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Geological Magazine; January 2003; v. 140; no. 1; p. 25-30; DOI: 10.1017/S0016756802007100
© 2003 Cambridge University Press (CUP)
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Article

Heavy minerals solve structural and stratigraphic problems in Ordovician strata of the western Irish Caledonides

MARIA A. MANGE*, JOHN F. DEWEY{dagger} and DAVID T. WRIGHT{ddagger}

* Department of Geology, UC Davis, Davis CA 95616, USA
{dagger} Department of Geology, UC Davis, Davis CA 95616, USA; University College, Oxford, UK
{ddagger} Department of Geology, University of Leicester, UK

Heavy minerals in Ordovician successions in western Ireland record, in the Upper Arenig Sheeffry Formation, the erosion of an ophiolite/island arc complex. The appearance of staurolite and garnet at a basin-wide horizon in the Lower Llanvirn Upper Derrylea Formation signals the unroofing of the Dalradian metamorphic complex. Parts of the Ordovician sequence on Inishturk and in two small inliers are correlated with the standard sequence with unexpected results. The garnet-, sillimanite-, and staurolite-bearing Letter Formation correlates with the Upper Derrylea Formation and, on Inishturk, heavy minerals in south-younging turbidites reveal a sinistral ramp zone, that places the Sheeffry Formation structurally above and to the south of the younger Derrylea Formation.

Key Words: Dalradian • Grampian Orogeny • island arcs • accretionary prisms • heavy minerals • correlation


Related articles in Geological Magazine:

BRUNTON, C. H. C., COCKS, L. R. M. & LONG, S. L. (eds) 2001. Brachiopods Past and Present.: Systematics Association Special Volume 63. xiii + 441 pp. London: copublished by Taylor & Francis with The Systematics Association. Price £80.00 (hard covers). ISBN 0 748 40921 1.
Simon Conway Morris
Geological Magazine 2003 140: 232-233. [Extract] [Full Text]  





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