Notes on Rock-forming Minerals(26)Enstatite from a Garnet-Peridotite Inclusion in Kimberlite
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Garnet: A Rock-Forming Mineral Petrochronometer
Garnet could be the ultimate petrochronometer. Not only can you date it directly (with an accuracy and precision that may surprise some), but it is also a common rock-forming and porphyroblast-forming mineral, with wide ranging—yet thermodynamically well understood— solid solution that provides direct and quantitative petrologic context. While accessory phase petrochronology is based largely up...
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The key to the origin of carbonatite and kimberlite lies in the system CaOMg0-Si0 2 -C0 2 . Increase in pressure causes a carbonation reaction in the peridotite assemblage as follows: forsterite + clinopyroxene + C 0 2 ^ orthopyroxene + carbonate (Ca:Mg::70:30). This reaction passes through 15 kb-960°C with slope 45 b/°C and terminates at an invariant point near 25 kb-1200°C, where melting begi...
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Diamonds formed during the Proterozoic and Archaean and are in-homogenously distributed in the mantle below Archaean cratons. Kimberlite magmas usually form well within the diamond stability field and physically incorporate seemingly random amounts of diamonds during their ascent through the mantle. The diamond content of a kimberlite magma arriving at the earth’s surface is defined by ascent p...
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ژورنال
عنوان ژورنال: The Journal of the Geological Society of Japan
سال: 1963
ISSN: 0016-7630,1349-9963
DOI: 10.5575/geosoc.69.157