Zircon U-Pb ages from the Galway granite and the Dalradian, Connemara, Ireland

摘要: Synopsis The zircon U-Pb age of 510±10 m.y. the Cashel-Lough Wheelaun basic intrusion establishes a point early in time span Dalradian metamorphism Connemara; is post F 1 and late M but pre-F 2 . This also maximum for base Lower Llanvirn can be linked with Rb-Sr results if 5.0 × 10 y Rb 87 half-life used. metasedimentary are compatible an isotopic disturbance(s) between 400 510 suggest that large proportion source rocks were older than 1200 relationships zircons have similar features to those cogenetic suites.