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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Angola (1)
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sulfides (4)
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Primary terms
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absolute age (22)
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Africa
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Angola (1)
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Central African Republic (1)
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Congo Craton (1)
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Nile River (1)
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Orange River (2)
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South Africa
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Free State South Africa (4)
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-
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Swaziland (1)
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Antarctica
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Arctic region
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Asia
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Far East
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Mongolia (1)
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Indian Peninsula
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Israel
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Siberia (4)
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Tyumen Russian Federation
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Uzbekistan
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Atlantic Ocean
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boron (1)
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carbon
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Cenozoic
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Deep Sea Drilling Project
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Alps
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Monastery kimberlite
Age of the Eastern Kaapvaal mantle: Re-Os isotope data for peridotite xenoliths from the Monastery kimberlite
Garnet megacrysts from the Group I Monastery kimberlite (field enclosed by ...
Cr 2 O 3 versus Mg# plot for 180 megacrysts from the Monastery kimberlite,...
Multiple compositional megacryst groups from the Uintjiesberg and Witberg kimberlites, South Africa
Variation in selected major elements in Lekkerfontein and Uintjiesberg garn...
Correlation of H with (a) Ti, and (b) K, in clinopyroxene from mantle-deriv...
Compositions of clinopyroxenes in peridotitic xenoliths from Udachnaya kimb...
Variation in selected major elements in Lekkerfontein and Uintjiesberg clin...
Six hypabyssal kimberlite textures. ( A ) Segregations of serpentine (srp) ...
Comparative analysis for water in olivines ( a ), orthopyroxenes ( b ), gar...
Comments on the paper “Megacryst suites from the Lekkerfontein and Uintjiesberg kimberlites, southern Africa: evidence for a non-cognate origin”
Representative polarized infrared spectra of natural and experimental olivi...
Water in Natural Mantle Minerals I: Pyroxenes
GEOCHEMISTRY OF MAGNESIAN ILMENITE MEGACRYSTS FROM SOUTHERN AFRICAN KIMBERLITES
Abstract Kimberlites are extraordinary natural phenomena, ascending through the Earth’s lithosphere, entraining xenoliths, to erupt at the surface within hours to days of their inception deep within the lithospheric mantle. With the realization that some Ar/Ar phlogopite grain core ages may be indicative of geological events, we have undertaken high spatial resolution Ar/Ar dating of phlogopites in xenoliths and megacrysts from Kimberley, Monastery and Letseng in southern Africa, and Malaita, in the Solomon Islands, to est whether other mantle phlogopite cores may yield meaningful ages. Modelling of Ar diffusive loss profiles from phlogopite grain boundaries to cores provides information on both the eruption age and the duration of outgassing within the kimberlite magma, and hence yields estimates on diatreme ascent rates. The ascent durations are very similar for all of the southern African pipes studied, yielding durations of 0.9–6.9 days, assuming an average kimberlite magma temperature of 1000 °C. These can be compared to estimates from phlogopite xenoliths from Siberian diamond-bearing kimberlites yielding ascent durations of 2–15 hours (assuming the same magma temperature).