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Mineral-scale Sr isotope variation in plutonic rocks - a tool for unravelling the evolution of magma systems

Davidson, Jon P.; Font, Laura; Charlier, Bruce L. A. and Tepley, Frank J. (2008). Mineral-scale Sr isotope variation in plutonic rocks - a tool for unravelling the evolution of magma systems. Transactions: Earth Sciences, 97(4) pp. 357–367.

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Isotope ratios of elements such as Sr, Nd, Pb and Hf can be used as tracers of magmatic sources and processes. Analytical capabilities have evolved so that isotope ratios can now be analysed in situ, and isotopic tracers can therefore be used within single minerals to track the changing magmatic environment in which a given mineral grew. This contribution shows that Sr isotope ratios in feldspars that make up plutonic rocks will typically preserve initial isotopic variations, provided precise and accurate age corrections can be applied. Variations in initial isotope ratio can give a core-to-rim record of magmatic evolution and can be used to diagnose open system events such as contamination and magma recharge and mixing.

New single grain Sr isotope data are presented from the Dais Intrusion, Antarctica, which reflect an open system origin for the crystals. The crystal cargo appears to be aggregated and assembled during transport and emplacement. This model, as opposed to a magma body crystallising post emplacement, may be more applicable to plutonic rocks in general, and is testable using the in situ isotopic determination methods described here.

Item Type: Journal Item
ISSN: 0263-5933
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 11575
Depositing User: Bruce Charlier
Date Deposited: 02 Sep 2008 07:59
Last Modified: 04 Oct 2016 10:12
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