Evidence for crystals from the lower mantle: baddeleyite megacrysts of the Mbuji Mayi kimberlite

Details Evidence for crystals from the lower mantle: baddeleyite megacrysts of the Mbuji Mayi kimberlite Evidence for crystals from the lower mantle: baddeleyite megacrysts of the Mbuji Mayi kimberlite

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000e%26psl.179..219k&link_type=abstract

Earth and Planetary Science Letters, Volume 179, Issue 2, p. 219-225.

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Scientific paper

We report results of a transmission electron microscopy study on previously dated centimeter-sized baddeleyite xenocrysts (ZrO2) from the Mbuji Mayi kimberlite, DR Congo [Schärer et al., Chem. Geol. 143 (1997) 1-16]. Crystallographic analysis of their microstructures reveals that these megacrysts transformed to the present monoclinic state from a cubic parent phase, for which we infer a lower mantle origin because of its high temperature stability field. Our results substantiate ideas of solid material transfer across the 670 km mantle discontinuity and as such are in agreement with previous phase-petrologic investigations of tiny ferro-periclase inclusions in diamonds [Scott Smith et al., in: Kimberlites I: Kimberlites and Related Rocks, pp. 121-142 Harte and Harris, Miner. Mag. 58A (1994) 384-385 Kesson and Fitzgerald, Earth Planet. Sci. Lett. 111 (1991) 229-240 Joswig et al., Earth Planet. Sci. Lett. 173 (1999) 1-6] for which a lower mantle origin has also been proposed. In contrast to these inclusions, the baddeleyites further record chronological information and hence, potentially provide new insights into the history of mantle dynamics.

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