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application/pdfApollo 12 basalts may be classified into olivine, pigeonite, or ilmenite suites on the basis of MG# and Rb/Sr ratio. Trace-element data demonstrate that the olivine and pigeonite suites are unrelated - any major-element correlation between these two suites is purely fortuitous. The identification of heterogeneity within a vitrophyric basalt has required that other criteria be used in conjunction with petrography to indicate whether an analysis is representative of the whole-rock composition. By using I(Sr) ratios, open-system evolution has been identified in the olivine and possibly the pigeonite suites - ilmenite basalts appear to have evolved through closed-system processes.The petrogenesis of Apollo 12 mare basalts, part 2: identification of distinct olivine & pigeonite suites, and open-system evolutionApollo 12 basalts may be classified into olivine, pigeonite, or ilmenite suites on the basis of MG# and Rb/Sr ratio. Trace-element data demonstrate that the olivine and pigeonite suites are unrelated - any major-element correlation between these two suites is purely fortuitous. The identification of heterogeneity within a vitrophyric basalt has required that other criteria be used in conjunction with petrography to indicate whether an analysis is representative of the whole-rock composition. By using I(Sr) ratios, open-system evolution has been identified in the olivine and possibly the pigeonite suites - ilmenite basalts appear to have evolved through closed-system processes.Clive R. Neal; Matthew D. Hacker
Adobe Acrobat 10.1.9 Paper Capture Plug-in; modified using iTextSharp 4.1.6 by 1T3XTLunar petrology
2015-04-20T15:42:25-05:002015-04-13T08:47:55-05:00Adobe Acrobat 10.1.9
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