Crustal controls on the genesis of the 400 Ma old Caledonian granites

Details Crustal controls on the genesis of the 400 Ma old Caledonian granites Crustal controls on the genesis of the 400 Ma old Caledonian granites

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...35...89h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 35, Issue 1-3, p. 89-104.

Physics

8

Scientific paper

The c.400 Ma Caledonian granitoids of the British Isles form a high-K calc-alkaline suite with low K/Na compared with European Hercynian or Australian Caledonian granites. The granites south of the Iapetus suture are largely S-types and occur within thick geosynclinal prisms of Lower Palaeozoic flysch sediments. The granitoids north of the Iapetus suture are largely I-types with high Ba and Sr and with evidence of a significant component of continental crust. The overall isotopic features of the granitoids show similarities with Lower Palaeozoic sediments. This is owing to both representing averages of the available crust plus material derived from the mantle. The available data are compatible with only a small amount of Lewisian material incorporated in the magmas and most of the crust involved was of Late Precambrian or Lower Palaeozoic age. The high Sr characteristics of the British Isles 400 Ma granitoids (a feature generally coupled with absence of a major Eu anomaly) is best explained in terms of melting of a feldspar absent source which had not gone through a previous feldspar fractionation cycle. This is compatible with the source being chiefly mantle, and/or lower crust that had not had an upper crustal history. The existence of a chemical province within the British Isles Caledonian precludes the possibility that the granites have been brought into their present positions by large sinistral movements as has recently been suggested. The high Na nature of the province is not due to more extensive seawater metasomatism in the source.

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