Other
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...234..189e&link_type=abstract
Science (ISSN 0036-8075), vol. 234, Oct. 10, 1986, p. 189-193.
Other
28
Geochemistry, Lightning, Liquid Metals, Mineralogy, Reduction (Chemistry), Silicates, Fusion (Melting), Glass, High Temperature, Impact Melts, Phase Diagrams, Solubility
Scientific paper
A glassy fulgurite, formed recently on a morainal ridge in southeastern Michigan, contains micron to centimeter-sized metallic globules rich in native silicon, which unmixed from a silica-rich liquid. Thermodynamic calculations indicate that temperatures in excess of 2000 K and reducing conditions approaching those of the SiO2-Si buffer were needed to form the coexisting metallic and silicate liquids. The phases produced are among the most highly reduced naturally occurring materials known. Some occurrences of other highly reduced minerals may also be due to lightning strike reduction. Extreme reduction and volatilization may also occur during high-temperature events such as lightning strikes in presolar nebulae and impacts of extraterrestrial bodies. As a result of scavenging of platinum-group elements by highly reduced metallic liquids, geochemical anomalies associated with the Cretaceous-Tertiary boundary may have a significant terrestrial component even if produced through bolide impact.
Essene Eric J.
Fisher Charles D.
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