The parental magma for some rocks from the Norite 1 subzone of the Stillwater Complex - A lunar analog study

Details The parental magma for some rocks from the Norite 1 subzone of the Stillwater Complex - A lunar analog study The parental magma for some rocks from the Norite 1 subzone of the Stillwater Complex - A lunar analog study

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...15..591r&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,

Other

Geochemistry, Igneous Rocks, Lunar Rocks, Magma, Petrography, Stratigraphy, Anorthosite, Highlands, Lunar Geology, Rare Earth Elements, Trace Elements, Earth, Stillwater Complex, Parent Material, Magma, Analogs, Comparisons, Plutonic Material, Samples, Terrestrial, Petrography, Major Elements, Trace Elements, Chemistry, Analysis, Models, Oxidation, Composition, Anomalies, Europium

Scientific paper

Single samples from three successive homogeneous but contrasting layers (anorthosite, anorthositic norite, and norite) in the Stillwater Complex Norite 1 subzone were subjected to detailed petrographic and major and trace element chemical analyses. The petrography and the element chemistry of the three layers are found to be generally consistent with formation from a common magma, although a simple model of liquidus phases and trapped magma is not quite consistent with petrography and chemistry. Changes of oxidation level from layer to layer are indicated by both iron in plagioclase and by the distribution coefficient for Eu required for compatibility with a common parent. Such oxidation changes can explain qualitatively the Mg/Fe variation otherwise attributed to trapped liquid. The data demonstrate that for individual lunar highlands igneous rocks, a general picture of the parent magma can be derived, but detailed petrochemical comparisons using a simple trapped liquid model might deny a common parentage for two samples when such in fact existed.

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