Granny Smith diopside megacrysts from the kimberlites of the Kimberley area and Jagersfontein, South Africa

Details Granny Smith diopside megacrysts from the kimberlites of the Kimberley area and Jagersfontein, South Africa Granny Smith diopside megacrysts from the kimberlites of the Kimberley area and Jagersfontein, South Africa

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..381b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 2, pp.381-384

Physics

2

Scientific paper

Calcic diopside megacrysts, called Granny Smith nodules, in the Kimberley area and Jagersfontein kimberlites are sheared, commonly contain lenticles of ilmenite and intergrowths of phlogopite, and have a distinctive apple-green color. These diopsides have Ca /( Ca + Mg ) > 0.45, Mg /( Mg + Fe ) > 0.90, 0.2-0.4 wt% TiO 2 and 0.5-3 wt% Cr 2 O 3 . They have Na > ( Al + Cr ), in contrast to diopsides in peridotite xenoliths and those that form subcalcic discrete nodules, but in this respect are similar to diopsides in amphibole-bearing MARID nodules and mica-rich glimmerites. Granny Smith megacrysts are not cognate ( Kramers , 1979); their parental magmas (in an igneous or metasomatic sense) may have been parts of the spectrum between kimberlites and lamproites.

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