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Journal of the Geological Society; 1987; v. 144; issue.4; p. 671-674;
DOI: 10.1144/gsjgs.144.4.0671
© 1987 Geological Society of London

Article

The ammonium content of Caledonian granites

A. HALL

Department of Geology, Royal Holloway and Bedford New College, Egham, Surrey TW20 OEX, UK

The Caledonian granites of the British Isles have NH+4 contents in the range of 0–167 parts per million. High contents (>60 ppm) are confined to muscovite-rich granites, occurring principally in a restricted area, namely SE Ireland and the Isle of Man. Their magmas are inferred to have formed by the partial melting of a sedimentary protolith rich in organic matter. There is no apparent correlation between Formula content and initial 87Sr/86Sr ratios.





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