Textural and chemical zoning in garnets related to mantle metasomatism and deformation processes |
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| Authors: | Hongfu Zhang M A Menzies Xinhua Zhou Fengxiang Lu |
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| Institution: | (1) Laboratory of Lithosphere Tectonic Evolution Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;(2) Department of Geology, Royal Holloway University of London, TW20 0EX Egham, Surrey, UK;(3) China University of Geosciences, 430074 Wuhan, China |
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| Abstract: | A few texturally-zoned garnets were found in a polymict peridotite (JJG1414) from the Cretaceous kimberlite, Kimberley, South
Africa. The systematic analyses of electron and ion microprobe as well as laser fluorination technique reveal the existencal
of marked elemental and oxygen isotopic zonation in these garnets, corresponding to the textural zonation. The rims are normally
enriched in Ca, Ti, Cr, LREE, Sr, Nb, and depleted in Mg, Al and18O. It is demonstrated that these garnets were infiltrated by melts/fluids, probably representing the disequilibrated products
of fluid-assisted mantle deformation. |
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| Keywords: | South African kimberlite polymict xenolith garnet zoning mantle metasomatism and deformation |
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