Oxidation States During Ascent and Eruption of the 74001/2 Orange Glass Magma

Details Oxidation States During Ascent and Eruption of the 74001/2 Orange Glass Magma Oxidation States During Ascent and Eruption of the 74001/2 Orange Glass Magma

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1413w&link_type=abstract

Lunar and Planetary Science, volume 27, page 1413

Computer Science

Glass: Lunar, Metal: Iron-Nickel, Moon, Oxidation State

Scientific paper

While 99% of the 74001/2 lunar core section is composed of orange glasses and their crystallized equivalents (black beads), some olivine phenocrysts and metallic blebs have also been identified. Searching through the 26 thin sections that represent the 68-cm deep core, we have identified 29 metallic blebs larger than 4 micrometers in size: 14 are enclosed in or trapped between olivine phenocrysts, 14 are enclosed in volcanic beads, and one metallic fragment was found by itself. Most metal blebs are spherical; the largest is 44 micrometers in diameter but most of the blebs in the volcanic beads are <10 micrometers. Microprobe analyses show that the metallic blebs can be divided into three major classes: (1) Fe-Ni-Co spheres enclosed inside or trapped between olivine crystals; (2) Fe-Ni-Co metal blebs enclosed inside volcanic beads; and (3) smaller (<5 micrometers) and very irregular shaped Fe metallic blebs in the crystallized black beads. Each of these three types of metal blebs represents a different oxidation and/or temperature history in the conduit or during eruption in the fire fountain. In this study, we have used the compositions of the blebs to determine the oxidation states when the blebs initially formed and how the conditions changed during ascent and eruption of the magma. Our goal is to apply these results in order to model the ascent and eruption of the volcanic beads that compose the regional dark mantle deposits.

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