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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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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.

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Authors and Affiliations

  1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, 710069, China

    Zhang ChengLi, Gao Shan, Yuan HongLin, Zhang GuoWei, Yan YunXiang, Luo JingLan & Luo JinHai

  2. State Key Laboratory of Geological Progresses and Mineral Resources, China University of Geosciences, Wuhan, 430074, China

    Zhang ChengLi & Gao Shan

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Correspondence to Zhang ChengLi.

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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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Zhang, C., Gao, S., Yuan, H. et al. Sr-Nd-Pb isotopes of the Early Paleozoic mafic-ultramafic dykes and basalts from South Qinling belt and their implications for mantle composition. SCI CHINA SER D 50, 1293–1301 (2007). https://doi.org/10.1007/s11430-007-0088-7

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  • DOI: https://doi.org/10.1007/s11430-007-0088-7

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