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Far-field brittle deformation record in the eastern Paris Basin (France)

Blaise, Thomas and Ali Khoudja, Sid Ahmed and Carpentier, Cédric and Brigaud, Benjamin and Missenard, Yves and Mangenot, Xavier and Boulvais, Philippe and Landrein, Philippe and Cochard, Jean (2022) Far-field brittle deformation record in the eastern Paris Basin (France). Geological Magazine . ISSN 0016-7568. doi:10.1017/s0016756822000772. (In Press)

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Jurassic carbonate strata in the eastern Paris Basin exhibit several generations of faults, tension gashes and stylolites. Although their relative chronology can sometimes be determined according to cross-cutting relationships, the duration of major deformation phases and their influence on fluid flow and carbonate cementation are still uncertain. This contribution aims to clarify the timing of brittle deformation and associated calcite cementation. Tension gashes filled by calcite in Jurassic carbonates were sampled in outcrops and boreholes and dated through U–Pb geochronology. Almost all the sampled fractures were cemented during the Cenozoic period. Continuous deformation spread from c. 50 to 30 Ma. Tension gashes oriented N10° to N20° dated at 48–43 Ma show the main Pyrenean contractional stage. A second set of calcites were dated at c. 35–33 Ma and document a Late Eocene – Oligocene extension. A transition from the compressional to the extensional regime is expressed by tension gashes dated between 43 and 35 Ma. Finally, tension gashes oriented N150° to N175°, dated between 32 and 18 Ma, may result from the propagation of the horizontal stress generated by the Alpine orogen or by late Pyrenean deformation. Clumped isotope thermometry on five samples revealed both low crystallization temperatures (from 27 to 53 °C) and the meteoric origin of calcite-precipitating fluids. Our research therefore documents a continuous fracturing from Ypresian to Rupelian times, and less expressed brittle deformation during the Miocene period.

Item Type:Article
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URLURL TypeDescription
Blaise, Thomas0000-0003-1820-8152
Carpentier, Cédric0000-0002-0459-3195
Brigaud, Benjamin0000-0001-6961-2177
Missenard, Yves0000-0001-7484-7544
Mangenot, Xavier0000-0001-8770-6767
Boulvais, Philippe0000-0002-0127-4711
Landrein, Philippe0000-0003-0097-2523
Additional Information:This manuscript benefited from fruitful discussion with Christian Hibsch. We also thank Frédéric Haurine for his assistance during the LA-ICP-MS U–Pb analysis. This work is the outcome of a collaborative project between the University Paris-Saclay and Andra, the French agency for radioactive waste management, funded in part by Andra. We thank the two anonymous reviewers for their constructive comments that helped to improve the manuscript.
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University Paris-SaclayUNSPECIFIED
Record Number:CaltechAUTHORS:20221024-125854800.33
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ID Code:117562
Deposited By: Research Services Depository
Deposited On:01 Nov 2022 20:32
Last Modified:01 Nov 2022 20:32

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