Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..305d&link_type=abstract
Lunar and Planetary Science, volume 27, page 305
Computer Science
3
Liquid Immiscibility, Moldabites, Soret Diffusion, Tektites: Muong Nong, Tektites
Scientific paper
Compositional heterogeneities within individual tektites on scales >100 microns have been described and attributed to incomplete mixing of diverse lithologies in the target during impact melting. During the impact event, these melts were heated (3000 degrees C; far above their liquidus temperatures (about 1350degrees C; and then cooled rapidly to form glass. Some tektites were transported above the Earth's atmosphere and underwent a second heating episode when they re-entered the atmosphere at hypersonic velocity. This second heating episode generated flanges. If, as implicitly assumed by tektite investigators, mixing/dissolution processes dominated during these heating events, why are compositional heterogeneities better developed in the flanges, which are products of two intense heating events, than in the core of the same tektite that underwent only one heating event? Since chemical diffusion during the second heating event should have decreased the size and magnitude of the compositional heterogeneities, an unmixing/exsolution process seems to be more compatible with the observations. The current study has found that trends of element distribution exhibited by schliere within splash-form tektites are nearly identical to those exhibited by millimeter-scale layers in Muong Nong-type tektites. Consequently, it is the view of this abstract that: (a) schlieren and layers were produced by a single, chemical exsolution process; and (b) the differing length-scales of the compositional heterogeneities reflect different temperature-time histories of the samples.
Delano John W.
Hanson Brooks
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