Partitioning of Zr and Nb between coexisting opaque phases in lunar rocks _ Determined by quantitative proton microprobe analysis

Details Partitioning of Zr and Nb between coexisting opaque phases in lunar rocks _ Determined by quantitative proton microprobe analysis Partitioning of Zr and Nb between coexisting opaque phases in lunar rocks _ Determined by quantitative proton microprobe analysis

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68...19b&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 68, no. 1, April 1984, p. 19-33.

Computer Science

5

Chemical Analysis, Electron Probes, Lunar Rocks, Microanalysis, Niobium, Zirconium, Apollo 17 Flight, Carbon, Opacity, X Ray Imagery, Moon, Rocks, Samples, Lunar, Partitioning, Zirconium, Niobium, Phases, Proton Microprobe, Analysis, Opacity, Optical Properties, Apollo 17, Armalcolite, Ilmenite, Mineralogy, Origin, Basalts, Partitioning, Apollo 15, Ulvospinel, Features, Description, Distribution, Apollo 14, 14305, Clasts, Breccias, Landing Sites, Comparisons, Equilibration

Scientific paper

The chemical partitioning among coexisting opaque phases of various assemblages in different lunar rocks from several landing sites is studied using electron microprobe techniques for major and minor elements and proton microprobe analyses for trace elements. In Apollo 17 rocks, the partitioning of Zr between armalcolite and ilmenite is determined in rocks showing different crystallization sequences. In olivine porphyritic basalts, Zr partitions in favor of armalcolite, probably due to equilibration between armalcolite and ilmenite achieved by the reactions involving armalcolite. Apollo 15 basalts contain ulvoespinel/ilmenite-bearing assemblages of entirely different origins: (1) subsolidus reactions leading to 'exosolution' of ilmenite from ulvoespinel and (2) isobarically invariant reaction leading to formation of ilmenite + fayalite as a result of the reaction between ulvoespinel + silica.

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