Hostname: page-component-7479d7b7d-fwgfc Total loading time: 0 Render date: 2024-07-13T01:10:36.086Z Has data issue: false hasContentIssue false
  • English
  • Français

Epidotic calc-silicates of Arnipol Type—a widely distributed minor sedimentary facies of the Moinian assemblage, Scotland

Published online by Cambridge University Press:  01 May 2009

J. A. Winchester
J. A. Winchester
Affiliation:
Department of Geological SciencesScience LaboratoriesSouth RoadDurham, England
Get access Rights & Permissions [Opens in a new window]

Summary

In the Moinian rocks of Scotland, epidote-bearing calc-silicates, distinct from the commoner garnet-zoisite-bearing calc-silicates, occur at several widely scattered locations. The major element geochemistry of the two types of calc-silicate is very similar, and their somewhat different petrology and trace element geochemistry may be explained by the preservation of grains of detrital epidote and heavy minerals in the epidotic calc-silicates. These grains were concentrated in the original sediment and remained stable under greenschist and epidote-amphibolite metamorphic facies conditions. While the garnet-zoisite bearing calc-silicates may be derived from calcareous marls, the epidotic calc-silicate bands are probably derived from epidotic grits similar to those recorded in the Torridonian.

Type
Articles
Information
Geological Magazine , Volume 112 , Issue 2 , March 1975 , pp. 175 - 181
Copyright
Copyright © Cambridge University Press 1975

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Blyth, F. G. H. & Lambert, R. St J. 1969. Chemical data from the Malvernian of the Malvern Hills, Herefordshire. Q. Jl geol. Soc. Lond. 125, 534–55.CrossRefGoogle Scholar
Butler, B. C. M. 1962. Biotite- and Sphene-rich rocks in the Moine Series of Ardnamurchan, Argyllshire. Geol. Mag. 99, 173–82.Google Scholar
Butler, B. C. M. 1965. A chemical study of some rocks of the Moine Series of Scotland. Q. Jl geol. Soc. Lond. 121, 163–208.CrossRefGoogle Scholar
Deer, W. A., Howie, R. A. & Zussman, J. 1962. Rock Forming Minerals. Longmans. Green & Co. Ltd., London.Google Scholar
Hurlbut, C. S. 1969. Gem Zoisite from Tanzania. Am. Miner. 54, 702–9.Google Scholar
MacGregor, A. G. 1948. Resemblances between Moine and “Sub-Moine” metamorphic sediments in the Western Highlands of Scotland. Geol. Mag. 85, 265–75.Google Scholar
Matthews, D. W. & Cheeney, R. F. 1968. The metamorphic evolution of the Moine Nappe in Skye. Scott. J. Geol. 4, 20–30.Google Scholar
Nash, W. P. 1972(a). Apatite chemistry and phosphorus fugacity in a differentiated igneous intrusion. Am. Miner. 57, 877–86.Google Scholar
Nash, W. P. 1972(b). Apatite-calcite equilibria in carbonatites: chemistry of apatite from Iron Hill, Colorado. Geochim. Cosmochim. Acta 30, 1313–19.Google Scholar
Selley, R. C. 1966. Petrography of the Torridonian rocks of Raasay and Scalpay, Inverness-shire. Proc. Geol. Ass. 77, 293–309.Google Scholar
Stewart, A. D. 1962. On the Torridonian sediments of Colonsay and their relationship to the main outcrop in north-west Scotland. Lpool Mnchr geol. J. 3, 121–56.CrossRefGoogle Scholar
Stewart, A. D. & Hackmann, B. D. 1973. Precambrian sediments of Western Islay. Scott. J. Geol. 9, 185–201.Google Scholar
Sutton, J. & Watson, J. V. 1964. Some aspects of Torridonian stratigraphy in Skye. Proc. Geol. Ass. 75, 251–89.Google Scholar
Tanner, P. W. G. 1970. The Sgurr Beag Slide – a major tectonic break within the Moinian of the Western Highlands of Scotland. Q. Jl geol. Soc. Lond. 126, 435–64.Google Scholar
Turekian, K. K. & Wedepohl, K. H. 1961. Distribution of the elements in some major units of the Earth's crust. Bull geol. Soc. Am. 72, 175–92.Google Scholar
Winchester, J. A. 1972. The petrology of Moinian calc-silicate gneisses from Fannich Forest, and their significance as indicators of metamorphic grade. J. Petrology 13, 405–24.Google Scholar
Winchester, J. A. 1974. The control of the whole-rock content of CaO and Al2O3 on the occurrence of the aluminium silicate polymorphs in amphibolite-facies pelites. Geol. Mag. 111, 205–211.Google Scholar