The significance of fractional crystallization in the petrogenesis of Apollo 17 Type A and B high-Ti basalts

Details The significance of fractional crystallization in the petrogenesis of Apollo 17 Type A and B high-Ti basalts The significance of fractional crystallization in the petrogenesis of Apollo 17 Type A and B high-Ti basalts

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1817n&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, June 1990, p. 1817-1833.

Computer Science

8

Apollo 17 Flight, Basalt, Crystallization, Lunar Composition, Petrography, Titanium Oxides, Glass, Metal Compounds, Olivine, Pyroxenes, Spinel, Trace Elements, Moon, Fractional Crystallization, Petrogenesis, Apollo 17 Mission, Data, Titanium, Basalt, Samples, Lunar, Mineralogy, Petrography, Chemistry, Comparisons, Composition, Major Elements, Trace Elements, Formation, Origin, Photomicrographs, Models, Chromium, Lanthanum, Pyroxene, Metal, Olivine, Plagioclase, Ilmentite, Almalcolite, Spinel, Glasses, Textu

Scientific paper

Whole-rock and mineral analyses of 26 'new' type A and B Apollo 17 basalts are reported. The petrography and mineral chemistry of these basalts are similar to previously reported Apollo 17 basalts. However, these 'new' whole-rock data extend the compositional ranges of previously reported type A and B basalts and require the division of the type B basalts into type B1 and B2 varieties. These three types display similar trends when both major and trace elements are plotted against a fractionation index of Cr/La ratio. Major element compositions of basalts from all three types fall on olivine + Ti oxide control lines. This study demonstrates that Apollo 17 type A, B1, and B2 basalts have a relatively simple petrogenesis, with the only postmagma-generation process being fractional crystallization.

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