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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Sem Observations on Some Sand Fulgurites from Northern Australia
Kenneth Pye
ABSTRACT
Sand fulgurites fragments from a siliceous coastal dune field in North Queensland have been examined with a scanning electron microscope (SEM). The fulgurites show a number of morphological and textural features which can be related to the process of their formation when lightning strikes sandy sediments. The outer surfaces of the fulgurite tubes possess a rough surface texture due to numerous vesicles and partly fused adhering quartz grains, whereas the inner surface of the central lumen is typically much smoother and has a vitreous appearance. "Zip-like trails," "needles" or "threads" of silica, and clusters of iron-stained quartz silt particles have been observed on the walls of the lumen, but SEM analysis has provided no evidence that the fulgurites examined were formed by fusion f quartz sand around plant roots.
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