Latter-day origin of diamonds of eclogitic paragenesis

Details Latter-day origin of diamonds of eclogitic paragenesis Latter-day origin of diamonds of eclogitic paragenesis

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..623r&link_type=abstract

Nature (ISSN 0028-0836), vol. 322, Aug. 14, 1986, p. 623-626.

Physics

44

Diamonds, Eclogite, Geochemistry, Mineralogy, Planetary Evolution, Africa, Australia, Biotite, Peridotite

Scientific paper

Inclusions and host rock age estimations are reported from Premier kimberlite in southern Africa and the Argyle lamproite in northwestern Australia. Both formations feature diamonds of eclogitic paragenesis with inclusions which permitted radioactive dating by measurements of various Rb/Sr, Sr/Sr, Sm/Nd, and Nd/Nd isotopic ratios. The 1.58 Gyr age found for inclusions in the Argyle diamonds was about 450 Myr older than the host lamproite emplacement age and slightly less than the 1.8 Gyr since the stabilization of the surrounding Halls Creek mobile zone. The Premier diamond inclusions were, in contrast, of approximately the same age (about 1.2 Gyr) as the host kimberlite emplacement age. The proximity of the two diamond-formation ages and the disparity of the age relationships with the host material supports a model of two distinct diamond genesis processes which occurred in roughly the same epoch.

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