Measurements of Silica Excess in Plagioclase in Chondrules from Primitive Carbonaceous Chondrites: Implications for 26Al-26Mg Systematics

Chaumard N. * Hertwig A. T. Kita N. T. Tenner T. J. Kimura M.

80th Annual Meeting of the Meteoritical Society 2017 [#6309]

abstract (PDF)

“Chondrules in 3.05–3.1 CCs contain plagioclases that retained silica excess, so that they are suitable for 26Al-26Mg chronology. Moreover, the preservation of silica excess might be more sensitive to secondary processes than Mg diffusion. ”