Isotopic and chemical constraints on the development of peraluminous Caledonian and Acadian granites

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Authors:Halliday, A. N.; Stephens, W. E.; Harmon, R. S.
Author Affiliations:Primary:
Scott. Univ. Res. and React. Cent., Glasgow, Scotland, United Kingdom
Other:
Univ. St. Andrews, United Kingdom
Volume Title:Peraluminous granites
Volume Authors:Clarke, D. B., editor
Source:The Canadian Mineralogist, Vol.19(Part 1), p.205-216; Joint annual meeting of the Geological Association of Canada and the Mineralogical Association of Canada, Halifax, NS, Canada, May 19, 1980, edited by D. B. Clarke. Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada. ISSN: 0008-4476
Publication Date:1981
Note:In English with French summary. 56 refs.; illus. incl. 1 table, sketch map
Summary:Peraluminous magmas may be generated by 1) melting of diopside-normative parental materials; 2) fractional crystallization of amphibole; 3) anatectic melting of peraluminous parental materials; 4) assimilation of peraluminous materials by metaluminous magmas. The use of 87Sr/86Sr and 18O/16O ratios, together with information on petrology, chemistry and geological relationships, is necessary in order to distinguish between these mechanisms. Interpretation of the origins of the Scottish Caledonian granites of the NE Grampian region, the Strontian and Foyers complexes and granites of the Southern Uplands and the Acadian South Mountain batholith of Nova Scotia were made using these criteria. The characteristics of the plutons are best explained if they originated through fusion or assimilation of crustal rocks. Vapour-phase transfer of components of the melt and fractional crystallization may explain local variations in the Al2O3/(CaO + Na2O + K2O) ratio. [S.A.K.]
Subjects:Acadian Phase; Alkaline earth metals; Caledonian Orogeny; Country rocks; Devonian; Genesis; Geochemistry; Granites; Igneous rocks; Isotopes; Magmas; Metals; Nesosilicates; O-18/O-16; Orthosilicates; Oxygen; Paleozoic; Petrology; Plutonic rocks; Possibilities; Silicates; Sr-87/Sr-86; Stable isotopes; Strontium; Zircon; Zircon group; Canada; Eastern Canada; Europe; Grampian Highlands; Great Britain; Maritime Provinces; Nova Scotia; Scotland; Scottish Highlands; South Mountain Batholith; Southern Uplands; United Kingdom; Western Europe; Foyers; Peraluminous granite; Ratios; Strontian
Abstract Numbers:86M/0670
Record ID:1982014436
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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