Université de Neuchâtel

Demise of the northern Tethyan Urgonian carbonate platform and subsequent transition towards pelagic conditions: The sedimentary record of the Col de la Plaine Morte area, central Switzerland

Föllmi, Karl B. ; Gainon, François

In: Sedimentary Geology, 2008, vol. 205, no. 3-4, p. 142-159

The sedimentary succession of the Col de la Plaine Morte area (Helvetic Alps, central Switzerland) documents the disappearance of the northern Tethyan Urgonian platform in unprecedented detail and suggests stepwise platform demise, with each drowning phase documented by erosion and phosphogenesis. The first identified drowning phase terminated Urgonian carbonate production in a predominantly...

Université de Neuchâtel

Les isotopes radioactifs de la série de l’uranium-238 (222Rn, 226Ra, 234U et 238U) dans les eaux thermales de Suisse : sites d’Yverdon-les-Bains, Moiry, Loèche-les-Bains, Saxon, Val d’Illiez, Bad Ragaz, Delémont, Lavey-les-Bains, Brigerbad et Combioula

Gainon, François ; Zwahlen, François (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th.2029.

Isotopes of the 238U series are naturally occurring in groundwater. The aim of this work is to measure 4 isotopes of this series (222Rn, 226Ra, 238U and 234U) in the context of deep groundwater, to study their geochemical behavior and finally to use this information for a better understanding of deep aquifers. The test sites are situated in...

Université de Neuchâtel

Conceptual model for the origin of high radon levels in spring waters – the example of the St. Placidus spring, Grisons, Swiss Alps

Gainon, François ; Goldscheider, Nicola ; Surbeck, Heinz

In: Swiss Journal of Geoscience, 2007, vol. 100, no. 2, p. 251-262

A variety of geological, hydrochemical and isotopic techniques were applied to explain the origin of exceptionally high radon levels in the St.Placidus spring near the city of Disentis in the Swiss Alps, where an average of 650 Bq/L 222Rn was measured. 222Rn is a radioactive noble gas with a half-life of 4 days, which results from the disintegration of radium...

Université de Neuchâtel

The Early Aptian Grünten Member : Description of a new lithostratigraphic unit of the helvetic Garschella Formation

Linder, Pascal ; Gigandet, Johann ; Hüsser, Jean-Luc ; Gainon, François ; Föllmi, Karl B.

In: Eclogae Geologicae Helvetiae, 2007, vol. 1, p. 1-5

Early Aptian sediments mostly referred to as “upper Orbitolina beds" are known from a relatively small number of outcrop areas throughout the distal part of the Helvetic Zone of Switzerland, Austria and Germany. These sediments are here formally defined as a new, basal member of the Garschella Formation; the Grünten Member. Equivalent and correlatable sediments also exist in the Vercors region...