COSMIC-RAY PRODUCED, RADIOGENIC, AND SOLAR NOBLE-GASES IN LUNAR METEORITES QUEEN-ALEXANDRA-RANGE-94269 AND QUEEN-ALEXANDRA-RANGE-94281

We measured the noble gas isotopic abundances in lunar meteorite QUE 9 4269 and in bulk-, glass-, and crystal-phases of lunar meteorite QUE 9 4281. Our results confirm that QUE 94269 originated from the same mete orite fall as QUE 93069: both specimens yield the same signature of so lar-particle irradiation and also the cosmogenic noble gases are in ag reement within their uncertainities. Queen Alexandra Range 93069/94269 was exposed to cosmic rays in the lunar regolith for similar to 1000 Ma, and it trapped 3.5 x 10(-4) cm(3)STP/g solar Ar-36, the other sola r noble gases being present in proportions typical for the solar-parti cle irradiation. The bulk material of QUE 94281 contains about three t imes less cosmogenic and trapped noble gases than QUE 93069/94269 and the lunar regolith residence time corresponds to 400 +/- 60 Ma. We sho w that in lunar meteorites the trapped solar Ne-20/Ne-22 ratio is corr elated with the trapped ratio Ar-40/Ar-36, that is, trapped Ne-20/Ne-2 2 may also serve as an antiquity indicator. The upper limits of the br eccia compaction ages, as derived from the trapped ratio Ar-40/Ar-36 f or QUE 93069/94269 and QUE 94281 are similar to 400 Ma and 800 Ma, res pectively. We found very different regolith histories for the glass ph ase and the crystals separated from QUE 94281. The glass phase contain s much less cosmogenic and solar noble gases than the crystals, in con trast to the glasses of lunar meteorite EET 87521, that were enriched in noble gases relative to the crystalline material. The QUE 94281 pha ses yield a K-40-(40)A, gas retention age of 3770 Ma, which is in the range of that for lunar mare rocks.