Thermoluminescence and the shock and reheating history of meteorites: IV. The induced TL properties of type 4–6 ordinary chondrites

Haq, Munir; Hasan, F. A.; Sears, D. W. G.

doi:10.1016/0016-7037(88)90236-0

Cited by 28 publications

(14 citation statements)

References 34 publications

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“…Perhaps the most obvious feature of these data is the skewing of the Allan Hills data to a lower average sensitivity relative to the non-Antarctic falls. The plot for the Main ice field is very similar to that observed previously for a group of samples collected predominantly in the 1977/1978 and 1978/1979 field seasons [Haq et al, 1988;Sears et al, 1991a]. Among the various Allan Hills fields, there is some indication that the Main ice field data are skewed to slightly lower values of TL sensitivity than the Farwestern field.…”

Section: Resultssupporting

confidence: 83%

“…At both the Cliff resemble most closely the non-Antarctic meteorites. An alternative hypothesis, that the induced TL differences are caused solely by a few unusual falls (i.e., pairing), has been largely discounted by meticulous pairing studies using both cosmogenic isotopes [Schultz et al, 1991] and thermoluminescence [Haq et al, 1988;Sears et al, 1991a]. The present data strongly suggest that terrestrial age is also a relevant factor.…”

Section: Local Ice Movements At the Allan Hills Ice Fiemsmentioning

confidence: 57%

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The natural thermoluminescence of meteorites: 5. Ordinary chondrites at the Allan Hills Ice Fields

Benoit

Sears²,

Sears

1993

J. Geophys. Res.

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Natural thermoluminescence (TL) data have been obtained for 167 ordinary chondrites from the ice fields in the vicinity of the Allan Hills in Victoria Land, Antarctica, in order to investigate their thermal and radiation history, pairing, terrestrial age, and concentration mechanisms. Using fairly conservative criteria (including natural and induced TL, find location, and petrographic data), the 167 meteorite fragments are thought to represent a maximum of 129 separate meteorites. Natural TL values for meteorites from the Main ice field are fairly low (typically 5–30 krad, indicative of terrestrial ages of ∼400 ka), while the Farwestern field shows a spread with many values 30–80 krad, suggestive of < 150‐ka terrestrial ages. There appear to be trends in TL levels within individual ice fields which are suggestive of directions of ice movement at these sites during the period of meteorite concentration. These directions seem to be confirmed by the orientations of elongation preserved in meteorite pairing groups. The proportion of meteorites with very low natural TL levels (<5 krad) at each field is comparable to that observed at the Lewis Cliff site and for modern non‐Antarctic falls and is also similar to the fraction of small perihelia (<0.85 AU) orbits calculated from fireball and fall observations. Induced TL data for meteorites from the Allan Hills confirm trends observed for meteorites collected during the 1977/1978 and 1978/1979 field seasons which show that a select group of H chondrites from the Antarctic experienced a different extraterrestrial thermal history to that of non‐Antarctic H chondrites,

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Section: Resultssupporting

confidence: 83%

Section: Local Ice Movements At the Allan Hills Ice Fiemsmentioning

confidence: 57%

The natural thermoluminescence of meteorites: 5. Ordinary chondrites at the Allan Hills Ice Fields

Benoit

Sears²,

Sears

1993

J. Geophys. Res.

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“…Subsequent to the study of Sears (1980), that showed shock intensities of ~30 GPa could decrease induced TL levels by a factor of about 100, Haq et al (1988) made a study of a large number of naturally shocked ordinary chondrites and found a similar range of induced TL levels. Shock is so prevalent in ordinary chondrites that the petrographic and mineralogical effects have been studied at some length and shock classification schemes have been developed (Stöffler et al, 1988;1991).…”

Section: Shock Effects and Induced Tlmentioning

confidence: 99%

The thermoluminescence of meteorites: A brief 2010 perspective

Sears

2011

Geochronometria

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Early work on meteorite thermoluminescence, influenced by pottery dating and dosimetry applications, demonstrated a relationship between natural thermoluminescence and (1) the orbital perihelion of a meteorite and (2) the terrestrial age (time since fall) of a meteorite. For 14 years natural TL measurements were routinely made on newly recovered Antarctic meteorites to help identify unusual thermal and radiation histories, and to sort them by terrestrial age and perihelion. Two examples of the value of such data are presented, an Antarctic meteorite that underwent a major orbit change prior to fall and the collection mechanics of meteorites at the Lewis Cliff collection site. A second major area of focus for meteorite TL, that has no non-meteorite heritage, is the use of their induced TL to provide an extraordinarily sensitive and quantitative means of exploring metamorphic intensity and palaeothermometry. While especially valuable for unequilibrated ordinary chondrites, these types of measurement have proved useful with virtually every major class of meteorite, asteroidal and planetary. The challenge now is to extend the technique to small particles, micrometeorites, interplanetary dust particles, and cometary particles.

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“…The lone sample with TL sensitivity <0.01 and olivine heterogeneity<25 is Y-790787, and this meteorite contains significant amount of melt glass, suggesting its TL sensitivity has been lowered by shock processing. Olivine heterogeneity data from sources listed in Table 1. feldspar, the TL phosphor, to melt, thus lowering TL sensitivity by~2 orders of magnitude (Haq et al, 1988), but evidence for such intense shock is absent in thin sections ofthese meteorites. Weathering would not lower the TL sensitivity by the 2 orders of magnitude required, and the agreement between paired fragments (Table 2) suggests that we did not sample atypical lithologies.…”

Section: Induced Thermoluminescence Peak Temperature and Widthmentioning

confidence: 99%

Thermoluminescence sensitivity and thermal history of type 3 ordinary chondrites: Eleven new type 3.0–3.1 chondrites and possible explanations for differences among H, L, and LL chondrites

Benoit

Akridge

Ninagawa

et al. 2002

Meteorit & Planetary Scien

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Abstract-We review induced thermoluminescence (TL) data for 102 unequilibrated ordinary chondrites (UOCs), many data just published in abstracts, in order to identify particularly primitive DOCs and further explore TL systematics that may have implications for the history ofthe chondrites and their parent body. We have identified 11 DOCs ofpetrologic types 3.0-3. These samples represent an important new resource for researchers interested in the nature ofprimitive solar system materials. Previously reported trends in which TL sensitivity increases with TL peak temperature and TL peak width, which we interpret in terms of crystallization of feldspar in the ordered or disordered forms during metamorphism, are confirmed by the new data. Importantly, the present data strengthen the trend described earlier in which the mean level of metamorphism experienced by DOCs increases along the series LL, Land H. This suggests either different burial depths for the DOCs from each class, or formation at similar depths in regoliths of different thickness.

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Thermoluminescence and the shock and reheating history of meteorites: IV. The induced TL properties of type 4–6 ordinary chondrites

Cited by 28 publications

References 34 publications

The natural thermoluminescence of meteorites: 5. Ordinary chondrites at the Allan Hills Ice Fields

The natural thermoluminescence of meteorites: 5. Ordinary chondrites at the Allan Hills Ice Fields

The thermoluminescence of meteorites: A brief 2010 perspective

Thermoluminescence sensitivity and thermal history of type 3 ordinary chondrites: Eleven new type 3.0–3.1 chondrites and possible explanations for differences among H, L, and LL chondrites

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