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Lunar thermal history revisited.New information is used to demonstrate that better models for the thermal history of the moon are required. As a first step, account is taken of (1) a nonuniform initial composition in terms of fraction of low melting to high melting phase present, and for variation in the uranium, potassium, and thorium contents as a function of depth, (2) partitioning of the radioactive elements between the melt and the solid phases, and (3) a cutoff value of melt which must be exceeded before magma can move to the surface. The results of several attempts to determine whether reasonable conditions, composition, and thermal properties can be expected to give rise to two separate periods of volcanism are discussed. Two models with somewhat different distributions of radioactive heat sources and different conductivities are examined.
Document ID
19720058863
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mcconnell, R. K., Jr.
(Earth Science Research, Inc. Cambridge, Mass., United States)
Gast, P. W.
(NASA Manned Spacecraft Center Houston, Tex., United States)
Date Acquired
August 6, 2013
Publication Date
September 1, 1972
Subject Category
Space Sciences
Accession Number
72A42529
Funding Number(s)
CONTRACT_GRANT: NAS9-11968
Distribution Limits
Public
Copyright
Other

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