Contrasted metamorphic evolutions in thrusted cover units of the Briançonnais zone (French Alps): A model for the conservation of HP-LT metamorphic mineral assemblages

Details Contrasted metamorphic evolutions in thrusted cover units of the Briançonnais zone (French Alps): A model for the conservation of HP-LT metamorphic mineral assemblages Contrasted metamorphic evolutions in thrusted cover units of the Briançonnais zone (French Alps): A model for the conservation of HP-LT metamorphic mineral assemblages

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68..351g&link_type=abstract

Earth and Planetary Science Letters, Volume 68, Issue 2, p. 351-360.

Physics

21

Scientific paper

The evolution of organic matter, silicate and fluid phases in cover units of the three structural zones of the Vanoise area allows one to distinguish different P-T cooling paths. These paths depend on whether the cover has been transported (western and northern Vanoise) or not (southern Vanoise). All units first underwent a common high-pressure, low-temperature (HP-LT) metamorphic stage (300°C 6 kbar) of blueschist type (Fe/Mg carpholite-chloritoid facies). The cover units transported on the extermal, colder zone (coal measure series metamorphosed in albite-chlorite facies), preserved their HP mineralogy (Fe/Mg carpholite, lawsonite) and organic matter content (oils, wet gases and kerogen) while the unit which remained in contact with its more thermally conductive basement (polymetamorphic) now shows extensive greenschist facies overprinting (breakdown of Fe/Mg carpholite and lawsonite, appearance of chlorite, pyrophyllite, chloritoid and clinozoisite; absence of oils and wet gases). These two tectonic evolutions might serve as a more general model for the preservation of HP-LT mineral assemblages.

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