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Elements; August 2007; v. 3; no. 4; p. 253-259; DOI: 10.2113/gselements.3.4.253
© 2007 Mineralogical Society of America
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Isotopic Microsampling of Magmatic Rocks

Jon P. Davidson1, Daniel J. Morgan2 and Bruce L.A. Charlier3

1 Department of Earth Sciences
Durham University, Durham DH1 3LE, UK
E-mail: j.p.Davidson{at}durham.ac.uk
2 Institute of Geophysics and Tectonics
School of Earth and Environment, Earth Science Building
University of Leeds, Leeds LS2 9JT, UK
3 Department of Earth Sciences, The Open University
Walton Hall, Milton Keynes MK7 6AA, UK

Radiogenic isotope ratios can be used as a kind of petrogenetic "DNA" to identify the source components of magmas. Technical advances allowing us to measure isotopic compositions at the sub-crystal scale have led to the realisation that many magmatic rocks are isotopically heterogeneous. Crystals traditionally regarded as phenocrysts grown from the host magma have now been shown to be wholly or partly out of isotopic equilibrium with the glass or groundmass in which they are contained. Many of these crystals are likely to be recycled from earlier cumulates. Combining these fingerprinting techniques with the other approaches described in this issue offers an unprecedented opportunity to understand the processes and timescales through which magmas are assembled, differentiated and delivered to sites of eruption or emplacement.

KEYWORDS: magmatic processes, isotopes, differentiation, cumulate recycling, mass spectrometer




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