NDLI: Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin ( Canton Jura , Switzerland )

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Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin ( Canton Jura , Switzerland )

Content Provider	Semantic Scholar
Author	Mazurek, Martin Haller, Antoine De
Copyright Year	2018
Abstract	Data pertinent to pore-water composition in Opalinus Clay in the Mont Terri and Mont Russelin anticlines have been collected over the last 20 years from longterm in situ pore-water sampling in dedicated boreholes, from laboratory analyses on drillcores and from the geochemical characteristics of vein infills. Together with independent knowledge on regional geology, an attempt is made here to constrain the geochemical evolution of the pore-waters. Following basin inversion and the establishement of continental conditions in the late Cretaceous, the Malm limestones acted as a fresh-water upper boundary leading to progressive out-diffusion of salinity from the originally marine pore-waters of the Jurassic low-permeability sequence. Model calculations suggest that at the end of the Palaeogene, pore-water salinity in Opalinus Clay was about half the original value. In the Chattian/Aquitanian, partial evaporation of sea-water occurred. It is postulated that brines diffused into the underlying sequence over a period of several Myr, resulting in an increase of salinity in Opalinus Clay to levels observed today. This hypothesis is [...] MAZUREK, Martin, DE HALLER, Antoine. Pore-water evolution and solute-transport mechanisms in Opalinus Clay at Mont Terri and Mont Russelin (Canton Jura, Switzerland). Swiss Journal of Geosciences, 2017, vol. 110, no. 1, p. 129-149 DOI : 10.1007/s00015-016-0249-9
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://archive-ouverte.unige.ch/files/downloads/0/0/1/0/1/0/8/0/unige_101080_attachment01.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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