Apollo 14 Green Volcanic Glasses with a Compositional Memory of Melting Processes in the Lunar Mantle

Details Apollo 14 Green Volcanic Glasses with a Compositional Memory of Melting Processes in the Lunar Mantle Apollo 14 Green Volcanic Glasses with a Compositional Memory of Melting Processes in the Lunar Mantle

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..301d&link_type=abstract

Lunar and Planetary Science, volume 27, page 301

Computer Science

1

Dynamic Melting, Glass: Green, Glass: Volcanic

Scientific paper

The picritic volcanic glasses are generally believed to be samples of primary magmas from the lunar mantle. Although the twenty-four groups define a wide compositional range (e.g., factor of 70 in Ti), these magmas have experimentally determined, multiple-saturation points within the limited pressure-range of 15-25 kilobars. Assuming that these picritic magmas were generated by an isobaric, batch melting process, the source regions of these primary magmas were located at depths of 300-500 km. Although the isobaric, batch melting process was a popular concept in terrestrial MORB petrology until the mid-1980s, dynamic melting processes are now considered to be more realistic for MORB petrogenesis. These concepts have recently been applied to the lunar picritic compositions. Since the mineralogy, phase relations, and bulk composition are known with much less certainty for the lunar mantle than for the terrestrial upper mantle, dynamic melting models for the primary lunar magmas are comparatively under-constrained and non-unique. The challenge becomes even greater if these superheated picritic magmas also assimilated complex, late-stage cumulates during their ascent through the uppermost mantle and lower crust. The fact that the highest-Ti picritic melts become negatively buoyant at >15-20 kilobars provides new constraints on the depths and melt-extraction processes.

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