The natural thermoluminescence of meteorites: III. Lunar and basaltic meteorites
- Univ. of Arkansas, Fayetteville (United States)
Natural thermoluminescence (TL) data have been obtained for the lunar meteorite MacAlpine Hills 88104/5 and for 65 eucrites, howardites, diogenites, and mesosiderites in order to investigate their recent thermal and radiation histories. All these meteorites have low levels of natural TL compared to chondrites, which is primarily because they display anomalous fading (i.e., fading by non-classical mechanisms). However, some have especially low natural TL (<5 krad at 250C in the glow curve) which cannot be attributed to anomalous fading or thermal fading over especially large terrestrial ages, and which must reflect heating within the last 10{sup 5}-10{sup 6} y. The fraction of basaltic meteorites thought to have had small perihelia (about 20%) is comparable to the fraction of chondrites with low natural TL and to the fraction of observed falls and fireballs with small perihelia. This may imply ejection from the asteroid belt via similar mechanisms. Assuming plausible values for cosmic ray dose rate, and that the natural TL of MAC88104/5 was totally drained by ejection form the moon, the parameters for TL decay determined in the present study suggest that the Moon-Earth transit times for MAC88104 and MAC88105, were 2,00 and 1.800 y, respectively, compared with 19,000 and 2,500 y for Y791197 and ALHA81005 were ejected from the moon by the same event should be considered, since diverse rock types are found in close proximity on the lunar surface. The natural TL data confirm most previous published pairings among basaltic meteorites and suggest others.
- OSTI ID:
- 5142594
- Report Number(s):
- CONF-9003166-; CODEN: GCACA
- Journal Information:
- Geochimica et Cosmochimica Acta; (United States), Vol. 55:11; Conference: 21. lunar and planetary science conference, Houston, TX (United States), Mar 1990; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
METEORITES
GEOLOGIC HISTORY
ISOTOPE DATING
BASALT
CHEMICAL COMPOSITION
COSMIC RADIATION
IRRADIATION
LUNAR MATERIALS
PETROGENESIS
RADIATION EFFECTS
THERMOLUMINESCENCE
AGE ESTIMATION
IGNEOUS ROCKS
IONIZING RADIATIONS
LUMINESCENCE
MATERIALS
RADIATIONS
ROCKS
VOLCANIC ROCKS
580000* - Geosciences