Element mobility associated with meta-shear zones within the Ben Hope amphibolite suite, Scotland

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doi: 10.1016/0009-2541(83)90069-4
Authors:Floyd, P. A.; Winchester, J. A.
Author Affiliations:Primary:
Univ. Keele, Dep. Geol., Keele, Staffs., United Kingdom
Volume Title:Chemical Geology
Source:Chemical Geology, 39(1-2), p.1-15. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1983
Note:In English. 1 p. refs.; illus. incl. sketch map, anal., table
Summary:Planar sequences of biotite-garnet schists enclosed in the orthoamphibolites of the Ben Hope sill suite of N Scotland are interpreted as the products of synmetamorphic shearing. These meta-shear zones and the adjacent biotite amphibolites contain higher values of K2O, Rb and Ba than the surrounding main series of amphibolites. Accompanying the metasomatic introduction of these elements by hydrous fluids derived from an external metasedimentary source, Ca, Mg, Mn, Na and Sr were either depleted or redistributed in both the meta-shear zones and, to a lesser degree, in the adjacent amphibolites. The abundance and interelement relationships of the immobile group (TiO2, P2O5, Zr, Y, Nb and LREE) do not appear to have been markedly disturbed during metasomatism. Their stability is probably the result of the specific secondary assemblages that developed in the meta-shear zones and the low water/rock ratios or fluid throughout. However, caution is needed in using immobile element abundances to characterize chemically amphibolite shear zones in meta-basic sequences. Average chemical compositions (5) of different segments of the Ben Hope main amphibolite suite and 24 metasomatized amphibolites are presented. [P.Br.]
Subjects:Amphibolite facies; Amphibolites; Facies; Geochemistry; Major elements; Metals; Metamorphic rocks; Metasomatism; Mineral assemblages; Mobility; Orthoamphibolite; Petrology; Rare earths; Shear zones; Trace elements; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Ben Hope Suite
Abstract Numbers:83M/4770
Record ID:1985040879
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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