Item talk:Q244396

From geokb

{

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Discerning crystal growth from diffusion profiles in zoned olivine by in situ Mg\u2013Fe isotopic analyses",
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       "value": "10.1016/j.gca.2013.06.008",
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     "name": "Geochimica et Cosmochimica Acta",
     "volumeNumber": "123",
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   "datePublished": "2013",
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   "abstract": "Mineral zoning is used in diffusion-based geospeedometry to determine magmatic timescales. Progress in this field has been hampered by the challenge to discern mineral zoning produced by diffusion from concentration gradients inherited from crystal growth. A zoned olivine phenocryst from Kilauea Iki lava lake (Hawaii) was selected for this study to evaluate the potential of Mg and Fe isotopes for distinguishing these two processes. Microdrilling of the phenocryst (\u223c300 \u03bcm drill holes) followed by MC-ICPMS analysis of the powders revealed negatively coupled Mg and Fe isotopic fractionations (\u03b426Mg from +0.1\u2030 to \u22120.2\u2030 and \u03b456Fe from \u22121.2\u2030 to \u22120.2\u2030 from core to rim), which can only be explained by Mg\u2013Fe exchange between melt and olivine. The data can be explained with ratios of diffusivities of Mg and Fe isotopes in olivine scaling as D2/D1 = (m1/m2)\u03b2 with \u03b2Mg \u223c0.16 and \u03b2Fe \u223c0.27. LA-MC-ICPMS and MC-SIMS Fe isotopic measurements are developed and are demonstrated to yield accurate \u03b456Fe measurements within precisions of \u223c0.2\u2030 (1 SD) at spatial resolutions of \u223c50 \u03bcm. \u03b456Fe and \u03b426Mg stay constant with Fo# in the rim (late-stage overgrowth), whereas in the core (original phenocryst) \u03b456Fe steeply trends toward lighter compositions and \u03b426Mg trends toward heavier compositions with higher Fo#. A plot of \u03b456Fe vs. Fo# immediately distinguishes growth-controlled from diffusion-controlled zoning in these two regions. The results are consistent with the idea that large isotopic fractionation accompanies chemical diffusion in crystals, whereas fractional crystallization induces little or no isotopic fractionation. The cooling timescale inferred from the chemical-isotope zoning profiles is consistent with the documented cooling history of the lava lake. In the absence of geologic context, in situ stable isotopic measurements may now be used to interpret the nature of mineral zoning. Stable isotope measurements by LA-MC-ICPMS and MC-SIMS can be used as standard petrologic tools to identify samples for diffusion-based geospeedometry.",
   "description": "20 p.",
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