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Record Details

Record 27 of 1845
Ca isotope fractionation on the moon
Author and Affiliation:
Russell, W. A.(California Inst. of Tech., Pasadena, CA, United States)
Papanastassiou, D. A.(California Inst. of Tech., Pasadena, CA, United States)
Tombrello, T. A.(California Inst. of Tech., Pasadena, CA, United States)
Epstein, S.(California Institute of Technology, Pasadena, Calif., United States)
Abstract: Ca has been measured in a lunar soil in order to establish the presence of isotopically mass-fractionated components. Ca was extracted by a series of water leaches after the soils were 'activated' by brief exposures to fluorine gas. The O2 obtained by this fluorination is found to have delta (O-18) of +21 per mil and to be, therefore, significantly mass-fractionated. Ca obtained in the leaches was analyzed using the double-spike technique. Very small Ca isotope fractionation is found in the leaches of this soil of up to 1 per mil per mass unit difference. The small Ca effects are in marked contrast to the measured delta (O-18) for the same sample and to large effects observed in many soils for oxygen, silicon, sulfur, and potassium. The data on Ca provide stringent constraints on models which attempt to explain the isotope mass-fractionation effects in lunar soils.
Publication Date: Jan 01, 1977
Document ID:
19780057859
(Acquired Dec 01, 1995)
Accession Number: 78A41768
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Conference Proceedings
Publication Information: SEE A78-41551 18-91
Publisher Information: United States
Meeting Information: 8th Lunar Science Conference; March 14-18, 1977; Houston, TX
Contract/Grant/Task Num: NSF PHY-76-02724; NGR-05-002-333; NGL-05-002-188; NGL-05-002-190
Financial Sponsor: NASA; United States
Organization Source: California Inst. of Tech.; Pasadena, CA, United States
Description: 15p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CALCIUM ISOTOPES; CHEMICAL FRACTIONATION; FLUORINATION; ISOTOPE EFFECT; LUNAR SOIL; CHEMICAL ANALYSIS; MASS SPECTROSCOPY; OXYGEN; POTASSIUM; SILICON; SULFUR
Imprint And Other Notes: In: Lunar Science Conference, 8th, Houston, Tex., March 14-18, 1977, Proceedings. Volume 3. (A78-41551 18-91) New York, Pergamon Press, Inc., 1977, p. 3791-3805.
Availability Source: Other Sources
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