Features of metamict zircons based on their micrographs and the data of electron microprobe analysis.
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| Title: | Features of metamict zircons based on their micrographs and the data of electron microprobe analysis. |
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| Authors: | Votyakov, S.1, Zamyatin, D.1 zamyatin@igg.uran.ru, Shchapova, Yu.1, Porotnikov, A.1, Krasnobaev, A.1 |
| Source: | Doklady Earth Sciences. Jul2014, Vol. 457 Issue 1, p882-886. 5p. |
| Subjects: | Data analysis, Micrographics, Zircon, Metamorphic rocks, Crystal structure |
| Abstract: | A new quantitative approach on the basis of joint probability distribution (JPD) analysis of BSE- and CL-images is proposed for studies of the zoning of polygenic (polychronous) grains of zircon. It was shown for the example of zircon of the Mugodzhar metamorphic rocks (South Ural) that a series of zones might be distinguished in the grains of high chemical (structural) heterogeneity. Zones Ia and Ib belong to the fragments of crystalline and radiation-damaged zircon, respectively. Zone II corresponds to the primarily disordered areas (the 'genetically metamict' zones) of high concentrations of the impurities of Y, P, REE, U, Hf, etc. The Ia-Ic trend is related to the process of autoradiation metamictization. Based on the data on oxygen content, the declinations of zircon composition from the stoichiometry and the hydration effects were considered. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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