Olivine crystals and the petrogenesis of the Apollo 15 olivine-normative mare basalts. I - Petrography

Details Olivine crystals and the petrogenesis of the Apollo 15 olivine-normative mare basalts. I - Petrography Olivine crystals and the petrogenesis of the Apollo 15 olivine-normative mare basalts. I - Petrography

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..553h&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 553.

Other

Olivine, Petrogenesis, Apollo 15 Flight, Basalt, Petrography, Chemical Analysis, Pyroxenes, Crystallization

Scientific paper

Our chemical analyses of a suite of 25 Apollo 15 olivine-normative mare basalt samples, using splits of 4 to 5 g, validated previous conclusions that the suite chemistry is controlled by olivine. However, the simplicity of the chemical model is not matched by a corresponding simplicity of petrographic features, such as can be interpreted as a sequence that includes cumulate olivines and successive flow fractionates. Vesicular samples occur for both coarse and fine grain sizes. The question then is where the olivine separation that controls the chemistry of the Apollo 15 olivine-normative mare basalts took place, and how the samples came to crystallize to what they are now. In the present study, we are evaluating the characteristics of the olivine itself in an effort to constrain the crystallization and subsolidus histories of each sample. With consideration of other rock characteristics, such as the grain size and shape of other minerals, in particular pyroxene and plagioclase, we can further understand the cooling histories and recognize how the process of olivine separation was physically achieved. A specific goal is to assess if the olivine separation took place in surface flows or in subsurface magma chambers, and whether each sample, or small subgroups of samples with similar compositions, represent separate intrusions and flows. We here discuss some of the petrographic observations.

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