| Helium and Argon Isotopes of the Tertiary Volcanic Rocks, Shandong Peninsula：Significance for Crust-Mantle Circulation |
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| 作者姓名： | Tang Huayun State Key Lab of Geological Processes and Mineral Resources China University of Geosciences Wuhan China Faculty of Earth Sciences China University of Geosciences Wuhan China Yu Chunmei Faculty of Earth Sciences China University of Geosciences Wuhan China |
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| 作者单位： | Tang Huayun State Key Lab of Geological Processes and Mineral Resources，China University of Geosciences，Wuhan 430074，China;Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074，China Yu Chunmei Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074，China |
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| 基金项目： | 中国地质大学(武汉)科研和教改项目 |
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| 摘 要： | Noble gases have successfully been used to con strain the mantle structure (Allegre et al., 1983),discuss mantle heterogeneity (Ma and Tao, 2002),determine different mantle source components and soon, because of their chemical inertia and isotopicfractionation during the evolution of the earth. Het erogeneities of the subcontinental mantle beneatheastern China have been confirmed by abundant stud ies of mantle magmas and xenoliths, in mineralogy,petrology and isotop…
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| 关 键 词： | 氦 氩 同位素 第三纪 火山岩 山东 地壳-地幔循环 |
Helium and Argon Isotopes of the Tertiary Volcanic Rocks, Shandong Peninsula Significance for Crust-Mantle Circulation |
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| Tang Huayun State Key Lab of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan ,China,Faculty of Earth Sciences,China University of Geosciences,Wuhan ,China Yu Chunmei Faculty of Earth Sciences,China University of Geosciences,Wuhan ,China.Helium and Argon Isotopes of the Tertiary Volcanic Rocks, Shandong Peninsula Significance for Crust-Mantle Circulation[J].Journal of China University of Geosciences,2005,16(1):24-28. |
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| Authors: | TANG Huayun YU ChunMei |
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| Abstract: | He and Ar isotopes of the Tertiary volcanic rocks from Jiyang basin and nearby Shanwang and Qixia areas in Shandong peninsula have been analyzed. The results show that all samples are characterized by an enrichment of radiogenic 4He leading to extremely low 3He/4He ratios (0.017 8-3.225)×10-6. They also have atmospheric-like 38Ar/36Ar ratios and slightly higher 40Ar/36Ar ratios (395.4-1 312.7) than air value. The enrichment of radioactive 4He is attributed to the long-term radiogenic accumulation of U and Th in the mantle. The low concentration of 3He is considered to be due to 3He loss during magma eruption. The loss is more obvious in the Neogene than in the Paleogene. Low 40Ar/36Ar ratios of all volcanic rocks may imply that subducted materials with atmospheric components have been preserved in the mantle, thus indicating that crust-mantle circulation occurred. |
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| Keywords: | He-Ar isotope Tertiary volcanic rocks Shandong peninsula crust-mantle circulation |
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