Sector Zoning of Minor and Trace Elements in Synthetic Pyroxenes

Details Sector Zoning of Minor and Trace Elements in Synthetic Pyroxenes Sector Zoning of Minor and Trace Elements in Synthetic Pyroxenes

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1159s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1159

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Enstatite, Growth Mechanisms, Minor Elements, Partition Coefficients, Sector Zoning

Scientific paper

Enstatite (En80 Fs19 Wo1) crystals grown from hypersthene normative volatile-free basaltic melts under iron-wstite fugacity conditions contain dramatic sector zoning of minor (Al, Cr, Ti) elements and trace elements (Yb, other REE under investigation). Enstatite crystals are synthesized at constant furnace temperature a couples of degrees below the liquidus of 1210 degrees C, for a duration of 1 to 2 days, resulting in crystals with dimensions of 50 x 100 x 500-1000 m. The mineral/melt partition coefficients determined for each of the sectors can vary from one another by more than a factor of three. Sector development appears to be kinetically and crystallographically controlled. The largest concentration differences occur between the fastest and slowest growing sectors. Growth of these pyroxenes is fastest parallel to the c-axis, therefore in the case of Al, the {001} and {011} sectors are the most depleted and the prism sectors are most enriched, with the {010} sectors containing the most Al. To accurately determine a single equilibrium partition coefficient, one could algebraically average the partition coefficients on a sector volume percentage basis. However, sector differences between the prism sectors are minor and the prism sectors comprise the largest volume, such that use of partition coefficients determined from the prism sectors is perhaps appropriate for most modeling.

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