Stable isotope evidence on the nature of crust-mantle interactions

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Authors:Graham, Colin M.; Harmon, Russell S.
Author Affiliations:Primary:
Univ. Edinburgh, Inst. Geol. Sci., Edinburgh EH9 3JW, United Kingdom
Other:
South. Methodist Univ., Dep. Geol. Sci., United States
Volume Title:Continental basalts and mantle xenoliths; papers prepared for a UK Volcanic Studies Group meeting at the University of Leicester
Volume Authors:Hawkesworth, C. J.; Norry, M. J.
Source:p.20-45; UK Volcanic Studies Group meeting; Continental basalts and mantle xenoliths, Leicester, United Kingdom, Jan. 1983, C. J. Hawkesworth and M. J. Norry. Publisher: Shiva Publ., Nantwich, United Kingdom. ISBN: 0-906812-34-8
Publication Date:1983
Note:In English; illus. incl. 1 table
Summary:Recent stable-isotope data indicate that significant mantle heterogeneities exist for both O and H isotopes. Mantle O-isotope variation may be the result of crystal-liquid O-isotope fractionations at high T during partial melting, or of remelting of subducted altered oceanic crust. Mantle H with relatively high D/H ratio, as found in amphiboles from mafic/ultramafic inclusions in calc-alkaline rocks, is probably derived from dehydration of subducted hydrated basaltic oceanic crust, while mantle H with low D/H ratios may be truly 'primordial'. Combined stable and radiogenic isotope variations within suites of recent volcanic rocks from Grenada, Roccamonfina and the Andes have identified the involvement of crustal material both by recycling into mantle source-regions and by crustal contamination of ascending magmas. [R.A.H.]
Subjects:Basalts; Crust; Geochemistry; Igneous rocks; Inclusions; Isotopes; Magmas; Mantle; Melting; Metasomatism; O-18/O-16; Oxygen; Petrology; Plutonic rocks; Processes; Stable isotopes; Ultramafics; Volcanic rocks; Xenoliths
Abstract Numbers:84M/1702
Record ID:1986079632
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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