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    Multistage Mantle Metasomatism during the Generation of Kimberlite Melts: Evidence from Mantle Xenoliths and Megacrysts of the Grib Kimberlite, Arkhangelsk, Russia
    Petrology (2021)
    А. В. Каргин
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    Keywords:
    Peridotite
    Metasomatism
    Xenolith
    Phlogopite
    Ultramafic rock
    Primitive mantle
    Topics:
    Geological and Geochemical Analysis
    High-pressure geophysics and materials
    earthquake and tectonic studies
    The geology and mineralogy of the Anuri kimberlite, Nunavut, Canada
    Lithos (2004)
    K.M. MasunBuddy DoyleS. BallSamuel Walker
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    Major- and Trace-Element Compositions of Indicator Minerals that Occur as Macro- and Megacrysts, and of Xenoliths, from Kimberlites in Northeastern Angola
    Minerals (2012)
    Sandra E. Robles-CruzJoan Carles Melgarejo i DraperSalvador GalíM. Escayola
    In this study, we compare the major- and trace-element compositions of olivine, garnet, and clinopyroxene that occur as single crystals (142 grains), with those derived from xenoliths (51 samples) from six kimberlites in the Lucapa area, northeastern Angola: Tchiuzo, Anomaly 116, Catoca, Alto Cuilo-4, Alto Cuilo-63 and Cucumbi-79. The samples were analyzed using electron probe microanalysis (EPMA) and laser-ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). The results suggest different paragenetic associations for these kimberlites in the Lucapa area. Compositional overlap in some of the macrocryst and mantle xenolith samples indicates a xenocrystic origin for some of those macrocrysts. The presence of mantle xenocrysts suggests the possibility of finding diamond. Geothermobarometric calculations were carried out using EPMA data from xenoliths by applying the program PTEXL.XLT. Additional well calibrated single-clinopyroxene thermobarometric calculations were also applied. Results indicate the underlying mantle experienced different equilibration conditions. Subsequent metasomatic enrichment events also support a hypothesis of different sources for the kimberlites. These findings contribute to a better understanding of the petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration.
    Xenolith
    Metasomatism
    Trace element
    Primitive mantle
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    Metasomatism in mantle xenoliths from the Letlhakane kimberlites: estimation of element fluxes
    Contributions to Mineralogy and Petrology (2001)
    E. van AchterberghWilliam L. GriffinJohann Stiefenhofer
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    Phlogopite-rich and phlogopite-poor kimberlite intrusions within the Du Toitspan kimberlite pipe, South Africa: Petrogenetic relationships and localised source heterogeneity
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    Contributions to Mineralogy and Petrology (1978)
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    Xenolith
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    The geology and mineralogy of the Anuri kimberlite, Nunavut, Canada
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    Lapilli
    Diatreme
    Country rock
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    Geochimica et Cosmochimica Acta (1996)
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    Petrology (2016)
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    Xenoliths of phlogopite-bearing rocks in kimberlites of Yakutia
    International Geology Review (1980)
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