Abstract
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 low4He 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 cosmogenic3He and4He are correlated with both GRV 98002 and Guangmingshan.
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Ju, Y. T., Liu, X. H., Meteorites collected from the Grove Mountains region, Chin. J. Polar Res. (in Chinese), 2000, 12(2): 137–141.
Lin, Y. T., Wang, D. D., Liu, J. et al., Petrological and mineralogical study of Zhuanghe and Guangmingshan chondrites, Chin. J. Space Sci. (in Chinese), 2001, 21(1): 36–41.
Eugster, O., Cosmic-ray production rates for2He,21Ne,38Ar,83Kr, and126Xe in chondrites based on81Kr-Kr Exposure ages, Geochim. Cosmochim. Acta, 1988, 52(6): 1649–1662.
Wang, D. D., Yi, W. X., Otto, E., A study of noble gases in chondrites from China, Geochimica (in Chinese), 1992(4): 313 -333.
Wang, D. D., Chen, Y. T., Li, Z. H. et al., Introduction to Chinese Meteorites (in Chinese), Beijing: Science Press, 1993, 505.
Wang, D. D., Wang, R. T., Noble gas and cosmic-ray exposure age of the Juancheng chondrite, Chin. Sci. Bull., (in Chinese), 1999, 44(12): 1142–1143.
Wang, D. D., Lin, Y. T., Liu, J. Y., Cosmic-ray exposure and gas retention ages of the Guangmingshan chondrite, Chin. Sci. Bull. (in Chinese), 2001, 46(18): 1544–1546.
Grossman, J. N., The Meteoritical Bulletin, Meteorit. Planet. Sci., 2000, 35(Suppl.): A206.
Marti, K., Graf, T., Cosmic ray exposure history of ordinary chondrites, Ann. Rev. Earth Planet. Sci., 1992, 20: 221–243.
Polnau, E., Eugster, O., Krahenbuhl, U. et al., Evidence for a precompaction exposure to cosmic rays in a chondrule from the H6 chondrite ALH76008, Geochim. Cosmochim. Acta, 1999, 63(6): 925–933.
Eugster, O., Michel, T., Nidermann, S. et al., The record of cosmogenic, radiogenic, fissiogenic, and trapped noble gases in recently recovered Chinese and other chondrites, Geochim. Cosmochim. Acta, 1993, 57(6): 1115–1142.
Xie Xiande, Chen Ming, Dai Chengda et al., Characteristics in naturally and experimentally shocked chondrites: A clue to P-T conditions of impacted asteroids, Science in China, Ser. D, 2000, 43: 480–486.
Chen Ming, Xie Xiande, El Goresy, A. et al., Cooling rate in the shock veins of chondrites: Constraints on the (Mg, Fe)2 SiO4 polymorph transformations, Science in China, Ser. D, 1998, 41: 514–521.
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Wang, D., Lin, Y., Liu, X. et al. Cosmic-ray exposure histories of two Antarctic meteorites from Chinese collections and the Guangmingshan and Zhuanghe chondrites. Sci. China Ser. D-Earth Sci. 46, 1236–1240 (2003). https://doi.org/10.1007/BF02883249
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DOI: https://doi.org/10.1007/BF02883249