Fatima Lillouch : Connect in order to contact the contributor. Search Access content directly Footer. Sign in. Search Loading Search using SolR syntax. Search using SolR syntax Run the search. Journal Articles Mineralogy and Petrology Year : Columnar structures in pyrometamorphic rocks associated with coal-bearing spoil-heaps burned by self-ignition, La Ricamarie, Loire, France. Broekmans 7, 8. Box Torgarden, Trondheim - Norway Centre for Materials and Processes.
Maarten A. Broekmans Function : Author Department of Laboratory. Geological Survey of Norway. Abstract en. Here, the comparison between paralavas and volcanic rocks is mainly made from the point of view of the solidification process. They are irregular; they form prisms of ca. We report on geological, mineralogical, petrographical, geochemical, petrophysical anisotropy of magnetic susceptibility, AMS studies, focusing on the columns.
Heterogeneities with cylindrical symmetry from the center to the rim of the columns are observed at the decimeter scale, both for geochemistry variation of Zn is conspicuous and AMS studies. These contribute to the understanding of the genesis of the columns, favoring the fingering hypothesis: formation of digitations within a phenomenon of constitutional supercooling fingers of the solid grow at the expense of the liquid.
Among the volatiles playing a role in this phenomenon, the role of Cl as a ligand to Zn in the melt deserves attention the situation is different in standard basaltic rocks, where the role of H 2 O with respect to other volatiles is more important; Cl may be abundant as a companion to coal. Keywords en. Domains Chemical and Process Engineering. Files and preview Fichier principal.
Origin Files produced by the author s. Cited literature Loading Dates and versions emse , version 1 Mineralogy and Petrology , In press, , pp. Share More.
