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  • 1
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    Activation analysis determination of uranium and Pb 204 in Apollo 11 lunar fines (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Neutron activation analysis determination of uranium and Pb-204 in Apollo 11 fines
    Keywords: SPACE SCIENCES
    Type: 〈LUNAR SURFACE MATER. ANALYSES〈 31 MAR. 1971 (SEE N71-24558 13-30)
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  • 2
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    Isotopic Hg in an Allende carbon-rich residue (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A carbon-rich residue from Allende subjected to stepwise heating yielded two isotopically resolvable types of Hg: one with an (Hg-196)/(Hg-202) concentration ratio the same as terrestrial (monitor) Hg; the other enriched in Hg-196 relative to Hg-202 by about 60 percent. Hg with the 202 isotope enriched relative to 196, as is found in bulk Allende, was not observed. Whether the result of mass fractionation or nucleosynthesis, the distinct types of Hg entered different carrier phases and were not thermally mobilized since the accretion of the Allende parent body.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 25; 345
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  • 3
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    The thermal release of Hg from chondrites and their thermal histories (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A quantitative treatment and implications of isothermal and linear heating data on Hg in meteorites are given as a sequel to a more qualitative analysis of meteorite thermal histories (Reed and Jovanovic, 1968). Studies of Hg in terrestrial metamorphic rocks establish that thermal events to which meteorites were subjected fall in the same temperature range, of 400-900 C, as exists during terrestrial metamorphism. Hg diffusion parameters based on data from the linear and isothermal heating experiments are calculated. The conclusions are: (1) Meteorites experienced thermal events of the same magnitude as those measured by primarily mineralogical metamorphic indicators reviewed by Dodd (1969); (2) no correspondence with mineralogical-petrological metamorphic grade is evident; (3) Hg data for some chondrites correlate with shock facies (non-thermal) indicators (Dodd and Jarosewich, 1979); (4) small Hg activation energies (6-14 kcal/mole) require that the meteorites must have been stored in closed systems until low temperatures were attained. Hg must be presented as an involatile mineral(s) or as a substituent in a host phase at temperatures below 100 C. Consistent with this interpretation is the fact that despite diffusion times of 100-1,000,000 years at 200 K, Hg was retained in small objects over cosmic ray exposure periods of a hundred-million years.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 49; 1743-175
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  • 4
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    Lunar bulk sample trace element contents and KREEP. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The geochemical coherence of KREEP-related labile (Cl) and refractory (F, K, P, and REE) elements in lunar soils is shown to provide some insights into the evolution of the lunar samples studied. Thus, this coherence may help define the physical conditions under which the samples evolved. These conditions range from high temperatures and relatively open systems for mare basalts to moderate temperatures and closed systems for KREEP-related material. The water leachable Cl may be the residuum of the Cl-containing phase with which mare and KREEP source material equilibrated.
    Keywords: CHEMISTRY
    Type: The Moon; 8; July-Aug
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  • 5
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    Fluorine in lunar samples - Implications concerning lunar fluorapatite. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Geochimica et Cosmochimica Acta; 37; June 197
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  • 6
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    The halogens in Luna 16 and Luna 20 soils. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The halogens, uranium, and lithium contents found in Luna 16, Luna 20, and some Apollo lunar soil samples are discussed. Chlorine and phosphorus pentoxide do not appear to exhibit the same correlation in soils from the Luna 20 and possibly the Luna 16 sites as they do in samples from the Apollo 11-15 sites.
    Keywords: SPACE SCIENCES
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  • 7
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    Trace elements profiles, notably Hg, from a preliminary study of the Apollo 15 deep-drill core. (1972)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The possible thermal gradient near the surface during a lunation is considered together with the heat flow from the interior, the physical process of Hg migration, the results from core and trench samples from previous missions, and other temperature sensitive phenomena that may help understand the processes. U, Os, and Ru concentrations in the deep drill core samples are of potential interest and are summarized in a table. The Os tends to parallel the Hg profile with depth.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 16; Oct. 197
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  • 8
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    Hg and Pt-metals in meteorite carbon-rich residues - Suggestions for possible host phase for Hg (1980)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Carbon-rich and oxide residual phases have been isolated from Allende and Murchison by acid demineralization for the determination of their Hg, Pt-metal, Cr, Sc, Co, and Fe contents. Experimental procedures used eliminated the possibility of exogenous and endogenous contaminant trace elements from coprecipitating with the residues. Large enrichments of Hg and Pt-metals were found in Allende but not in Murchison residues. Hg-release profiles from stepwise heating experiments suggest a sulfide as the host for Hg. Diffusion calculations for Hg based on these experiments indicate an activation energy of 7-8 kcal/mol, the same as that for Hg in troilite from an iron meteorite. This is further support for a sulfide host phase for Hg. Equilibration of Hg with this phase at approximately 900 K is indicated. Reasons for the presence of Pt-metals in noncosmic relative abundances are explored.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 44; Oct. 198
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  • 9
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    Heavy element affinities in Apollo 17 samples (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Pb-204, Bi, Tl, and Zn in samples from the Apollo 17 site exhibit relationships not found in samples from other sites. Pb-204, Tl, and Zn in residues remaining after dilute acid leaching are correlated with one another. Orange soil 74220, which is enriched in Pb-204, Tl, and Zn, is included in these relationships. In addition, the submicron metallic phase generally associated with agglutinate formation is correlated with all three of these elements; this relationship has already been reported for Pb-204 in other samples. Thus, orange soil and agglutinates appear to be involved in concentrating heavy volatile metals. A process other than mixing is required to account for this. As a consequence of the isolation of the landing site by the surrounding massifs, local supply and recycling of volatile trace elements in soils may account for some of the interelement relations.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 27; 2, Se; Sept
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  • 10
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    History of Boulder 1 at Station 2, Apollo 17 based on trace element interrelationships (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Correlations among the trace and minor element pairs Cl and Br, Cl and P2O5, and Ru and Os, present in parent igneous rocks, generally survived the processes of boulder breccia formation. Fractions of Cl, Br, and Hg that are mobilized by water leaching or volatilization at moderate temperatures place constraints on the thermal history of Boulder 1 and its component breccias. Since, and possibly during, consolidation, the boulder has probably not been subjected to temperatures in excess of 450 C. The parent rocks of the Apollo 17 boulder and breccia samples studied could have been derived from two initial magmas. Vapor clouds from apparently external sources permeated the source regions of the boulders.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: The Moon; 14; Nov
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