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The complex was deformed and metamorphosed to amphibolite facies subsequent to emplacement so that this age is a maximum for these orogenic events in the western Moine Series. Other age data indicate that amphibolite facies conditions associated with pegmatite emplacement continued until ca. 430 Ma contrasting with the north-east Highlands where tectonism and metamorphism was completed by 460 Ma ago. The disparity between hornblende and mica K-Ar ages suggests that cooling from 500 to 300\u00b0C took about 20 Ma. Higher blocking temperatures are indicated for U-Pb in monazite and sphene than for U-Pb in apatite.<\/jats:p>","DOI":"10.1144\/sjg15010049","type":"journal-article","created":{"date-parts":[[2010,1,15]],"date-time":"2010-01-15T00:29:39Z","timestamp":1263515379000},"page":"49-62","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":79,"title":["Age of the Glen Dessary Syenite, Inverness-shire: diachronous Palaeozoic metamorphism Across the Great Glen"],"prefix":"10.1144","volume":"15","author":[{"given":"O.","family":"van Breemen","sequence":"first","affiliation":[{"name":"Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow"}]},{"given":"Margaret","family":"Aftalion","sequence":"additional","affiliation":[{"name":"Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow"}]},{"given":"R. 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