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Swiss Journal of Geosciences
Fig. 13 | Swiss Journal of Geosciences

Fig. 13

From: Geochemical signature of paleofluids in microstructures from Main Fault in the Opalinus Clay of the Mont Terri rock laboratory, Switzerland

Fig. 13

Secular variation of the 87Sr/86Sr ratio from world seawater (adapted from McArthur et al. 2001): the sketch a outlines the period from 280 to 200 Ma with the specific period highlighted by a red sector that corresponds to the hypothetic 87Sr/86Sr ratio framed as zone 1 on the 87Sr/86Sr ratio that de Haller et al. (2014) speculated as the Triassic fluid supply to the Opalinus Clay (OPA) (see text for further explanation). The sketch b presents the period between 210 and 130 Ma including the deposition time of the Opalinus Clay highlighted by the red sector that corresponds to the 87Sr/86Sr ratio outlined by the zone 2. The sketch c outlines the period from 70 to 30 Ma corresponding to the potential Priabonian marine seawater invasion outlined by the red sector with the corresponding 87Sr/86Sr ratio of the marine water in the zone 3. The sketch d outlines the most recent period between 30 and 0 Ma, giving the 87Sr/86Sr ratio of the Burdigalian seawater in the red sector with the corresponding 87Sr/86Sr ratio in the zone 4. More information is in the text

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