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Volatile metal deposits on lunar soils - Relation to volcanismParallel leaching and volatilization experiments conducted on lunar samples and similar experiments on sphalerite do not supply the information needed to resolve the question of the chemical nature of Pb-204, Zn, Bi, and Tl deposits on lunar soil surfaces. It is proposed that in Apollo 17 mare and terra soils the fractions of Pb-204, Zn, and Tl that are insoluble under mild, hot pH 5 HNO3, leaching conditions and involatile at 600 C were originally surface deposits which became immobilized by migration into the silicate substrate or by chemisorption. Most of the Bi does not seem to be the result of such a deposit. The implication is also that the soils, over their respective times of evolution, were exposed to heavy metal vapors or that an episodic exposure occurred after they had evolved. A sequence of events is proposed to account for orange 74220 and black 74001 glasses by lava fountaining and for soil 74241 as tephra from an explosive volcanic eruption.
Document ID
19780057866
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Reed, G. W., Jr.
(Argonne National Lab. IL, United States)
Jovanovic, S.
(Argonne National Laboratory Argonne, Ill., United States)
Allen, R. O., Jr.
(Argonne National Laboratory, Argonne, Ill.; Virginia University Charlottesville, Va., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 14, 1977
End Date: March 18, 1977
Accession Number
78A41775
Distribution Limits
Public
Copyright
Other

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