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Lightning and Mass Independent Oxygen Isotopic Fractionation in Nebular SilicatesLightning has long been postulated as the agent of Chondru|e formation in the solar nebula, but it may have an additional role to play as well. Lightning bolts of almost any scale will both vaporize dust and liberate oxygen atoms that will then interact with both nebular gases as well as the refractory silicate vapor as it re-condenses. Such processes should result in the addition of the heavy oxygen isotopes to the growing silicate grains while the light oxygen-16 becomes part of the gas phase water. This process will proceed to some extent throughout the history of any turbulent nebula and will result in the gradual increase of O-16 in the gas phase and in a much larger relative increase in the O-17 and O-18 content of the nebular dust. Laboratory experiments have demonstrated the production of such "heavy oxygen enriched", non-mass-dependently-fractionated dust grains in a high voltage discharge in a hydrogen rich gas containing small quantities of silane, pentacarbonyl iron and oxygen.
Document ID
20090032020
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Nuth, Joseph A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
July 5, 2009
Subject Category
Lunar And Planetary Science And Exploration
Meeting Information
Meeting: Gordon Research Conferences
Location: South Hadley, MA
Country: Yemen, Republic of
Start Date: July 5, 2009
End Date: July 10, 2009
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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