Variability of the He<sup>3</sup> and Ne<sup>21</sup> production rates in ordinary chondrites期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Variability of the He³ and Ne²¹ production rates in ordinary chondrites

Authors:	GF Herzog

Institution:	1. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, U.S.A.

Abstract:	Al²⁶ and noble gas contents of 6 ordinary chondrites with $He^{3} Ne^{21}$ 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 $He^{3} Ne^{21}$ 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 $He^{3} Ne^{21}$ ratios, while P_Ne²¹ will be about 30 per cent below normal. In meteorites with low $He^{3} Ne^{21}$ 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.

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