| Sr,Nd,Pb Isotope Geochemistry and Magma Evolution of the Potassic Volcanic Rocks,Wudalianchi,Northeast China |
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| 作者姓名： | 王俊文 M.TATSUMOTO 等 |
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| 作者单位： | [1]InstituteofGeochemistry,AcademiaSinica,Guiyang [2]DepartmentofGeologicalSciences,UniversityofRochester,R |
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| 摘 要： | Wudalianchi volcanic rocks are the most typical Cenozoic potassic volcanic rocks in easten China.Compositional comparisons between whole rocks and glasses of various occurrences indicate that the magma tends to become rich in silica and alkalis as a result of crystal differentiation in the course of evolu-tion.They are unique in isotopic composition with more radiogenic Sr but less radiogenic Pb.^87Sr/^86Sr is higher and ^143Nd/^144Nd is lower than the undifferentiated global values.In comparison to continental pot-ash volcanic rocks,Pb isotopes are apparently lower.These various threads of evidence indicate that the rocks were derived from a primary enriched mantle which had not been subjected to reworking and shows no sign of incorporation of crustal material.The correlation between Pb and Sr suggests the regional heterogeneity in the upper mantle in terms of chemical composition.
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| 关 键 词： | 锶同位素 铅同位素 钕同位素 地球化学 岩浆 火山岩 中国东北地区 |
Sr,Nd, Pb Isotope geochemistry and magma evolution of the potassic volcanic rocks,Wudalianchi, Northeast China |
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| Wang Junwen,Xie Guanghong,M. Tatsumoto,A. R. Basu.Sr,Nd,Pb Isotope Geochemistry and Magma Evolution of the Potassic Volcanic Rocks,Wudalianchi,Northeast China[J].Chinese Journal of Geochemistry,1989,8(4):322-330. |
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| Authors: | Wang Junwen Xie Guanghong M Tatsumoto A R Basu |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, Guiyang;(2) U.S. Geological Survey, Denver, Colorado, USA;(3) Department of Geological Sciences, University of Rochester, Rochester, NY, USA |
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| Abstract: | Wudalianchi volcanic rocks are the most typical Cenozoic potassic volcanic rocks in eastern China. Compositional comparisons
between whole rocks and glasses of various occurrences indicate that the magma tends to become rich in silica and alkalis
as a result of crystal differentiation in the course of evolution. They are unique in isotopic composition with more radiogenic
Sr but less radiogenic Pb.87Sr /86 Sr is higher and143Nd/144Nd is lower than the undifferentiated global values. In comparison to continental potash volcanic rocks, Pb isotopes are apparently
lower. These various threads of evidence indicate that the rocks were derived from a primary enriched mantle which had not
been subjected to reworking and shows no sign of incorporation of crustal material. The correlation between Pb and Sr suggests
the regional heterogeneity in the upper mantle in terms of chemical composition. |
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