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Thermoanalytical Dehydroxylation Of Clays And Combustion Of Organic Compounds In A Prograde Metamorphic Liassic Black Shale Formation, Central Swiss Alps


Thermoanalytical investigations (thermoanalysis combined with the analysis of the evolved gases) have been carried out on bituminous claystone samples from Switzerland with different diagenetic and metamorphic grades, ranging up to lower amphibolite facies. Mainly the course of water loss and the combustion of the organic compounds in flowing air were examined by thermoanalytical heating. The highest temperature of the structure water release from the samples was assigned to the dehydroxylation of the smectitic/illitic clays and muscovitic as well as paragonitic layer silicates, and is shown to be dependent on diagenetic and metamorphic grade. The highest temperature of combustion of the organic substance in the claystone samples is a better indication for the grade of diagenesis and metamorphism as the dehydroxylation. The increase of the highest temperatures of dehydroxylation and combustion of the organic compounds shows a similar trend as the isotopic ratio of C13/C12 (= 13C) the organic compounds with increasing degree of metamorphism.


Kahr, Günter and Madsen, Fritz and Frey, Martin

Index Terms:

Clay; ClayGroup

Further Information:

Date published: 1996