Preliminary UVLAMP determinations of argon partition coefficients for olivine and clinopyroxene grown from silicate melts.

Brooker, Richard A, Wartho, J.-A. , Carroll, Michael R, Kelley, Simon P and Draper, David S (1998) Preliminary UVLAMP determinations of argon partition coefficients for olivine and clinopyroxene grown from silicate melts. Chemical Geology, 147 (1-2). pp. 185-200. DOI 10.1016/S0009-2541(97)00181-2.

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Abstract

An ultra-violet laser ablation microprobe (UVLAMP) has been applied for the first time to investigate argon partition coefficients for olivines and clinopyroxenes grown from silicate melts at 1 bar argon pressure. These preliminary measurements yield crystal/melt partition coefficients ranging from 0.138 (±0.01) to 0.013 (±0.003) for olivine and 0.589 (±0.003) to 0.0016 (±0.0005) for clinopyroxene. The higher values may indicate sub-microscopic melt inclusions, or some other heterogeneous distributions of `non-equilibrium' argon in the crystals. The lower values are probably more representative of true partition coefficients and fall at least an order of magnitude below the previously reported experimental data. The possibility of anomalous, high argon contents for crystals in previous studies is discussed in terms of surface adsorption, `trapped' argon and early partial melting.

Document Type: Article
Keywords: Argon; Olivine; Clinopyroxene; Partitioning; Ultra-violet laser ablation microprobe
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0009-2541(97)00181-2
ISSN: 0009-2541
Date Deposited: 24 Nov 2015 10:07
Last Modified: 24 Nov 2015 10:07
URI: http://oceanrep.geomar.de/id/eprint/30287

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