Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1001p&link_type=abstract
Lunar and Planetary Science, volume 27, page 1001
Other
1
Calcium-Aluminum-Rich Inclusions, Differential Thermal Analysis, Melilite, Nucleation, Petrology: Experimental
Scientific paper
Many Ca-Al-rich inclusions (CAIs) are believed to have formed from melts, probably from the melting of pre-existing solids. Experimental petrologists attempt to duplicate these conditions in the laboratory and determine the set of experimental parameters that best correspond to the observed textures and chemistry. Since textures are highly dependent on nucleation characteristics of the melt, it is of interest to determine the temperature of crystallization of phases under varying conditions. Typically, this has been done by quenching individual samples at intervals during the cooling sequence and examining the experimental charges to determine the phases present. Under dynamic conditions many phases, such as melilite and anorthite, do not crystallize reproducibly due to the stoicastic nature of crystallization. Differential Thermal Analysis (DTA) has been routinely used at temperatures below the range of crystallization of CAIs, and generally under isothermal condition, to determine melting points, phase transitions and solid state reactions. I am extending this method to higher temperatures and dynamic crystallization conditions. The use of High Temperature Differential Thermal Analysis (HT-DTA) provides a means of determining the exact temperature of crystallization of major phases, and examining the nucleation characteristics of a melt under varying conditions without the need for numerous quenched samples. HT-DTA is used here to study the effect of time at maximum temperature on the crystallization of melilite from a bulk composition representing a Type A/B1 CAI.
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