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- W1980584620 abstract "40Ar/39Ar analyses have been made on phlogopite-bearing peridotite nodules from Bultfontein and phlogopite nodules from Du Toitspan, Kimberley area, South Africa. Neither definite plateau nor isochron age could be obtained due to the occurrence of an excess40Ar in phlogopite. However, the extrusion age of a phlogopite nodule from Du Toitspan has been estimated to be about 86 m.y. from the combination of the youngest40Ar/39Ar age in the intermediate temperature fraction with Rb/Sr age data reported for this area. Excess40Ar correlates with K-derived39Ar in some phlogopites suggesting that it is trapped in K- or K-similar sites and has been incorporated during phlogopite formation. The occurrence of large amounts of excess40Ar in phlogopite suggests that it was not formed at a shallow depth." @default.
- W1980584620 created "2016-06-24" @default.
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- W1980584620 date "1978-06-01" @default.
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- W1980584620 title "40Ar/39Ar analyses of phlogopite nodules and phlogopite-bearing peridotites in South African kimberlites" @default.
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- W1980584620 doi "https://doi.org/10.1016/0012-821x(78)90081-x" @default.
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