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- aggregation classification "P1".
- aggregation creator person.
- aggregation creator person.
- aggregation date "1998".
- aggregation hasFormat 400573.bibtex.
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- aggregation isPartOf urn:isbn:9789264160217.
- aggregation language "eng".
- aggregation publisher "Organization for Economic Cooperation and Development (OECD)".
- aggregation subject "Earth and Environmental Sciences".
- aggregation title "Fracturation and intraformational faulting of the Ieper Clay: evidence for a major palaeo-flow event".
- aggregation abstract "The microfracturation of the Eocene London or leper Clay and of the Oligocene Boom Clay has been well known to soil mechanics engineers for more than a century. Some authors [9] have related the microfracturing of the London Clay to local basement-induced tectonics. This hypothesis seems to be invalidated because microfracturing in the equivalent leper Clay is also observed in areas in Belgium where no basement-induced tectonic deformations are known. In addition, high-resolution reflection seismic investigations have revealed large-scale intraformational fault patterns in the London or leper Clay over their full extent in the Southern North Sea [10] and even over a large area of the basin axis in the Central and Northern North Sea [11]. Such patterns involve faults with a throw of several metres, sometimes up to 10 m, which however are confined to the clay layer and fade away towards its base and top boundary. Fault patterns have also been observed on quarry profiles in South Flanders, and are apparently similar to those observed on seismograms. An outstanding example is found in the Koekelberg quarry in Marke. The fault surfaces are generally characterized by a well-developed fault mirror with striae and a black fault gauge. A striking feature has been the discovery of microfossils within such gauge, originating from clay horizons about 60 m lower. These observations have led to a model, involving a build-up of undercompaction in the early burial history of the clays, and its subsequent relaxation through hydraulic fracturing, at fairly shallow depths [12]. The sealing of a pressure compartment would initially be established by preferential fluid drainage and compaction of units adjacent to more permeable strata. The development of a density inversion due to undercompaction resulted in a Rayleigh-Taylor instability, for which clues have been found in the Southern North Sea. This model has been endorsed by the Imperial College group, which investigated three-dimensional high-resolution seismic data in the Central and Northern North Sea [11]. This field evidence of an early major hydraulic fracturation and dewatering event, which left its scars under the shape of a general network of faults and intense microfracturing, deserves attention in any evaluation of the seal capacity of the leper Clay under renewed hydraulic and/or thermal stresses.".
- aggregation authorList BK189457.
- aggregation endPage "388".
- aggregation startPage "381".
- aggregation isDescribedBy 400573.
- aggregation similarTo LU-400573.