Quantitative approach of the cleavage evolution in the Dinant allochton (Ardennes, France and Belgium)
1996
Sintubin, M. (Katholieke univ. Leuven (Belgium). Lab. voor algemene geologie)
A qualitative description of the cleavage evolution in the Dinant Allochthon indicates a gradual decrease in intensity of the cleavage development from the Ardennes Anticline towards the North. In this paper the cleavage evolution in the Dinant Allochthon is approached more quantitatively by means of an X-ray texture analysis, in which the phyllosilicate preferred orientation, causing cleavage development, is determined. This quantitative approach shows that the Dinant Allochthon can definitively not be considered as a domain with a uniform cleavage development. Only the Ardennes Anticline is characterized by the development of a pervasive slaty cleavage, which can be associated with the Variscan metamorphism. Towards the North the cleavage development rapidly decreases in intensity. Lithological composition and local strain conditions become the controlling parameters. Only in the direct proximity of faults or in localized shear zones does the phyllosilicate preferred orientation indicate a tectonic origin of the cleavage fabric.
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