Argon-40-argon-39 chronology and petrogenesis along the eastern limb of the Moon from Luna 16, 20 and 24 samples

Details Argon-40-argon-39 chronology and petrogenesis along the eastern limb of the Moon from Luna 16, 20 and 24 samples Argon-40-argon-39 chronology and petrogenesis along the eastern limb of the Moon from Luna 16, 20 and 24 samples

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36.1345c&link_type=abstract

Meteoritics & Planetary Science, vol. 36, no. 10, pp. 1345-1366 (2001)

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Scientific paper

Eighteen new lithic fragments from the Soviet Luna missions have been analyzed with electron microprobe and 40-Ar-39-Ar methods. Luna 16 basalt fragments have aluminous compositions consistent with previous analyses, but have two distinct sets of well-constrained ages (3347 +/- 24 Ma, 3421 +/- 30 Ma). These data, combined with other Luna 16 basalt ages, imply that there were multiple volcanic events filling Mare Fecunditatis. The returned basalt fragments have relatively old cosmic-ray exposure (CRE) ages and may have been recovered from the ejecta blanket of a young (1 Ga), nearby crater. A suite of highlands rocks (troctolites and gabbros) is represented in the new Luna 20 fragments. One fragment is the most compositionally primitive (Mg# = 91-92) spinel troctolite yet found. Both troctolites have apparent crystallization ages of 4.19 Ga; other rocks in the suite have progressively younger ages and lower Mg#s. The age and composition progression suggests that these rocks may have crystallized from a single source magma, or from similar sources mobilized at the same time. Within the new Luna 24 basalt fragments is a quench-textured olivine vitrophyre with the most primitive composition yet analyzed for a Luna 24 basalt, and several much more evolved olivine-bearing basalts. Both new and previously studied Luna 24 very low-Ti (VLT) basalt fragments have a unimodal age distribution (3273 +/- 83 Ma), indicating that most returned samples come from a single extrusive episode within Mare Crisium much later than the Apollo 17 VLT basalts (3.6-3.7 Ga).

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