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The Abundance and Isotopic Signature of Chlorine in UrKREEP: Implications for the Early Degassing of the MoonInitally, the elevated delta-37 Cl values of lunar materials were attributed to volcanic degassing[1]. However, chlorine isotope ratios of apatite in lunarmare basalts appear to reflect mixing between two reservoirs.One component, with elevated delta-37 Cl is greater than or equal to + (25%) ([2] may represent the urKREEP--the final product of the crystallization of the lunar magma ocean. The second component, with delta-37 Cl is approximately (0%), is inferred to represent either a mare basalt reservoir or meteoritic materials. The idea that high delta-37 Cl is related to urKREEP suggest a global enrichment that occurred earlier in the lunar history [2,3]. Here we test this urKREEP-mixing hypothesis more rigorously, and report the observed limits of the model. We then use the results to calculate the Cl content of the urKREEP component and use those results to update estimates of the bulk Cl content of the Moon. This allows us to speculate on the mechanisms of loss of Cl from the lunar magma ocean.
Document ID
20170002382
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Boyce, J. W.
(NASA Johnson Space Center Houston, TX, United States)
Kanee, S.
(California Univ. Los Angeles, CA, United States)
McCubbin, F. M.
(NASA Johnson Space Center Houston, TX, United States)
Barnes, J. J.
(NASA Johnson Space Center Houston, TX, United States)
Bricker, H.
(California Univ. Los Angeles, CA, United States)
Treiman. A. H.
(Lunar and Planetary Inst. Houston, TX, United States)
Date Acquired
March 20, 2017
Publication Date
March 20, 2017
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
JSC-CN-38466
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 20, 2017
End Date: March 24, 2017
Sponsors: Universities Space Research Association, Lunar and Planetary Inst.
Distribution Limits
Public
Copyright
Public Use Permitted.
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