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Geological Society, London, Special Publications; 1979; v. 8; p. 717-722;
DOI: 10.1144/GSL.SP.1979.008.01.87
© 1979 Geological Society of London

8. Plutonism

The Newry igneous complex, County Down

I. G. Meighan & J. C. Neeson

Department of Geology, The Queen’s University of Belfast, Belfast BT7 1NN, N Ireland

New field and petrographic observations indicate that the ultramafic rocks and closely associated meladiorites at the northeast end of the complex are principally clinopyroxene-biotite-apatite (±plagioclase) cumulates from intermediate magmas. The meladiorites grade into more evolved oversaturated dioritic-monzonitic rocks, many of which may also be accumulative, and consequently the main intermediate and ultramafic body is thought to be part of a layered intrusion. New geochemical data for major and trace elements (including R.E.E.) and initial 87Sr/86Sr ratios show compositional similarities between some of the intermediate rocks and the younger granodiorites. The granodiorites are areally most abundant and probably constitute three contiguous plutons formed mainly by crystal fractionation at depth in intermediate magmas of Upper Mantle origin.





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S. P. Todd
Taking the roof off a suture zone: basin setting and provenance of conglomerates in the ORS Dingle Basin of SW Ireland
Geological Society, London, Special Publications, 2000; 180: 185 - 222.
[Abstract] [PDF]