Petrography and low grade metamorphism of an Ordovician pelite from the Fishguard district, Wales, 1:50k sheet 210

Kemp, S.J.; Merriman, R.J.

NORA

Petrography and low grade metamorphism of an Ordovician pelite from the Fishguard district, Wales, 1:50k sheet 210

Kemp, S.J. ORCID: https://orcid.org/0000-0002-4604-0927; Merriman, R.J.. 2006 Petrography and low grade metamorphism of an Ordovician pelite from the Fishguard district, Wales, 1:50k sheet 210. Nottingham, UK, British Geological Survey, 16pp. (IR/06/038) (Unpublished)

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Abstract

This report describes the results of a petrographic and X-ray diffraction study of a single pelite sample collected as part of the geological survey of the Fishguard, Wales 1:50k sheet 210. A Kubler Index of 0.41 from XRD analysis indicates that the pelite has just reached the low anchizone grade of low grade metamorphism. Backscattered scanning electron microscopy of a polished thin section of the pelite reveals evidence of sedimentary lamination, a penetrative cleavage and later Fe-oxide veining. Such findings are in keeping with previous illite crystallinity surveys of the Welsh Basin.

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