TABLE 4: Natural Thermoluminescence (NTL) Data for Antarctic Meteorites
Paul H. Benoit and Derek W.G. Sears
University of Arkansas
Fayetteville, AR 72701 USA
The measurement and data reduction methods were described by Hasan et al. (1987, Proc. 17th LPSC, E703-E709; 1989, LPSC XX, 383-384). For meteorites whose TL lies between 5 and 100 krad, the natural TL is related primarily to terrestrial history. Samples with NTL <5 krad have TL levels below that which can reasonably be ascribed to long terrestrial ages. Such meteorites have had their TL lowered by heating within the last million years or so by close solar passage, shock heating, or atmospheric entry, exacerbated in the case of some achondrites by anomalous fading.
The quoted uncertainties are the standard deviations shown by replicate measurements on a single aliquot.
COMMENTS: The following comments are based on natural TL data, TL sensitivity, the shape of the induced TL glow curve, classifications, and JSC and Arkansas sample descriptions.
GRA 98098 has a TL sensitivity similar to Y-75011, a petrologic type 1 and the least equilibrated eucrite in the classification system of Takeda et al. (1983, Proc. 8th Symp. Antarctic Meteor., 181-205) and Batchelor and Sears (1991, GCA, 55, 3831-3844). GRA 98033 has a TL sensitivity similar to eucrites of petrologic type 5.
Pairings suggested by TL data: