Age and significance of the North Pyrenean metamorphism

Details Age and significance of the North Pyrenean metamorphism Age and significance of the North Pyrenean metamorphism

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..40..327a&link_type=abstract

Earth and Planetary Science Letters, Volume 40, Issue 3, p. 327-332.

Physics

17

Scientific paper

39Ar-40Ar and 87Rb-87Sr studies of some metamorphic minerals from the North Pyrenean zone indicate that they crystallized about 92-104 m.y. ago on the east, 85 m.y. or older on the west. An amphibole from a lherzolite in the eastern area gives a plateau age at 103 m.y. The North Pyrenean metamorphism is shown to be a thermal effect of forcible lherzolite emplacement along the North Pyrenean zone. This latter process is related to the early breakup of the Europe-Iberia plate during the middle Cretaceous time.

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