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The geochronology of the Connemara granites and its bearing on the antiquity of the Dalradian series


The geochronology of the Connemara granites and its bearing on the antiquity of the Dalradian series



Quarterly Journal of the Geological Society of London 122, Part 2(486): 91-118



DOI: 10.1144/gsjgs.122.1.0091

Extensive remapping of the Connemara basement in west Galway (Ireland) has made it possible to unravel the stratigraphy and the principal phases of movement and metamorphism of the Connemara schists, resulting in firm correlation of at least a part of the Connemara succession with the lower Dalradian sequence. The results of the first radiometric (Rb/Sr method) age determinations carried out on separated micas of the Connemara showed that an important metamorphism had affected the schists about 460-495 m.y. ago. These results and others from the Scottish Dalradian are almost confined to the range of 400-495 m.y. ago (Ordovician-Silurian). Thirty-eight rock samples from Connemara granites were dated by the Rb/Sr method. The radiometric age for the Ougtherard granite (510.

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