| Oxygen isotopic composition of fulgurites from the Egyptian Sahara and other locations. | |
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MedLine Citation:
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PMID: 22847696 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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RATIONALE: Fulgurites are glassy crusts or hollow glassy tubes formed by the impact of a lightning strike on a target material on the Earth's surface. The oxygen isotopic composition of fulgurites has never been measured and, consequently, it is unknown whether or not isotopic fractionations take place between the target material and the fulgurite glass during the lightning event which is an excellent natural example of extremely fast melting process. METHODS: Following well-established procedures (high-temperature reaction of the fulgurite material with BrF(5) , conversion into CO(2) of the evolved O(2) and measurement of the(18) O/(16) O ratio on a Finnigan Delta S mass spectrometer) we measured for the first time the oxygen isotopic composition of sets of fulgurites coming from various locations on the Earth's surface. RESULTS: The range of isotopic values is quite large, probably reflecting the oxygen isotopic values of the target materials. In the case of fulgurites from the Sahara Desert the isotopic values obtained from the bulk material, quartz crystals sticking to the fulgurite body, tiny samples of loose sand coming from fulgurite bubbles, and sand samples collected near the fulgurites, are very close to one another. CONCLUSIONS: Although we do not have indisputable evidence, we conclude that, at least in the case of oxygen, the fusion process of the material struck by lightning, as well as all the extremely fast high-temperature fusion processes, probably take place without any isotopic fractionation effect. Copyright © 2012 John Wiley & Sons, Ltd. |
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Authors:
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Antonio Longinelli; Romano Serra; Giampaolo Sighinolfi; Enricomaria Selmo; Maria Sgavetti |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Rapid communications in mass spectrometry : RCM Volume: 26 ISSN: 1097-0231 ISO Abbreviation: Rapid Commun. Mass Spectrom. Publication Date: 2012 Sep |
Date Detail:
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Created Date: 2012-07-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8802365 Medline TA: Rapid Commun Mass Spectrom Country: England |
Other Details:
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Languages: eng Pagination: 1980-4 Citation Subset: IM |
Copyright Information:
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Copyright © 2012 John Wiley & Sons, Ltd. |
Affiliation:
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Department of Physics and Earth Sciences, University of Parma, Viale G. P. Usberti 157A, 43124, Parma, Italy. antonio.longinelli@unipr.it. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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