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Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France).

Muriel Rocher a, Stéphane Baize a , Stéphane Jaillet b , Edward Marc Cushing a , Yannick Lozac’h a , Francis Lemeille a

C. R. Geoscience 335 (2003) 701–708

Document type > *Article de revue

Keywords > earthquakes

Research Unit > IRSN/DEI/SARG/BERSSIN

Authors > BAIZE Stéphane, CUSHING Edward, LEMEILLE Francis

Publication Date > 15/12/2003

Summary

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ 1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena.

a IRSN, BP 17, 92262 Fontenay-aux-Roses cedex, France

b UMR CNRS 7566 G2R, université Henri-Poincaré, Nancy-1, BP 239, 54506 Vandoeuvre-lès-Nancy, France


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