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Characterisation of inhomogeneous inclusions in Darwin glass using ion beam analysis

Bailey, MJ, Howard, KT, Kirkby, KJ and Jeynes, C (2009) Characterisation of inhomogeneous inclusions in Darwin glass using ion beam analysis NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 267 (12-13). pp. 2219-2224.

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Abstract

Darwin glass is an impact glass resulting from the melting of local rocks during the meteorite impact that formed the 1.2 km diameter Darwin Crater in western Tasmania. These glass samples have small spheroidal inclusions, typically a few tens of microns in diameter, that are of great interest to the geologists. We have analysed one such inclusion in detail with proton microbeam ion beam analysis (IBA). A highly heterogeneous composition is observed, both laterally and in depth, by using self-consistent fitting of photon emission and particle backscattering spectra. With various proton energies near 2 MeV we excite the C-12(p,p)C-12 resonance at 1734 keV at various depths, and thus we can probe both the C concentration, and also the energy straggling of the proton beam as a function of depth which gives information on the sample structure. This inclusion has an average composition of (C, O, Si) = (28, 56, 16) mol% with S, K, Ca, Ti and Fe as minor elements and Cr, Mn, Ni, Cu, Zn and Br as trace elements. This composition includes, at specific points, an elemental depth profile and a density variation with depth consistent with discrete quartz crystals a few microns in size. (c) 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Authors :
NameEmailORCID
Bailey, MJUNSPECIFIEDUNSPECIFIED
Howard, KTUNSPECIFIEDUNSPECIFIED
Kirkby, KJUNSPECIFIEDUNSPECIFIED
Jeynes, CUNSPECIFIEDUNSPECIFIED
Date : 15 June 2009
Identification Number : 10.1016/j.nimb.2009.03.013
Uncontrolled Keywords : PIXE, RBS, EBS, Impact glass, Simulated annealing, 3D analysis, Silica, PROTON ELASTIC-SCATTERING, CROSS-SECTION, SIMULTANEOUS PIXE, BACKSCATTERING, IBA, SOFTWARE, CARBON, MULTILAYERS, DATAFURNACE, ROUGHNESS
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 14:38
Last Modified : 31 Oct 2017 14:38
URI: http://epubs.surrey.ac.uk/id/eprint/202006

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