Paris, 4 place Jussieu 75252 Paris cedex 05; 'Agence Natwnale pour la Gestion des Dechets Radiwctifs (ANDRA), B.P. 38, route du Panorama Robert Schumrm, 92266 F o n t e n a y d u -k d x , France ABSTRACTThe 1356 Basel earthquake was the strongest event to have shaken NW Europe in the last thousand years. The peculiar location of this historical event makes it possible to relate it to normal faulting along the edges of the Rhine Graben, as well as to reverse faulting along the Jura frontal thrust or to fault reactivation within the Hercynian basement. Alternate hypotheses are discussed and their implications compared taking into account available structural data and results of the morphotectonic study performed in the epicentral area. This study combines field observations with the analysis of SPOT satellite imagery, aerial photographs, and detailed topography. It is concluded that the Basel earthquake most probably reactivated a basement fault (reverse or wrench fault) beneath the shallow-depth aseismic detachment that underlies the Jura Mountains.
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This study presents the first application of the U/Pb dating method to highly Pb-depleted diagenetic geodic calcites of the Jurassic formations of the Paris basin that leads to a reappraisal of the palaeohydrogeology history of this region. Composite U/Pb ages from multiple geodes, combined with δ 18 O analyses, reveal two main phases of diagenetic fluid circulations linked with major regional tectonic events. Dogger formations recorded a first diagenetic fluid episode at 147.8 ± 3.8 Ma, i.e. at the very beginning of the emersion of the basin during the Tithonian period and 30Ma earlier than previously assumed. δ 18 O results confirmed that most of the calcitic cement phases that closed the porosity of these formations Article text Click here to download Article text Pisapia_article_text.pdf
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