Transpressional tectonics and Carboniferous magmatism in the Limousin, Massif Central, France: Structural and 40Ar/39Ar investigations

Details Transpressional tectonics and Carboniferous magmatism in the Limousin, Massif Central, France: Structural and 40Ar/39Ar investigations Transpressional tectonics and Carboniferous magmatism in the Limousin, Massif Central, France: Structural and 40Ar/39Ar investigations

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007tecto..26.2008g&link_type=abstract

Tectonics, Volume 26, Issue 2, CiteID TC2008

Computer Science

1

Geochronology: Thermochronology, Mineralogy And Petrology: Magma Genesis And Partial Melting (1037), Mineralogy And Petrology: Petrography, Microstructures, And Textures, Planetary Sciences: Solid Surface Planets: Tectonics (8149)

Scientific paper

New structural, microstructural, and 40Ar/39Ar data from the NW Massif Central (France) provide additional constraints on the timing and tectonic setting of late Variscan granite magmatism. Previous studies had emphasized the role of late orogenic extension in the emplacement of granite plutons in the Limousin region. In contrast, the new data set is consistent with syntectonic emplacement of magma in a dextral simple shear active from 350 to 300 Ma in a transpressional regime. As an alternative hypothesis to late orogenic extension, we propose that magmas migrated into tensional bridges between active P shears associated with a lithospheric shear zone comparable to a pop-up structure. The Galician region, in the western end of the Ibero-Armorican tectonic arc, exhibits major left-lateral ductile shear zones which can be interpreted as conjugate structures to the Limousin and Armorican shear zones.

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