| Sr-Nd-Pb isotopes of the Early Paleozoic maficultramafic dykes and basalts from South Qinling belt and their implications for mantle composition |
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| 作者单位： | ZHANG ChengLi（State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Geological Progresses and Mineral Resources, China University of Geosciences, Wuhan 430074, China） ;
GAO Shan（State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Geological Progresses and Mineral Resources, China University of Geosciences, Wuhan 430074, China） ;
YUAN HongLin（State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China） ;
ZHANG GuoWei（State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China） ;
YAN YunXiang（State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China） ;
LUO JingLan（State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China） ;
LUO JinHai（State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China） ; |
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| 基金项目： | 国家自然科学基金;教育部科学技术研究项目 |
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| 摘 要： | Late Early Paleozoic mafic-ultramafic dykes and volcanic rocks from the South Qinling belt are char- acterized by εNd( t ) = 3.28― 5.02, (87Sr/86Sr)i= 0.70341― 0.70555, (206Pb/204Pb)i = 17.256― 18.993, (207Pb/204Pb)i= 15.505―15.642, (208Pb/204Pb)i=37.125―38.968, ?8/4=21.18―774.43, ?7/4=8.11―18.82. These charac- teristics suggest that they derived from a Middle Neoproterozoic mantle with isotopic compositions of mixed HIMU, EMII and minor EMI components. We interpret that these rocks were melting products of depleted mantle modified by subducted ancient oceanic crust and continental margin sediments along the northern margin of Yangtze block during Early Neoproterozoic.
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| 收稿时间： | 22 January 2007 |
| 修稿时间： | 11 April 2007 |
Sr-Nd-Pb isotopes of the Early Paleozoic mafic-ultramafic dykes and basalts from South Qinling belt and their implications for mantle composition |
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| Authors: | Zhang ChengLi Gao Shan Yuan HongLin Zhang GuoWei Yan YunXiang Luo JingLan Luo JinHai |
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| Institution: | 1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Geological Progresses and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China |
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| Abstract: | Late Early Paleozoic mafic-ultramafic dykes and volcanic rocks from the South Qinling belt are characterized by ɛNd(t) = +3.28 − +5.02, (87Sr/86Sr)i = 0.70341 − 0.70555, (206Pb/204Pb)i = 17.256 − 18.993, (207Pb/204Pb)i = 15.505 − 15.642, (208Pb/204Pb)i = 37.125 − 38.968, Δ8/4=21.18 − 774.43, Δ7/4 = 8.11 − 18.82. These charac-teristics suggest that they derived from a Middle
Neoproterozoic mantle with isotopic compositions of mixed HIMU, EMII and minor EMI components. We interpret that these rocks
were melting products of depleted mantle modified by subducted ancient oceanic crust and continental margin sediments along
the northern margin of Yangtze block during Early Neoproterozoic.
Supported jointly by the National Natural Science Foundation of China (Grant Nos. 40372039, 40521001), Ministry of Education
of China (Grant Nos. IRT0441 and B07039) and the State Key Laboratory of Geological Progresses and Mineral Resources (Grant
No. MGMR2002-27) |
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| Keywords: | mafic dykes and basalts from South Qinling belt |
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