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The ordovician (caradoc) volcanic rocks of montgomery, Powys, N. Wales

✍ Scribed by R. J. Dixon

Book ID: 102846269
Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 594 KB
Volume: 23
Category: Article
ISSN: 0072-1050
DOI: 10.1002/gj.3350230204

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✦ Synopsis

The Ordovician (Caradoc, Soudleyan) rocks of Montgomery, Powys are shales interbedded with locally conglomeratic volcanjclastic sediments composed of andesitic detritus. New formal lithostratigaphic units are proposed: Montgomery Volcanic Group comprising in ascending order: Castle Hill Shale Formation, Castle Hill Conglomerate Formation and Quarry Sandstone and Shale Formation. The volcaniclastic strata are reinterpreted as deposits of a submarine volcaniclastic fan system sourced by contemporaneous andesitic island volcanism. The observed diagenetic sequence is typical of marine volcanic sandstones and was dominated by hydration reactions related to the degradation of abundant unstable volcanic detritus. Diagenesis has resulted in the virtual destruction of original porosity in the volcaniclastic rocks.

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