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- W46985217 abstract "Ilmenite veins and segregations are characteristic of four polymict xenoliths from the Bultfontein and De Beers mines. The mineral chemical and textural features of the ilmenite are described as well as the relationships with associated phlogopite, rutile and sulphides. Two of the xenoliths are strongly deformed and the ilmenite occurs as veins along the foliation. Post-crystallisation deformation in the ilmenite is evident in one of these xenoliths while in the other, ilmenite emplacement clearly post-dates deformation. The ilmenite has high Cr 2 O 3 and MgO contents (+1.5 wt% and 14-15 wt% respectively) and is strongly zoned, with Cr O contents at times being more than 5 wt% on the edges of the veins. Rutile is likewise Cr 2 O 3 -rich (2-4 wt%) and is also concentrated along the margins of the ilmenite veins and segregations. Phlogopite related to the ilmenite veins have variable Cr 2 O 3 contents (0-2.7 wt%) and TiO 2 contents of between 1.5-4 wt%. Chromite is a rare accessory mineral. The ilmenite and associated phlogopite, rutile and sulphides in the polymict rocks are thought to result from emplacement of an H 2 O-TiO 2 -K 2 O fluid associated with an early phase of mantle brecciation which probably occurred immediately prior to the intrusion of the kimberlite. This precursor event may relate to a metasomatic or pegmatitic front preceeding the upward migrating kimberlitic magma. Much of the macrocrystic ilmenite commonly found in many kimberlites is perhaps related to similar mantle/kimberlite events." @default.
- W46985217 created "2016-06-24" @default.
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- W46985217 date "1984-01-01" @default.
- W46985217 modified "2023-10-17" @default.
- W46985217 title "Ilmenite in Polymict Xenoliths from the Bultfontein and De Beers Mines, South Africa" @default.
- W46985217 doi "https://doi.org/10.1016/b978-0-444-42274-3.50011-1" @default.
- W46985217 hasPublicationYear "1984" @default.
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