The comparative geochemistry of some Highland pelites (anomalous local limestone-pelite successions within the Moine outcrop; II)

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doi: 10.1144/sjg22010107
Authors:Rock, N. M. S.; Macdonald, R.; Szucs, T.; Bower, J.
Author Affiliations:Primary:
Br. Geol. Surv., Edinburgh, United Kingdom
Other:
Univ. Lancaster, United Kingdom
Volume Title:Scottish Journal of Geology
Source:Scottish Journal of Geology, 22( Part 1), p.107-126. Publisher: Scottish Academic Press, Edinburgh, United Kingdom. ISSN: 0036-9276
Publication Date:1986
Note:In English. 50 refs.; illus. incl. 4 tables, sketch map
Summary:Within the Moine outcrop, three types of 'anomalous' pelitic rocks form local, probably allochthonous successions: 1) sillimanite gneisses in Ardgour, Glen Dessarry and Glen Loy, each intimately involved with major intrusions; 2) kyanite schists in Glen Lui, Glen Urquhart and Strathspey, each associated with major faults or slides; 3) fault-bounded biotite-muscovite gneisses in Gleann Liath. The sillimanite gneisses are restites, carrying local cordierite, corundum, hypersthene, spinel, etc.; they are relatively rich in elements of refractory minerals and poor in those found in fusible minerals, and thus their present chemistry cannot reveal their stratigraphical affinities. The kyanite schists and biotite-muscovite gneisses, however, approximate to sediment compositions and have been compared with equivalent Lewisian, Moinian and Dalradian rocks, using discriminant analysis on 161 analyses from >50 localities. The Strathspey and Glen Lui kyanite schists are chemically closest to Dalradian kyanite schists, supporting the view that the 'Grampian Moines' may include Dalradian strata. The anomalous biotite muscovite gneisses are tentatively assigned to a separate tectonic unit, the 'Albynian', so far only identified near the Great Glen fault. [R.A.H.]
Subjects:Carbonate rocks; Chemical composition; Clastic rocks; Geochemistry; Limestone; Major elements; Mineral composition; Occurrence; Precambrian; Sedimentary rocks; Shale; Trace elements; Europe; Great Britain; Scotland; Scottish Highlands; United Kingdom; Western Europe; Gleann Liath; Glen Lui; Glen Urquhart; Moine Outcrop
Abstract Numbers:86M/4748
Record ID:1986062136
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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