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He and Ar isotope geochemistry of pyroxene megacrysts and mantle xenoliths in Cenozoic basalt from the Changle–Linqu area in western Shandong

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  • Geochemistry
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Chinese Science Bulletin

Abstract

We performed a combined study of He–Ar isotopes and element geochemistry for pyroxene megacrysts and mantle xenoliths from Cenozoic basalt in the Changle–Linqu area in western Shandong. The results are used to trace the evolution of subcontinental lithospheric mantle after destruction of the North China Craton. The 3He/4He ratios of pyroxene megacrysts, websterite, and dunites are 7.0–7.7 Ra, 7.4 Ra, and 7.0–7.7 Ra, respectively. They are related to the origin of host basalts, and are slightly lower than that of mid-ocean ridge basalts (MORB). Their 40Ar/36Ar ratios are much lower than that of MORB and close to that of air. The lherzolites and wehrlites represent the fragments of the newly accreted lithospheric mantle, and their REE and trace elements indicate that they experienced melt metasomatism and partial melting. The 3He/4He ratios of their olivine are slightly lower than that of MORB, but 3He/4He ratios of their clinopyroxene are low (2.3–7.1 Ra) and display an inverse correlation with (La/Yb)N. The 40Ar/36Ar ratios of these clinopyroxene are much lower than that of MORB and close to the air ratio. Combining existing studies of petrology, Sr–Nd–Pb isotopes, O isotopes, trace elements, and Mg isotopes, we infer that the juvenile lithospheric mantle in the Changle–Linqu area was metasomatized by oceanic crust-derived melts, which transfer the supracrustal Ar isotope signatures to the mantle sources. The low 4He abundance and low 3He/4He ratios of clinopyroxene in the lherzolites and wehrlites are ascribed to metasomatism by crustal melts from the subducted Pacific plate.

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Acknowledgments

The authors thank Prof. Yong Fei Zheng, Hong Fu Zhang, Jian Ping Zheng, and Chuan Zhou Liu for their constructive suggestions which have significantly improved the manuscript. This work was supported by the National Basic Research Program of China (2009CB825001) and the National Natural Science Foundation of China (90714010).

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Authors and Affiliations

  1. Key Laboratory of the Earth’s Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Fei Su, Huaiyu He & Ying Wang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Fei Su & Ying Wang

  3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Yan Xiao, Benxun Su & Rixiang Zhu

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  1. Fei Su
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Correspondence to Huaiyu He.

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Su, F., Xiao, Y., He, H. et al. He and Ar isotope geochemistry of pyroxene megacrysts and mantle xenoliths in Cenozoic basalt from the Changle–Linqu area in western Shandong. Chin. Sci. Bull. 59, 396–411 (2014). https://doi.org/10.1007/s11434-013-0027-2

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