title: Glazed lunar rocks: origin by impact.
abstract: The glassy coating of lunar rock 12017 is enriched in 15 trace elements relative to the crystalline interior. It apparently consists chiefly of shock-melted rock, somewhat richer in rare earth elements and alkali metals than rock 12017 itself. The glass has been contaminated by about 0.5 percent carbonaceous-chondrite-like material or, alternatively, by a mixture of 0.06 to 0.3 percent fractionated meteoritic material and approximately 10 to 15 percent local soil. The glazing seems to represent molten material splashed from a nearby meteorite impact and not in situ melting by a sudden increase in solar luminosity.
authors.forename: J W
authors.initials: JW
authors.lastname: Morgan
authors.forename: J C
authors.initials: JC
authors.lastname: Laul
authors.forename: R
authors.initials: R
authors.lastname: Ganapathy
authors.forename: E
authors.initials: E
authors.lastname: Anders