated a large sediment supply from the Rhone River until the end of the Late Glacial period. On the delta slope, the Holocene sheet drape that covers the largest buried mass wasting deposit (the HDU) shows undulations, small fractures and discontinuities that are attributed to downslope creep. Evidence for episodes of vigorous fluid expulsion is found in association with these discontinuities. All these features are rooted at the top of the HDU and occur along two specific isobaths. These observations indicate a close link between fractures and focused fluid flow. We suggest that focused fluid flow triggered by earthquakes facilitates the formation of small-scale faults that accommodate part of the downslope movement and eventually link up to form a head-scarp of a large slide (c. 107 m3). |
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