In the south-eastern Peloritani Mountains, the Alpine event can be divided into several cycles of different ages that took place in differing deformational environments, with peak metamorphic conditions reaching the greenschist facies. The first cycle produced ductile deformation accompanied by intense greenschist facies blastesis. The second cycle produced mylonitic and balstomylonitic rocks. A final, more superficial cycle resulted in the development of south verging macroscopic structures that also affect the tectonic contact between the two units. The Rb-Sr ages (278-79 Ma) of the white micas in the rocks of both the Hercynian basement and the cover are significantly younger than that of the Variscan regional metamorphism, and thus reveal the effects of the Alpine event. The youngest Rb-Sr age (26 Ma) indicates the approximate age of the peak of the Alpine metamorphism
Structural, Metamorphic and Geochronologic features of the Alpine event in the south-eastern sector of the Peloritani mountains (Sicily)
CIRRINCIONE, ROSOLINO;PEZZINO, Antonino
1994-01-01
Abstract
In the south-eastern Peloritani Mountains, the Alpine event can be divided into several cycles of different ages that took place in differing deformational environments, with peak metamorphic conditions reaching the greenschist facies. The first cycle produced ductile deformation accompanied by intense greenschist facies blastesis. The second cycle produced mylonitic and balstomylonitic rocks. A final, more superficial cycle resulted in the development of south verging macroscopic structures that also affect the tectonic contact between the two units. The Rb-Sr ages (278-79 Ma) of the white micas in the rocks of both the Hercynian basement and the cover are significantly younger than that of the Variscan regional metamorphism, and thus reveal the effects of the Alpine event. The youngest Rb-Sr age (26 Ma) indicates the approximate age of the peak of the Alpine metamorphismI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.