Low δ18O magma, Isle of Skye, Scotland; evidence from zircons

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doi: 10.1016/S0016-7037(97)00297-4
Authors:Gilliam, Carrie E.; Valley, John W.
Author Affiliations:Primary:
University of Wisconsin, Department of Geology and Geophysics, Madison, WI, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 61(23), p.4975-4981. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1997
Note:In English. 31 refs.; illus., incl. 1 table, geol. sketch map
Summary:Analyses are presented of O isotope ratios of minerals from granites and Lewisian gneiss (zircons, quartz); Δ18O ranges from 1.69 to 4.380/00 (VSMOW) for zircons from granites, and 4.79-5.310/00 for zircons from a xenolith from the Lewisian gneiss. These values are compared to those of zircons from Kimberley, South Africa. The Δ18O values for the zircons from Tertiary granites for the Western Red Hills represent the true magmatic compositions with low Δ18O (up to 6.00/00). Zircons from the Lewisian basement are isotopically distinct from the Tertiary zircons. Δ18O of quartz grains separated from the granites are close to the calculated magmatic Δ18O. The genesis of the Western Red Hills granites is discussed; it is possible that they differentiated from a mafic melt originally low in Δ18O, or alternatively they originated through melting of hydrothermally altered country rocks. [R.K.H.]
Subjects:Cenozoic; Geochemistry; Granites; Igneous rocks; Intrusions; Isotope ratios; Isotopes; Magmas; Nesosilicates; O-18/O-16; Orthosilicates; Oxygen; Plutonic rocks; Silicates; Stable isotopes; Tertiary; Zircon; Zircon group; Europe; Great Britain; Hebrides; Highland region Scotland; Inner Hebrides; Inverness-shire Scotland; Isle of Skye; Scotland; United Kingdom; Western Europe; Western Red Hills Complex
Coordinates:N570000 N574000 W0054000 W0064500
Abstract Numbers:98M/2774
Record ID:1998012811
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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