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Isotope geochronology of Dapingzhang spilite-keratophyre formation in Yunnan Province and its geological significance

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Abstract

On the basis of the geological field investigations and isotope geochronological studies the Sm-Nd isochron age (513 Ma±40 Ma), Rb-Sr isochron age (511 Ma±8 Ma) and K-Ar age (312-317 Ma) of the Dapingzhang spilite-keratophyre formation in Yunnan Province are presented. From these geochronological data it is evidenced that this suite of volcanic rocks was formed in the Cambrian and the parent magma was derived from a depleted mantle, which was influenced by crustal contamination and/or seawater hydrothermal alteration. During the Late Carboniferous the volcanic rocks experienced relatively strong geological reworking. This study provides geochronological evidence for the occurrence of Cambrian volcanic rocks in the Sanjiang (three-river) area.

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Authors and Affiliations

  1. Institute of Geochemistry, Chinese Academy of Sciences, 550002, Guiyang, China

    Hong Zhong, Ruizhong Hu, Zaojun Ye & Guangzhi Tu

  2. Institute of Geology, Chinese Academy of Sciences, 100029, Beijing, China

    Hong Zhong

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  1. Hong Zhong
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  2. Ruizhong Hu
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  3. Zaojun Ye
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  4. Guangzhi Tu
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Correspondence to Hong Zhong.

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Zhong, H., Hu, R., Ye, Z. et al. Isotope geochronology of Dapingzhang spilite-keratophyre formation in Yunnan Province and its geological significance. Sci. China Ser. D-Earth Sci. 43, 200–207 (2000). https://doi.org/10.1007/BF02878150

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  • DOI: https://doi.org/10.1007/BF02878150

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