Organic nitrogen chemistry during low-grade metamorphism

Organic nitrogen chemistry during low-grade metamorphism

Most of the organic nitrogen (Norg) on Earth is disseminated in crustal sediments and rocks in the form of fossil nitrogen-containing organic matter. The chemical speciation of fossil Norg within the overall molecular structure of organic matter changes with time and heating during burial. Progressive thermal evolution of organic matter involves phases of enhanced elimination of Norg and ultima...

ORGANIC CHEMISTRY Organic Compounds containing Nitrogen

Sedimentology, Petrographic Variability, and Very-low-grade Metamorphism of the Champsaur Sandstone Alexander Frank Waibel

La faculte des sciences, sur le preavis de Messieurs M. VUAGNAT, professeur ordinaire (Departement de mineralogie) et W. WILDI, profes-seur ordinaire (Departement de geologie et paleontologie) codireeteurs de these, R. CHESSEX, professeur ordinaire (Departement de mineralo-gie), J. HUNZIKER, Professeur (Universite de Lausanne), C. KERKHOVE, professeur (Universite de Grenoble) et J. MARTINI, doc...

Investigation of leaching kinetics of zinc from a low-grade ore in organic and inorganic acids

The leaching kinetics of a low-grade zinc oxide ore in different acid media was investigated with respect to the experimental variables including acid concentration, temperature, liquid to solid (L/S) ratio, and stirring speed. The results obtained showed that the leaching reagent concentration and the reaction temperature exerted significant effects on the extraction of zinc, whereas the L/S r...

Nitrogen isotopic evolution of carbonaceous matter during metamorphism: Methodology and preliminary results

Nitrogen content and isotopic composition of carbonaceous-rich metasediments were determined by online and sealed-tube combustion using ultra-high vacuum line and static mass spectrometer adapted to analyse nitrogen nanomoles. Accurate measurements showed that nitrogen amount released by on-line combustion technique was underestimated to various extents. As a result, the nitrogen isotopic compo...