Affiner les résultats

Collection spécifique

Langue

Université de Fribourg

How mineralogy and geochemistry can improve the significance of Pb isotopes in metal provenance studies

Baron, S. ; Tămaş, Calin-Gabriel ; Carlier, C. Le

In: Archaeometry, 2014, vol. 56, no. 4, p. 665–680

Lead isotopes combined with trace element data represent a powerful tool for non-ferrous metal provenance studies. Nevertheless, unconsidered geological factors and archaeological data, as well as ignored analytical procedures, may substantially modify the interpretation of the isotopic and trace element signature obtained as a potential ore candidate. Three archaeological examples, accompanied...

Université de Neuchâtel

Groundwater flow, heat and mass transport in geothermal systems of a Central Alpine Massif. : The cases of Lavey-les-Bains, Saint-Gervais-les-Bains, and Val d'Illiez

Sonney, Romain ; Perrochet, Pierre (Dir.) ; Vuataz, François-David (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

Groundwater flow, heat and mass transport in geothermal or hydrothermal systems locally occurs in the Alps Range where a series of precise conditions are met such as active downflow, permeability at depth, concentrated and fast upflow and favorable geomorphological surface patterns. Advanced studies of the regional and local geology, thermal water chemistry, mixing processes, infiltration area,...

Université de Neuchâtel

Biogeochemical changes during the Cenomanian-Turonian Oceanic Anoxic Event (OAE 2)

Mort, Haydon ; Adatte, Thierry (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2006 ; 1933.

Understanding how nutrients behave during sub-oxic environments is crucial in predicting future changes in the ocean-climate system. This study focuses on the role of phosphorus, in its different sedimentary reservoirs, during the Cenomanian-Turonian anoxic event (OAE 2), which occurred during the late Cretaceous (~93.5 Ma). In the geological record this period in the Earth’s history is...

Université de Neuchâtel

Cadmium anomalies in Jurassic carbonates (Bajocian, Oxfordian) in western and southern Europe

Rambeau, Claire ; Föllmi, Karl B. (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2006 ; 1858.

The trace metal cadmium (Cd) is a highly toxic element, with adverse effects both on human health as well as on ecosystem equilibriums. Its transfer into the environment occurs by the mediation of natural and anthropogenic processes. Important natural sources comprise volcanic emissions and the biogeochemical weathering of Cd-enriched rocks, such as phosphorites or organic-rich deposits. This...

Université de Neuchâtel

Late Cretaceous to early Paleocene climate and sea-level fluctuations : the Tunisian record

Adatte, Thierry ; Keller, Gerta ; Stinnesbeck, Wolfgang

In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2002, vol. 178, p. 165-196

Climate and sea-level fluctuations across the Cretaceous–Tertiary (K–T) transition in Tunisia were examined based on bulk rock and clay mineralogies, biostratigraphy and lithology in five sections (El Melah, El Kef, Elles, Ain Settara and Seldja) spanning from open marine to shallow inner neritic environments. Late Campanian to early Danian trends examined at El Kef and Elles indicate an...