Email this article Geochemistry of garnet megacrysts from the Mir kimberlite pipe (Yakutia) and the nature of prothokimberlite melt
- Authors: Agashev A.M.1
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Affiliations:
- Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
- Issue: Vol 486, No 5 (2019)
- Pages: 583-587
- Section: Geochemistry
- URL: https://journals.eco-vector.com/0869-5652/article/view/14490
- DOI: https://doi.org/10.31857/S0869-56524865583-587
- ID: 14490
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Abstract
The paper presents the results of major and trace elements composition study of garnet megacrysts from Mir kimberlite pipe. On the major elements composition those garnets classified as low Cr and high Ti pyropes. Concentrations of TiO2 show a negative correlation with MgO и Cr2O3 contents in megacrysts composition. Fractional crystallization modeling indicates that the most appropriate melt to reproduce the garnet trace elements signatures is the melt of picritic composition. Composition of garnets crystallized from kimberlite melt do not correspond to observed natural garnets composition. Kimberlites contain less of Ti, Zr, Y and heavy REE (rare earth elements) but more of very incompatible elements such as light REE, Th, U, Nb, Ba then the model melt composition that necessary for garnet crystallization.
Keywords
About the authors
A. M. Agashev
Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Author for correspondence.
Email: agashev@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090
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