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Discriminating between tectonic and eustatic controls on the stratigraphic record in the Paris basin

Authors


Cécile Robin Fax: +33/1 44 27 49 65; E-mail: robin@ccr.jussieu.fr

Abstract

The quantification of tectonic and eustatic factors in the control of the sedimentary record is one of the main questions in sedimentary basin dynamics. We propose two methods allowing: (i) 3D measurement of accommodation at basin scale and (ii) to decipher between local (10–100 km wavelength) and basin-scale accommodation. The local signal is necessarily of tectonic origin, the basin-scale signal is of both eustatic and large tectonic origin. The measurement of accommodation requires (a) high-resolution time-lines calibrated in ages (sequence stratigraphy on well-logs and biostratigraphy on cores), (b) decompacted lithologies (well-logs), and (c) palaeodepth/palaeoaltitude (sedimentology and well-logs). Application of these methods to the intracratonic Paris basin during the Lias (early Jurassic) suggests a tectonic origin for the 1–5 Myr stratigraphic cycles, with basin-scale flexure during transgressive half-cycles, and 10–100 km uplift of basement units, during regressive half-cycles.

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