First shrimp-ages on pyroxenites, eclogites and granites of the Ronda complex and its country-rocks
Primeras dataciones con SHRIMP de piroxenitas, eclogitas y granitos de las Peridotitas de Ronda y rocas encajantes
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Publication Date
1996 -
Publisher
Sociedad Geológica de España -
Abstract
U-Pb shrimp dating of magmatic and metamorphic domains of zircons from various rocks of the Ronda Peridotites (Betic Cordilleras, SE Spain) and their country rocks gave the following results: An extensional stage at ca 780 Ma is reported by the crystallization of a HP-garnet pyroxenite and the LP- protolith of a country-rock eclogite. Miocene subduction (20.1+2.0 Ma) caused the formation of the country-rock eclogites. Very fast uplift and emplacement of the ultramafic rocks into middle crustal level producéd contact anatectic granites at 22.9+3.4 Ma implying very fast uplift rates (>2 cm/y)