Other
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.957...47t&link_type=abstract
Origin of the Earth and Moon, Proceedings of the Conference held 1-3 December, 1998 in Monterey, California. LPI Contribution N
Other
Lunar Rocks, Magma, Metallicity, Trace Elements, Transition Metals, Selenology, High Resolution, Ion Probes, Quantitative Analysis, Feldspars
Scientific paper
Records of the transition-metal trace elements in plagioclase together with magmatophile elements in zoned plagioclase are significant in estimating the evolution of magmas. Ion microprobe analyses of lunar plagioclase of previous works have successfully estimated the primary characteristics of magmas and their source. Transition metal abundance, however, has not been well analyzed despite their significance. Quantitative analysis of Mg, Sc, Ti, V, Mn, Fe, Co, and Cu was applied with K, Sr, Ba, and major elements by using high-sensitivity and high-mass-resolution ion microprobe. Detection limits of Sc and Co are less than a few tens of parts per billion and are low enough to detect the concentration of these elements in the plagioclase in differentiated rocks with low Mg#. Concentrations of other elements in igneous plagioclase are much higher than detection limits. Spatial resolution is 15-5 microns and small enough to eliminate melt inclusions. We have applied this method to well documented arc magmas. The results show that plagioclase preserves the heterogeneity of source mantle, degrees of partial melting, and differentiation of magmas. This method of analyzing trace elements in plagioclase allows us to investigate magmatic processes during lunar crustal formation.
Kita Noriko T.
Morishita Yuichi
Togashi Shigeko
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