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Geochronology of Ailaoshan-Jinshajiang alkalirich intrusive rocks and their Sr and Nd isotopic characteristics

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Abstract

Twenty-nine isotopic ages, ranging from 41 to 27 Ma, are presented for the alkali-rich intrusive rocks and their coexisting alkaline volcanic rocks, lamprophyres and acidic porphyries, indicating that they are Tertiary in age. The alkali-rich intrusive rocks have143Nd/144Nd ratios from 0. 512 415 to 0. 512 544, and87Sr/86Sr ratios from 0.705 4 to 0.706 8, suggesting that their material originates from an enriched mantle source.

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Authors and Affiliations

  1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou, China

    Yuquan Zhang & Yingwen Xie

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  1. Yuquan Zhang
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  2. Yingwen Xie
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Project supported by the National Natural Science Foundation of China and the Special Grant of the President of Chinese Academy of Sciences.

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Zhang, Y., Xie, Y. Geochronology of Ailaoshan-Jinshajiang alkalirich intrusive rocks and their Sr and Nd isotopic characteristics. Sci. China Ser. D-Earth Sci. 40, 524–529 (1997). https://doi.org/10.1007/BF02877619

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  • DOI: https://doi.org/10.1007/BF02877619

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