The occurrence of iron silicides in a fulgurite: Implications for fulgurite genesis

被引：0
作者：
Stefano C.J. [1 ,4 ]
Hackney S.A. [2 ]
Kampf A.R. [3 ]
机构：
[1] A.E. Seaman Mineral Museum, Michigan Technological University, Houghton, MI
[2] Materials Science and Engineering, Michigan Technological University, Houghton, 49931, MI
[3] Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, 90007, CA
[4] Mineralogical Record, Tucson, AZ
来源：
Canadian Mineralogist | 2019年 / 57卷 / 06期
关键词：
Fulgurite; Lightning; Silicides;
D O I：
10.3749/canmin.1900034a
中图分类号：
学科分类号：
摘要：
Rapidly formed eutectic textures are observed in Fe silicides in a fulgurite from Michigan. The 14 cm-diameter fulgurite was formed in sandy glacial till in 2014 near Houghton Lake, Michigan. Spherical droplets of iron silicides up to ~200 lm in diameter were found in the natural glass. Back-scattered electron images of some droplets show a eutectic intergrowth texture of two iron silicides with individual crystals up to ~1 lm in maximum dimension. X-ray diffraction study showed the specimens to be an intergrowth of naquite (FeSi) and linzhiite (FeSi2) or naquite and xifengite (Fe5Si3). Droplets also contain minor native silicon, Fe-Ti silicides, and/or other Ti- rich phases which were discovered during TEM observations. It is important to note that the lower-temperature phase luobusaite (Fe3Si7) was not observed in any droplets, indicating rapid quenching of the fulgurite, consistent with a natural origin during a lightning strike as opposed to an artificial origin, e.g., resulting from a downed power line. © 2019 Mineralogical Association of Canada. All rights reserved.
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页码：115 / 123
页数：8
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