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| 1 | Cosmic-ray exposure histories of two Antarctic meteorites from Chinese collections and the Guangmingshan and Zhuanghe chondrites显示文摘Concentrations of noble gases of two Antarctic meteorites (GRV 98002, 98004) from Chinese collections, and the Guangmingshan and Zhuanghe chondrites were measured. Based on the petrography and mineralogy of these meteorites, and production rates of the cosmogenic nuclides, we calculated cosmic-ray exposure and gas retention ages of the four chondrites. Exposure ages of the four chondrites are 0.052 Ma 0.008 Ma (GRV 98004, H5), 17.0 Ma 2.5 Ma (GRV98002, L5), 3.8 Ma 0.6 Ma (Zhuanghe, H5), and 68.9 Ma 10 Ma (Guangmingshan, H5), respectively. The exposure age of GRV 98004 is the lowest value of Antarctic meteorites reported up to date; while that of Guangmingshan is higher than other Chinese meteorites of H-group. Both GRV 98002 and Zhuanghe have low 4He concentrations, probably due to shock effects or solar heating at orbits with small perihelion distances during cosmic-ray exposure. On the other hand, losses of cosmogenic 3He and 4He are correlated with both GRV 98002 and Guangmingshan. | 王道德 林杨挺 刘小汉 琚宜太 | 2003 | Science China Earth Sciences2003，46，12： | 7 |
| 2 | 钙长辉长无球粒陨石NWA 12274/12275/12276/12277/12278稀有气体及年代学研究显示文摘岩石矿物学研究发现HED(Howardite-Eucrite-Diogenite)族陨石NWA 12274/12275/12276/12277/12278与NWA 11586可能为成对陨石,但需要稀有气体等证据支持。本次工作对这5块陨石开展了稀有气体、宇宙暴露(CRE)年龄和气体保存年龄研究。结果发现它们具有相一致的稀有气体同位素比值和CRE年龄,表明NWA系列陨石互为降落成对陨石;陨石CRE年龄[(36.2±3.7)Ma]与灶神星主要溅射事件/时期年龄(35.0~42.5 Ma)一致,表明它们可能在约36 Ma前从灶神星或V型小行星溅离;陨石的U、Th-^(4)He(T4)及^(40)K-^(40)Ar(T_(40))气体保存年龄分别为0.3~1.3 Ga和2.8~3.4 Ga,显示这些陨石不同程度受到了后期热事件的影响;该流星体进入大气层的初始半径约为12.2 cm,在穿越大气层期间质量损失了约56%。 | 张川统 缪秉魁 贺怀宇 苏菲 解庆林 | 2021 | 矿物岩石地球化学通报2021，40，5： | 1 |
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