...Alan D. Edgar; Makoto Arima; Diane K. Baldwin; David R. Bell; Simon R. Shee; E. Michael W. Skinner; Edward C. Walker Abstract Phase relations in a SiO 2 -poor aphanitic Group I kimberlite from the Wesselton mine, South Africa, were determined at 10-40 kbar and 1000-1525 °C. Experiments were done...

... contents. The solvents used were a natural kimberlite from Wesselton Mine, South Africa and a synthetic H 2 O-free and CO 2 -rich kimberlite. Experiments with the Wesselton kimberlite were carried out at 1400 and 1500 °C under 1.0 GPa and those with the synthetic kimberlite were conducted at 1500 °C under...

...Figure 1. Location of Wesselton Mine, other major kimberlite occurrences around Kimberley, the Wesselton sill complex, and the Benfontein sill. Note the northwest to southeast alignment of the five major diamondiferous kimberlite pipes. ...

...Alan D. Edgar; Heather E. Charbonneau Abstract Phase relations in a SiO 2 -poor, CaO-rich aphanitic kimberlite from the Wesselton mine, Kimberley, South Africa, were determined in a multianvil apparatus at 5.0–10.0 GPa and 1300–1670°C. The experiments were done with the 6.20 wt% H 2 O and 4.77 wt...

... also assigned to the Goedgenoeg Formation, which underlies the Makwassie Formation in Wesselton Mine at Kimberley, gave an age of 2781 ± 5 Ma. A 30 Ma period of Goedgenoeg volcanism is considered to be unlikely. The older sample may rather be a time-correlate of a stratigraphically lower unit...

... agents used include an aphanitic kimberlite from Wesselton Mine, South Africa, and a lamproite from Mount North, West Kimberley, Australia. With increasing run duration, diamond morphology changed from a sharp octahedron through combinations of octahedron and tetrahexahedroidal forms to spherical...

... , p. 909 , 1991 . [27] L. A. Tompkins and S. E. Haggerty , Groundmass oxide minerals in the Koidu kimberlite dikes, Sierra Leone, West Africa , Contr. Miner. Petrol ., vol. 91 , p. 245 , 1985 . [28] S. R. Shee , The petrogenesis of the Wesselton Mine kimberlites...

... and several transitional zones. Wesselton mine, South Africa. (E–F) Perovskite with oscillatory pattern of zonation. Benfontein mine, South Africa. ...

...Andrew J. Berry; Gregory M. Yaxley; Brendan J. Hanger; Alan B. Woodland; Martin D. de Jonge; Daryl L. Howard; David Paterson; Vadim S. Kamenetsky Abstract The oxidation state of Fe in garnets in a garnet peridotite xenolith from the Wesselton kimberlite (South Africa) was quantitatively mapped...

... (BD1959, Wesselton; P  = 39 kbar, T  = 940°C); ( b ) exsolution lamellae of garnet in an orthopyroxene megacryst (BD1951, Bultfontein, Kimberley; P  = 37 kbar, T  = 904°C); and ( c ) necklace texture of garnet around orthopyroxene in a peridotite xenolith (BD2015/3a, Frank Smith mine; P  = 35 kbar...

... crystallize near the liquidus at 5.5–6.0 GPa and in the presence of twice as much volatiles. Edgar et al. [ 28 , 29 ] studied natural aphanitic kimberlite from the Wesselton mine (Africa). This kimberlite contains much CaO (~18 wt.%); thus, it crystallizes with the participation of clinopyroxene. It also...

... , E.M.W. & Walker , E.C. ( 1988 ): High-pressure – high-temperature melting experiments on a SiO 2 -poor aphanitic kimberlite from the Wesselton mine, Kimberley, South Africa . Am. Mineral . 73 , 524 – 533 . Edgar , A.D. & Charbonneau , H.E. ( 1993 ): Melting...