Variability of the He3 and Ne21 production rates in ordinary chondrites

G. F. Herzog

doi:10.1016/0016-7037(73)90011-2

Variability of the He³ and Ne²¹ production rates in ordinary chondrites

G. F. Herzog

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Al²⁶ and noble gas contents of 6 ordinary chondrites with He³ Ne²¹ ratios above 6.0 or below 4.0 are used to infer the variability of the production rates of He³ and Ne²¹ (P_He³ and P_Ne²¹). The ratio of the observed Al²⁶ content to a calculated, normal value is taken as a measure of the change of P_Ne²¹ from its normal value. The corresponding change in P_He³ is then computed from the observed He³ Ne²¹ ratio and an average value of P_He³. According to these calculations which exclude orbital effects, P_He³ will be near the average value in meteorites with high He³ Ne²¹ ratios, while P_Ne²¹ will be about 30 per cent below normal. In meteorites with low He³ Ne²¹ ratios, P_He³ may be depressed by as much as 25 per cent from normal while P_Ne²¹ may be 15-20 per cent above the average.

Original language	English (US)
Pages (from-to)	2125-2133
Number of pages	9
Journal	Geochimica et Cosmochimica Acta
Volume	37
Issue number	9
DOIs	https://doi.org/10.1016/0016-7037(73)90011-2
State	Published - Sep 1973
Externally published	Yes

All Science Journal Classification (ASJC) codes

Geochemistry and Petrology

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10.1016/0016-7037(73)90011-2

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@article{7276c071087841c3a0b03b63fce0ce2c,

title = "Variability of the He3 and Ne21 production rates in ordinary chondrites",

abstract = "Al26 and noble gas contents of 6 ordinary chondrites with He3 Ne21 ratios above 6.0 or below 4.0 are used to infer the variability of the production rates of He3 and Ne21 (PHe3 and PNe21). The ratio of the observed Al26 content to a calculated, normal value is taken as a measure of the change of PNe21 from its normal value. The corresponding change in PHe3 is then computed from the observed He3 Ne21 ratio and an average value of PHe3. According to these calculations which exclude orbital effects, PHe3 will be near the average value in meteorites with high He3 Ne21 ratios, while PNe21 will be about 30 per cent below normal. In meteorites with low He3 Ne21 ratios, PHe3 may be depressed by as much as 25 per cent from normal while PNe21 may be 15-20 per cent above the average.",

author = "Herzog, {G. F.}",

note = "Funding Information: Acknowledgements-I am indebted to EDWARD AXDERS for his assistance in planning this study and for his editorial comments. STJMIEO MATSUORA helped with the Alz6 measurements. 0. A. SCHAEFFER kindly permitted me to use the Stony Brook mass spectrometry laboratory. J. G. FUNKHOUSER gave me many helpful suggestions and criticisms. I gratefully acknowledge the critical comments of F. BEQEMANN. This work was supported in part by the Atomic Energy Commission: Contract At(ll-l)-382, and Contract AT(ll-l)-3080.",

year = "1973",

month = sep,

doi = "10.1016/0016-7037(73)90011-2",

language = "English (US)",

volume = "37",

pages = "2125--2133",

journal = "Geochmica et Cosmochimica Acta",

issn = "0016-7037",

publisher = "Elsevier Limited",

number = "9",

}

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T1 - Variability of the He3 and Ne21 production rates in ordinary chondrites

AU - Herzog, G. F.

N1 - Funding Information: Acknowledgements-I am indebted to EDWARD AXDERS for his assistance in planning this study and for his editorial comments. STJMIEO MATSUORA helped with the Alz6 measurements. 0. A. SCHAEFFER kindly permitted me to use the Stony Brook mass spectrometry laboratory. J. G. FUNKHOUSER gave me many helpful suggestions and criticisms. I gratefully acknowledge the critical comments of F. BEQEMANN. This work was supported in part by the Atomic Energy Commission: Contract At(ll-l)-382, and Contract AT(ll-l)-3080.

PY - 1973/9

Y1 - 1973/9

N2 - Al26 and noble gas contents of 6 ordinary chondrites with He3 Ne21 ratios above 6.0 or below 4.0 are used to infer the variability of the production rates of He3 and Ne21 (PHe3 and PNe21). The ratio of the observed Al26 content to a calculated, normal value is taken as a measure of the change of PNe21 from its normal value. The corresponding change in PHe3 is then computed from the observed He3 Ne21 ratio and an average value of PHe3. According to these calculations which exclude orbital effects, PHe3 will be near the average value in meteorites with high He3 Ne21 ratios, while PNe21 will be about 30 per cent below normal. In meteorites with low He3 Ne21 ratios, PHe3 may be depressed by as much as 25 per cent from normal while PNe21 may be 15-20 per cent above the average.

AB - Al26 and noble gas contents of 6 ordinary chondrites with He3 Ne21 ratios above 6.0 or below 4.0 are used to infer the variability of the production rates of He3 and Ne21 (PHe3 and PNe21). The ratio of the observed Al26 content to a calculated, normal value is taken as a measure of the change of PNe21 from its normal value. The corresponding change in PHe3 is then computed from the observed He3 Ne21 ratio and an average value of PHe3. According to these calculations which exclude orbital effects, PHe3 will be near the average value in meteorites with high He3 Ne21 ratios, while PNe21 will be about 30 per cent below normal. In meteorites with low He3 Ne21 ratios, PHe3 may be depressed by as much as 25 per cent from normal while PNe21 may be 15-20 per cent above the average.

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VL - 37

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JO - Geochmica et Cosmochimica Acta

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SN - 0016-7037

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ER -

Variability of the He³ and Ne²¹ production rates in ordinary chondrites

Abstract

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