Xenoliths and their implications for the deep geology of the Midland Valley of Scotland and adjacent regions

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Authors:Upton, Brian G. J.; Aspen, Peder; Hunter, Robert H.
Author Affiliations:Primary:
Univ. Edinburgh, Grant Inst. Geol., Edinburgh, United Kingdom
Volume Title:Deep geology of the Midland Valley of Scotland and adjacent regions
Volume Authors:Bowes, D. R., chairperson
Source:Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.75 ( Part 2), p.65-70; Deep geology of the Midland Valley of Scotland and adjacent regions; symposium, Edinburgh, United Kingdom, Oct. 18-19, 1983, chaired by D. R. Bowes. Publisher: Royal Society of Edinburgh, Edinburgh, United Kingdom. ISSN: 0263-5933
Publication Date:1984
Note:In English. 26 refs.; illus. incl. 1 table, sect., sketch map
Summary:Late Palaeozoic alkali basalts in the Midland Valley contain a variety of 'plutonic' xenoliths. The upper mantle is dominantly magnesian peridotite in which a younger component is represented by pyroxene-rich xenoliths (wehrlites, clinopyroxenites and garnet pyroxenites). Biotite-rich ultramafic xenoliths are probably samples of metasomatized upper mantle facies. Xenoliths of plagioclase and clinopyroxene + or - orthopyroxene + or - magnetite are common and may represent lower crust; garnet granulites are rare but anorthosites common. The lower crust may consist largely of stratified metacumulate bodies. Tonalitic and trondhjemitic gneisses probably represent a mid-crustal domain beneath deformed Upper Precambrian and Lower Palaeozoic supracrustals. Widespread metasedimentary rocks are also regarded as mid-crustal. [I.P.]
Subjects:Alkali feldspar; Anorthoclase; Clinopyroxenite; Composition; Feldspar group; Framework silicates; Garnet pyroxenite; Igneous rocks; Inclusions; Paleozoic; Peridotites; Petrology; Plutonic rocks; Pyroxenite; Silicates; Ultramafics; Upper Paleozoic; Wehrlite; Xenoliths; Europe; Great Britain; Midland Valley; Scotland; United Kingdom; Western Europe; Glimmerite
Coordinates:N550000 N550000 W0050000 W0050000
Abstract Numbers:85M/3277
Record ID:1985057504
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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