Abstract
Helium isotope compositions of the mantle xenoliths and megacrysts in the Cenozoic basalts in the eastern China were measured. The samples were collected from Ludao of Heilongjiang, Huinan and Jiaohe of Jilin, Kuandian of Liaoning, Hannuoba of Hebei, Nüshan of Anhui, Dingan of Hainan. The3He/4He ratios of the mantle xenoliths and megacrysts from the most areas were about 1 × 10-5, and were similar to those of the MORB, thus reflecting the characteristics of the MORB-typed depleted mantle. The3He/4He ratios of the mantle xenoliths from Jiaohe were 4.8×10-6 and the3He/4He ratios of xenoliths from Hannuoba vary from 0.15× 10-6 to 7.4 ×10-6, obviously lower than those of the MORB, and even lower than the atmospheric helium isotope ratios, indicating that the continental mantle was strongly replaced in Jiaohe and Hannuoba areas. The helium isotope compositions of the mantle xenoliths and megacrysts in the same region vary in a very wide range. It is inferred that the mantle xenoliths and megacrysts were from different parts of the continental mantle. There were not necessary origin relations between the mantle xenoliths, megacrysts and their host basalts. An extremely high3He/4He ratio of garnet megacryst from Hannuoba, Hebei was found.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Molan, E., Zhao Dasheng, The Cenozoic Basalts and Plutonic Xenoliths in the Eastern China (in Chinese), Beijing: Science Press, 1987.
Liu Ruoxin, ed. The Chronology and the Geochemistry of the Cenozoic Volcanic Rocks in the Eastern China (in Chinese), Beijing: Seismology Press, 1992.
Liu, C. Q., Masuda, A., Xie, G. H., Isotope and trace element geochemistry of alkali basalts and associated megacrysts from the Huangyishan volcano, Kuandian, Liaoning, NE China, Chem. Geol., 1991, 97: 219–231.
Liu Congqiang, Masuda, A., Xie Guanghong, REE, Sr and Nd isotope geochemistry of the mantle xenoliths from Huangyishan basalt in Kuandian of Liaoning, Geological Sciences (in Chinese), 1994, 28(3): 228–234.
Xie Guanghong, Zhang Ming, Liu Congqiang, Mantle enrichment events and hydrated minerals-—The evidence from mantle xenoliths and high-pressure megacrysts, in the Geochemistry of the Mantle Fluids and the Asthenosphere (Asthenoliths) (in Chinese) (eds. Du Letian et al.), Beijing: Geological Publishing House, 1996, 272–310.
Du Letian, Geochemistry of Mantle Fluids and Asthenosphere (Asthenoliths) (in Chinese), Beijing: Geological Publishing House, 1996.
Xia Qunke, Chen Daogong, Deloule, E. et al., Hydrogen isotope compositions of mantle-derived mica megacrysts from ion microprobe analysis, Science in China, Ser. D, 1999, 42(4): 392–398.
Zheng Jianping, Lu Fengxiang, O’Reilly, S. Y. et al., The mantle transformation and replacement in the eastern North China: Laserprobe study on clinopyroxenes, Science in China (in Chinese), Ser, D, 2000, 30(4): 373–382.
Ozima, M., Podosek, F. A., Noble gas geochemistry, New York: Cambridge Univ. Press, 1983.
Anderson, D. L., Helium-3 from the mantle: Primordial signal or cosmic dust? Science, 1993, 261: 170–176.
Kurz, M., Jenkins, W. J., Hart, S. R. et al., Helium isotopic variations in volcanic rocks from Loihi Seamount and the island of Hawaii, Earth Planet Sci. Lett., 1983, 66: 388–399.
Rion, W., Craig, H., Helium isotope and mantle volatiles in Loihi Seamount and Hawaiian Islands basalts and xenoliths, Earth Planet Sci. Lett., 1983, 66: 407–426.
Dunai, T. J., Baur, H., Helium, Neon, and argon systematics of the European subcontinental mantle: Implications for its geochemical evolution, Geochim. Cosmochim. Acta, 1995, 59(13): 2767–2783.
Patterson, D. B., Honda, M., Dcdougall, I., Noble gases in mafic phenocrysts and xenoliths from New Zealand, Geochimi. Cosmochim. Acta, 1994, 58(20): 4411–4427.
Xu Sheng, Liu Congqiang, The helium isotope compositions of the mantle xenoliths and their significance in the mantle geochemical evolution, Chinese Science Bulletin (in Chinese), 1997, 42(11): 1190–193.
Li Yanhe, Song Hebin, Li Jincheng, et al., Relationship between polymetallic nodules and submarine hydrothermalism in the Central Pacific Ocean, Chinese Science Bulletin, 1997, 42(23): 1980–1982.
Irving, A. J., Frey, F. A., Trace element abundances in megacrysts and their host basalts: Constraints on megacryst genesis, Geochim. Cosmochim. Acta, 1984, 48: 1201–1221.
Guo Lihe, Lin Xingyuan, Water from the mantle xenoliths in Hannuoba basalt, Hebei, Geological Sinica (in Chinese), 1998, 72(2): 138–143.
Niedermann, S., Bach, W., Erzinger, J., Noble gas evidence for a lower mantle component in MORBs from the southern East Pacific Rise: Decoupling of helium and neon isotope systematics, Geochim. Cosmochim. Acta, 1997, 61(13): 2697–2715.
White, W. M., Sources of oceanic basalts: Radiogenic isotope evidence, Geology, 1985, 13: 115–118.
Hofman, A. W., Chemical differentiation of the Earth: The relationship between mantle, continental crust, and oceanic crust, Earth Planet. Sci. Lett., 1988, 90: 297–314.
Matsumoto, T., Hoda, M., Mcdougall, I., Plume-like neon in metasomatic apatite from the Australian lithospheric mantle, Nature, 1997, 388: 162–164.
Sun, S. S., Mcdonough, W. F., Chemical and isotope systematics of oceanic basalts-—Implications for mantle composition and processes, in Magmatism in the Ocean Basins (eds. Saunders, A. D., Norry, M. J.), Geol. Soc. Lond. Spec. Publ., 1989, 19: 115–157.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Li, Y., Li, J., Song, H. et al. Helium isotope studies of the mantle xenoliths and megacrysts from the Cenozoic basalts in the eastern China. Sci. China Ser. D-Earth Sci. 45, 174–183 (2002). https://doi.org/10.1007/BF02879794
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02879794