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Geological Society, London, Special Publications; 1981; v. 9; p. 185-195;
DOI: 10.1144/GSL.SP.1981.009.01.17
© 1981 Geological Society of London

II. Rock Products of Thrusting

The Caledonides of northern Norway: relation between preferred orientation of quartz lattice, strain and translation of the nappes

A.-M. Boullier & J.-M. Quenardel

Centre Geologique et Geophysique, U.S.T.L., 34060 Montpellier Cedex, France
Laboratoire de Géologie Structurale, Univ. Paris Sud, 91405 Orsay, France

In the area of Birtavarre (eastern Troms) evidence of nappe tectonics exist at all scales. The preferred orientation of the c-axis of quartz shows a monoclinic symmetry and consists of a girdle containing Y and oblique to Z. The obliquity of the girdle-angle {vartheta} between the c-axis girdle and the YZ plane-is interpreted in terms of simple shear, and the strain is calculated from these data. The results from this study are: (1) almost all the quartz-bearing samples give a consistent sense of simple shear (movement towards the SE) except for some gneisses supposed to be allochthonous Precambrian. (2) the calculated strain is too low to explain the displacement of the nappes (more than 40 km for a 2 km thick unit): X/Z ratio is less than 10 on the average. Possible reasons for this are discussed.





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P. F. Williams, D. Jiang, and S. Lin
Interpretation of deformation fabrics of infrastructure zone rocks in the context of channel flow and other tectonic models
Geological Society, London, Special Publications, 2006; 268: 221 - 235.
[Abstract] [PDF]