Neon and argon in the Allende meteorite

Smith, Stephen P.; Huneke, J. C.; Rajan, R. S.; Wasserburg, G. J.

doi:10.1016/0016-7037(77)90302-7

Cited by 39 publications

(23 citation statements)

References 25 publications

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“…This is in contrast to earlier studies, e.g., Smith et al (1977), who postulated the presence of trapped Ne in volatilerich Allende CAIs based on 20 Ne/ 22 Ne ratios of up to 3.4 in certain temperature steps during step-wise gas release. Also, Göbel et al (1982) and Shukolyukov et al (2001) measured 20 Ne/ 22 Ne ratios of up to 2.7 (Allende CAIs) and 1.9 (Efremovka CAI), respectively (Fig.…”

Section: Normal Trapped Ne-hl Ne-q or Sw-ne In Cais?contrasting

confidence: 99%

“…We infer that-in line with Göbel et al (1982) and Smith et al (1977)-the Ar signatures in fine-and coarse-grained CAIs of the three different primitive meteorites studied here can consistently be explained as mixtures of the two cosmogenic Ar components produced from Ca and Cl. There is no need to introduce a trapped Ar component, as more recently suggested by Russell et al (1998) and Shukolyukov et al (2001).…”

Section: Argonsupporting

confidence: 75%

“…1b) are particularly prone to contamination if large samples are to be taken. Smith et al (1977) estimated matrix contamination between 5 and 50% for all but one of their CAI samples. Those values compare well with our own estimates of contamination, using our data as cosmogenic and trapped end member compositions.…”

Section: Normal Trapped Ne-hl Ne-q or Sw-ne In Cais?mentioning

confidence: 99%

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Noble gas studies in CAIs from CV3 chondrites: No evidence for primordial noble gases

Vogel

Baur

Bischoff

et al. 2004

Meteorit & Planetary Scien

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Noble gas studies in CAIs from CV3 chondrites:No evidence for primordial noble gases Abstract-Calcium-aluminum-rich inclusions (CAIs) were among the first solids in the solar system and were, similar to chondrules, created at very high temperatures. While in chondrules, trapped noble gases have recently been detected, the presence of trapped gases in CAIs is unclear but could have important implications for CAI formation and for early solar system evolution in general. To reassess this question, He, Ne, and Ar isotopes were measured in small, carefully separated and, thus, uncontaminated samples of CAIs from the CV3 chondrites Allende, Axtell, and Efremovka. The 20 Ne/ 22 Ne ratios of all CAIs studied here are <0.9, indicating the absence of trapped Ne as, e.g., Ne-HL, Ne-Q, or solar wind Ne. The 21 Ne/ 22 Ne ratios range from 0.86 to 0.72, with fine-grained, more altered CAIs usually showing lower values than coarse-grained, less altered CAIs. This is attributed to variable amounts of cosmogenic Ne produced from Na-rich alteration phases rather than to the presence of Ne-G or Ne-R (essentially pure 22 Ne) in the samples. Our interpretation is supported by model calculations of the isotopic composition of cosmogenic Ne in minerals common in CAIs. The 36 Ar/ 38 Ar ratios are between 0.7 and 4.8, with fine-grained CAIs within one meteorite showing higher ratios than the coarse-grained ones. This agrees with higher concentrations of cosmogenic 36 Ar produced by neutron capture on 35 Cl with subsequent β − -decay in finer-grained, more altered, and thus, more Cl-rich CAIs than in coarser-grained, less altered ones.Although our data do not strictly contradict the presence of small amounts of Ne-G, Ne-R, or trapped Ar in the CAIs, our noble gas signatures are most simply explained by cosmogenic production, mainly from Na-, Ca-, and Cl-rich minerals.

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Section: Normal Trapped Ne-hl Ne-q or Sw-ne In Cais?contrasting

confidence: 99%

Section: Argonsupporting

confidence: 75%

Section: Normal Trapped Ne-hl Ne-q or Sw-ne In Cais?mentioning

confidence: 99%

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Noble gas studies in CAIs from CV3 chondrites: No evidence for primordial noble gases

Vogel

Baur

Bischoff

et al. 2004

Meteorit & Planetary Scien

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“…Previous studies have reported very low amounts of trapped noble gases in chondrules (Smith et al 1977;Swindle et al 1991;Kim and Marti 1994;Miura and Nagao 1996;Nakamura et al 1999;Vogel et al 2004), generally attributed to an extensive gas loss from the precursors during chondrule formation. However, Okazaki et al (2001) reported high trapped noble gas concentrations (e.g., up to 7 × 10 −6 cm 3 STP/g 36 Ar) in chondrules (mainly with porphyritic texture) of the enstatite chondrite Yamato (Y)-791790.…”

Section: Introductionmentioning

confidence: 99%

Cosmogenic and trapped noble gases in individual chondrules: Clues to chondrule formation

Das

Murty

2009

Meteorit & Planetary Scien

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“…Elevated 20 Ne/ 22 Ne and 36 Ar/ 38 Ar ratios observed in earlier studies of larger sample amounts ( Fig. 5a; Smith et al, 1977;Göbel et al, 1982;Murty et al, 1996;Russell et al, 1998) can likely be attributed to contamination by matrix material as opposed to the presence of trapped noble gases in CAIs (Vogel et al, 2004).…”

Section: Noble Gasesmentioning

confidence: 69%

Evidence for an early nitrogen isotopic evolution in the solar nebula from volatile analyses of a CAI from the CV3 chondrite NWA 8616

Füri

Chaussidon

Marty

2015

Geochimica et Cosmochimica Acta

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Neon and argon in the Allende meteorite

Cited by 39 publications

References 25 publications

Noble gas studies in CAIs from CV3 chondrites: No evidence for primordial noble gases

Noble gas studies in CAIs from CV3 chondrites: No evidence for primordial noble gases

Cosmogenic and trapped noble gases in individual chondrules: Clues to chondrule formation

Evidence for an early nitrogen isotopic evolution in the solar nebula from volatile analyses of a CAI from the CV3 chondrite NWA 8616

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