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Authigenic albite in the Pendleside Formation (Dinantian) of northern England

Published online by Cambridge University Press:  01 May 2009

P. Turner ,
J. R. Ashworth  and
F. A. Iskenderian
P. Turner
Affiliation:
Department of Geological Sciences, The University of Ashton, Birmingham B4 7ET, U.K.
J. R. Ashworth
Affiliation:
Department of Geological Sciences, The University of Ashton, Birmingham B4 7ET, U.K.
F. A. Iskenderian
Affiliation:
Department of Geological Sciences, The University of Ashton, Birmingham B4 7ET, U.K.
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Summary

Authigenic albite occurring as euhedral overgrowths up to 400 μm in size is a characteristic feature of the Pendleside Limestone in the Craven Basin of northern England. The albite is very pure, low-albite in keeping with other authigenic albites in carbonate rocks. The detrital cores of the albites are angular plagioclase grains of approximately An20 composition which are sometimes altered to kaolinite. The albite crystals with their detrital cores are frequently concentrated in discrete laminae, suggesting that the plagioclase cores may have been supplied by a basic volcanogenic source. This view is supported by geochemical studies of limestones which reveal significant correlation between K–Na, Na–Al and K–Al.

Interstitial alteration of detrital components, in particular the reaction intermediate plagioclase → kaolinite + albite, was primarily responsible for albite authigenesis. The initial products of this reaction probably included smectite which fixed Mg2+ in the decomposing volcanic grains. Subsequent alteration of the smectite resulted in the formation of small microdolomite inclusions which are commonly seen in the authigenic albites. An equilibrium model in terms of Na+/H4 ratios and H4SiO4 activity is proposed for the silicate assemblages in the Pendleside Formation.

Type
Articles
Information
Geological Magazine , Volume 119 , Issue 4 , July 1982 , pp. 395 - 404
Copyright
Copyright © Cambridge University Press 1982

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