Abstract
Abstract The so-called ‘Porphyroides’ Unit of South Brittany is located below units marked by an early HP–LT event (blueschists from the Ile de Groix) and above units marked by Upper Carboniferous HT metamorphism. P – T estimates in the Porphyroides (at Belle-Ile-en-Mer), using the phengite–chlorite thermobarometer, indicate pressures around 8 kbar and temperatures of 350–400 °C. These new estimates suggest that the early tectonic history of the ‘Porphyroides’ should be linked to that of the overlying Blueschists, and imply a much larger areal extension of the HP–LT domain in this part of the Hercynian Belt. To cite this article: F. Le Hebel et al., C. R. Geoscience 334 (2002) 205–211.
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