Evidence for a Variscan suture zone in the Vendée, France: a petrological study of blueschist facies rocks from Bois de Cené |
| |
| Authors: | M GUIRAUD J-P BURG R POWELL |
| |
| Institution: | Department of Geology, University of Melbourne, Parkville, Victoria, 3052, Australia |
| |
| Abstract: | Abstract In the Bois de Cené area, blueschist facies rocks, characterized by glaucophane and/ or chloritoid, provide evidence for a suture zone in the Variscan. This terrain is considered to be the eastern equivalent of the Ile de Groix high-pressure metamorphic terrain. Petrological study of the two characteristic types of rocks found in the area shows that the primary high-pressure paragenesis was modified during a retrogression which followed substantial decompression, probably at constant or decreasing temperature. The simplest interpretation is that this retrogression followed tectonic emplacement within a nappe pile. |
| |
| Keywords: | Key-words: blueschists chloritoid glaucophane Vendée France |
|
|
