Abstract
IN her paper on “The Eastern End of the Newry Igneous Complex”, which was read before the Geological Society on February 7, Miss Doris L. Reynolds made a contribution to petrogenesis of outstanding importance. The rocks described are types common to many erogenic regions, and include peridotite, biotite-pyroxenite, augite- and hyper-sthene-monzonite, augite-biotite-diorite and grano-diorite. These are convincingly shown to be derivatives, not from basaltic or granitic magmas (gabbro and granite being absent from the area), but from three primary sources, two of which have hitherto remained unsuspected. The three parental materials now recognised are (a) ultrabasic magmas rich in potash; (b) Silurian sediments which became fused by contact with the latter; (c) a magma represented almost entirely by plagioclase. The conclusions reached are supported by a suite of detailed analyses made by Mr. L. Theobald and Prof. H. F. Harwood.
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Petrogenesis of the Newry Igneous Complex. Nature 133, 467–468 (1934). https://doi.org/10.1038/133467b0
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DOI: https://doi.org/10.1038/133467b0