The Benfontein kimberlite sills: magmatic reactions and high intrusion temperatures. Article

McMahon, B, Haggerty, SE. (1984). The Benfontein kimberlite sills: magmatic reactions and high intrusion temperatures. . American Journal of Science, 284(8), 893-941. 10.2475/ajs.284.8.893

cited authors

  • McMahon, B; Haggerty, SE

abstract

  • Vertical gradations in mineralogy and oxide parageneses of the middle sill, together with the evidence of pre- and post-intrusion reactions, support the conclusion that the kimberlite sills at Benfontein, South Africa, were emplaced as xenolith-poor, phenocryst-rich carbonated peridotite magmas under T higher than those typical for kimberlite intrusions elsewhere. Release of the necessary heat for producing and maintaining reaction T probably involved consumption of graphite and/or diamond and/or methane. Redox re-equilibration of magmatic phases may have contributed significantly to the high intrusion T.-M.S.

authors

publication date

  • January 1, 1984

published in

Digital Object Identifier (DOI)

start page

  • 893

end page

  • 941

volume

  • 284

issue

  • 8