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Nucleation and growth rates of pyroxene, plagioclase, and Fe-Ti oxides in basalt under atmospheric conditions

University of Karlsruhe, Institute for Mineralogy and Geochemistry, D-76128 Karlsruhe, Germany + Research Center Karlsruhe, Institute for Technical Chemistry, Water and Geotechnology (ITC-WGT), D-76021 Karlsruhe, Germany

E-mail: burkhard{at}itc-wgt.fzk.de

The crystal size distribution theory (CSD) is used to derive nucleation and growth rates (J, G) of pyroxene, plagioclase and Fe-Ti oxides in basalt glass during heat treatment under atmospheric conditions. The glass was sampled from active Pu'u O'o, Kilauea, Hawaii, by hammer-dipping and subsequent quenching. Temperature (T) and time (t) dependent heat treatment of the glass above temperatures of maximum nucleation (J) and growth (G), about 930 °C, allows one to derive the activation energy of J and G. J and G are linear with t on a logarithmic scale. The results are applied to estimate the crystallization temperature of cooling lava. Basalt textures defined by the order of crystallization, are explained with respect to thermal history based on the temperature-time relation between J and G.

Key-words: nucleation rate, growth rate, kinetics of crystallization, crystal size distribution theory, pyroxene, plagioclase, Kilauea (Hawaii).

This article has been cited by other articles:

				A. Orlando, M. D'Orazio, P. Armienti, and D. Borrini Experimental determination of plagioclase and clinopyroxene crystal growth rates in an anhydrous trachybasalt from Mt Etna (Italy) European Journal of Mineralogy, August 1, 2008; 20(4): 653 - 664. [Abstract] [Full Text] [PDF]