1. Late pervasive crustal-scale extension in the south Armorican Hercynian belt (Vende´e, France)
- Author
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Cagnard, Florence, Gapais, Denis, Brun, Jean Pierre, Gumiaux, Charles, and Van den Driessche, Jean
- Subjects
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SEDIMENTARY rocks , *ROCKS , *GRANITE - Abstract
The coast of Vende´e, 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. [Copyright &y& Elsevier]
- Published
- 2004
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