Computer Science
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1715l&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, Aug. 1986, p. 1715-1726.
Computer Science
37
Chondrule, Crystallization, Melts (Crystal Growth), Meteoritic Composition, Pyroxenes, Inclusions, Olivine, Photomicrography, Transition Temperature
Scientific paper
Dynamic crystallization experiments in which heterogeneous nucleation is an important variable have been completed on four melts of chondrule composition. Compositions were chosen to best represent chondrules with porphyritic pyroxene and radial pyroxene textures. Experimental results show that heterogeneous nucleation is essential for the formation of porphyritic textures. Without preexisting nuclei, too much supercooling is established before crystallization is initiated and the textures are more likely to be dendritic or radial. In the near total absence of nuclei, radial textures can form at cooling rates as slow as 5 C/hr in this study. By varying the heterogeneous nucleation conditions and having a melt in which the appropriate phases are stable or metastable, analogs to most of the recognized chondrule textures can be produced in a single melt composition.
Lofgren Gary
Russell William J.
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