Concentrations and isotopic compositions of noble gases (He, Ne, Ar, Kr, and Xe) and nitrogen in two ordinary chondrites (OCs), Zag (H3-6) and ALH 77216 (L3.7–3.9), are presented. The aim of the study is to examine the cosmic ray exposure history, radiogenic ages and isotopic signatures of trapped gases in them. The results of stepwise heating analyses indicate that light noble gases (He and Ne) are mixture of trapped and cosmic ray produced components. Neon isotopes are enriched from solar wind (SW), while shows a trend towards galactic cosmic ray (GCR) region in both the meteorites. Phase-Q neon is not observed in any of the meteorite. The heavy noble gases Ar, Kr and Xe indicate mixture of Q-HL-SW and cosmogenic. Elemental ratios of trapped ³⁶Ar, ⁸⁴Kr and ¹³²Xe indicate that noble gases in Zag and ALH 77216 are mixtures of the three components Q, HL and SW. The cosmic-ray exposure (CRE) ages calculated from neon for Zag and ALH 77216 are 5.6 ± 0.3 Ma and 28.5 ± 0.4 Ma, respectively. These ages are within the range typically observed for the respective meteorite types of OCs. Nitrogen isotopes indicate presence of multiple components in both the chondrites. Isotopic signature of trapped nitrogen in both the chondrites is distinct from that of SW, Q and HL, indicating additional source of nitrogen in the meteorites.

介绍了两种普通球粒陨石(OC) Zag (H3-6) 和 ALH 77216 (L3.7-3.9 ) 中稀有气体（He、Ne、Ar、Kr 和 Xe）和氮的浓度和同位素组成。该研究的目的是检查宇宙射线暴露历史、放射性年龄和其中捕获气体的同位素特征。逐步加热分析的结果表明，轻惰性气体（He 和 Ne）是捕获组分和宇宙射线产生组分的混合物。氖同位素因太阳风（SW）而富集，同时在两块陨石中都显示出向银河宇宙线（GCR）区域发展的趋势。在任何陨石中都没有观察到 Q 相氖气。重惰性气体Ar、Kr和Xe表示Q-HL-SW和宇宙成因的混合物。^{被捕获的36} Ar、 ⁸⁴的元素比率Kr 和¹³² Xe 表明 Zag 和 ALH 77216 中的稀有气体是 Q、HL 和 SW 三种组分的混合物。根据氖气计算出的 Zag 和 ALH 77216 的宇宙射线暴露 (CRE) 年龄分别为 5.6 ± 0.3 Ma 和 28.5 ± 0.4 Ma。这些年龄在各个 OC 陨石类型通常观察到的范围内。氮同位素表明这两个球粒陨石中都存在多种成分。两个球粒陨石中捕获的氮的同位素特征与 SW、Q 和 HL 的不同，表明陨石中存在额外的氮来源。