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LA-ICP-MS Rb-Sr dating of LCT rare-element pegmatites and associated rocks of Leinster, Ireland

Conference paper
Authors R. Barros
J. F. Menuge
Thomas Zack
Published in 14th SGA Biennial Meeting on Mineral Resources to Discover. 993-996
ISBN 978-2-9816898-0-1
Publication year 2017
Published at Department of Earth Sciences
Language en
Keywords LITHIUM PEGMATITES; SOUTHEAST IRELAND; SE IRELAND; GRANITE
Subject categories Geology

Abstract

High technology metals such as lithium and tantalum are commonly hosted in pegmatites, leading to renewed interest in understanding their origin. Obtaining accurate and precise results from pegmatites can be challenging. We have applied a newly developed laser ablation Rb-Sr dating method using reaction gases in a quadrupole ICP-MS to spodumene pegmatites and country rocks, late Caledonian granodiorite and Ordovician schist, in southeast Ireland. Rb-Sr isochron ages and initial Sr-87/Sr-86 ratios obtained are: around 413 Ma and 0.7109 +/- 49 to 0.8348 +/- 82 for lithium pegmatites; around 413 Ma and 0.7054 +/- 50 to 0.7102 +/- 28 for barren pegmatites; 420.6 +/- 8.4 Ma and 0.7068 +/- 28 for granodiorite; 406.5 +/- 5.8 and 0.7160 +/- 58 for schist. The method is sufficiently accurate and precise to date pegmatites. Ages obtained are consistent with the emplacement age of the Leinster Granite. Age constraints from schist within a pegmatite exomorphic halo are shown to be a good tool to determine pegmatite age. Highly variable initial Sr-87/Sr-86 ratios in spodumene pegmatites emplaced near schists show evidence for country rock contamination.

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