ISSN:
1365-3121
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
Notes:
Pervasive L and L ≪ S tectonites of the Mariánské Lázně eclogites include pencil fabrics, constrictional folds and mullions, that result from the first deformation increment observed. Petrological and microstructural data suggest that these structures formed by constrictional flow at deep subduction levels after, or even during, the eclogite facies stage and before the subsequent high-pressure granulite facies overprint. Constriction at mantle depths is explained by taking into account the geometry and seismic properties of recent subduction zones. Here, constrictional strain and associated L ≫ S tectonites should be expected below the rheologycontrolled slab bend (at about 40 km depth), where dip-parallel extension and a reduced viscosity of the downgoing slab are compatible with a coaxial flow regime.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-3121.1997.tb00019.x
