학술논문
Lightning-induced beads, ‘fulguroids’, associated with kimberlite eruptions in the Kalahari, Botswana.
Document Type
Article
Author
Source
Subject
*GLASS beads
*KIMBERLITE
*GEOMORPHOLOGY
*GEOCHEMISTRY
*KIMBERLITE eruptions
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Language
ISSN
1437-3254
Abstract
Glassy beads were found in the sand cover associated with known and suspected kimberlites on the Kalahari plateau, Botswana. Morphology and chemistry were examined by ESEM and EDAX. The polymetallic and quartzose “beads”, here described for the first time and termed fulguroids, formed at very high temperatures, well in excess of those reached by the kimberlites. They solidified in free fall. We propose that they were melted in the atmosphere by lightning strikes on Kalahari overburden entrained when the kimberlites erupted. [ABSTRACT FROM AUTHOR]