Columnar, branching and curbed feldspar growth in the St Michael's Mount Granite, Cornwall

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Authors:Jackson, G. E. A.; Power, G. M.
Author Affiliations:Primary:
University of Portsmouth, Department of Geology, Hampshire, United Kingdom
Volume Title:Proceedings of the Ussher Society
Source:Proceedings of the Ussher Society, Vol.8 (Part 4), p.363-367. Publisher: Ussher Society, Bristol, United Kingdom. ISSN: 0566-3954
Publication Date:1995
Note:In English. 18 refs.; illus., incl. block diag., geol. sketch map
Summary:In this area a marginal biotite granite is succeeded by a tourmaline muscovite one and then by a central porphyritic granite. A banded granite zone with comb-layering occurs near the outer edge of the tourmaline-muscovite granite. Some of the main features of the banded zone are described, the banding representing a frozen-in record of advancing in situ crystallization fronts in a solidifying magma. The variations in mineralogy and grain size may be explained largely in terms of kinetic controls on the crystallization of an undercooled peraluminous silicic magma. [R.E.S.]
Subjects:Alkali feldspar; Banded materials; Crystallization; Feldspar group; Framework silicates; Granites; Greisenization; Igneous rocks; K-feldspar; Metal ores; Metals; Metasomatism; Plutonic rocks; Silicates; Textures; Tin ores; Tungsten; Cornwall England; England; Europe; Great Britain; United Kingdom; Western Europe; Saint Michaels Mount Granite
Abstract Numbers:96M/2237
Record ID:1997058591
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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