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Deep-rooted overthrusting and blueschistic metamorphism in compressive continental margins. An example from Calabria (Southern Italy)

Published online by Cambridge University Press:  01 May 2009

Giuseppe Piccarreta
Giuseppe Piccarreta
Affiliation:
Istituto di Mineralogia e Petrografia, Università di Bari, Via Nicolai 1, Bari, Italy
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Summary

At the base of austroalpine nappes in Calabria alpine greenschist dynamometamorphism is overprinted by blueschist metamorphism. Tectonic overpressures and deep-rooted movements of upthrusting type in compressive regime are the key to generation of blueschistic conditions and to greenschist-bluecschist evolution of metamorphism. The tectonic overpressures are generated because the rocks at higher confining pressures and lower pore pressures have relatively higher resistance to deformation. The evolution from greenschist to blueschist conditions results from cooling during upward motion with overpressures remaining concentrated along the thrust zones.

Type
Articles
Information
Geological Magazine , Volume 118 , Issue 5 , September 1981 , pp. 539 - 544
Copyright
Copyright © Cambridge University Press 1981

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