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The coast of Vendee, in the southern Hercynian Armorican Massif, shows a complete Barrovian metamorphic section, from upper-crustal low-grade metasediments, down to high-grade partially molten rocks. The bottom of the pile is intruded by numerous synkinematic granitic dykes. The pattern of the dyke array shows that syn-emplacement deformation combined coaxial sub-vertical shortening and sub-horizontal shearing. Strain estimates using dykes and deformed metamorphic isogrades suggest a maximum amount of bulk shortening in the range of 80%. Results are consistent with extensional tectonics mainly accommodated by large pervasive thinning, rather than by strain localisation along a detachment zone. q 2003 Elsevier Ltd. All rights reserved. |
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