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Geological Society, London, Special Publications; 1981; v. 9; p. 159-165;
DOI: 10.1144/GSL.SP.1981.009.01.14
© 1981 Geological Society of London

II. Rock Products of Thrusting

Very low grade metamorphism with a reverse gradient induced by an overthrust in Haute-Savoie (France)

J. Aprahamian & J.-L. Pairis

Institut Dolomieu. Laboratoire associé au C.N.R.S. n° 69. Rue Maurice-Gignoux, 38031 Grenoble Cedex-France

The observed distribution of metamorphic transformations, using: (1) the metamorphic facies of Taveyanne Sandstones, (2) the mineralogical composition of the argillaceous fraction (which shows index minerals like paragonite, corrensite and allevardite), (3) the crystallinity indices of the illites, enables us to show that a reverse gradient (the maximum of which must be located in the thrust plane) is superimposed on the already known gradient which decreases both towards the top of the series and towards the external part of the chain.

To account for the observed relationships, we propose that heat was produced by friction along the thrust plane; the theoretical implications of such a model are discussed.

It is pointed out that such a reversed metamorphic gradient will only be observed following favourable circumstances of nappe thickness, rate of motion, thermal properties of the rocks and rate of erosion.





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C. W. K. Morrison and G. J. H. Oliver
A study of illite crystallinity and fluid inclusions in the Kathmandu Klippe and the Main Central Thrust zone, Nepal
Geological Society, London, Special Publications, 1993; 74: 525 - 540.
[Abstract] [PDF]