Stable isotopes in the continental lithospheric mantle

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Authors:Kyser, T. Kurtis
Author Affiliations:Primary:
Univ. Sask., Dep. Geol. Sci., Saskatoon, SK, Canada
Volume Title:Continental mantle
Volume Authors:Menzies, Martin A., editor
Source:Continental mantle, edited by Martin A. Menzies. Oxford Monographs on Geology and Geophysics, Vol.16, p.127-156. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0952-7028. ISBN: 0-19-854496-0
Publication Date:1990
Note:In English. 113 refs.; illus. incl. 1 table, sects.
Summary:Isotope ratios of O, H and S in minerals from alpine peridotites, mafic lavas and mantle xenoliths indicate that both the oceanic and continental lithospheric mantles vary more substantially in isotopic composition of these elements than expected from small fractionations at high T. The delta 18O values vary from 5 to 7.5 per mille in the oceanic lithosphere, whereas samples from the continental lithosphere reflect a much greater variation from 2 to 8 per mille. The deltaD values range from approx -120 to +8 per mille and delta34S values range from -5 to +11 per mille, but the oceanic mantle has relatively constant deltaD and delta34S values near -80 and -1 per mille, respectively. The two most important processes affecting the stable isotope composition of the continental lithosphere are the subduction of material altered at the surface and melts from the asthenosphere. [R.A.H.]
Subjects:D/H; Deuterium; Geochemistry; Hydrogen; Isotopes; Mantle; O-18/O-16; Oxygen; S-34/S-32; Stable isotopes; Sulfur; Upper mantle; Continental mantle; Ratios
Abstract Numbers:91M/2049
Record ID:1991014734
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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