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LA-ICP-MS U-Pb zircon dating of the Bozhushan granite in Southeast Yunnan

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Abstract

The LA-ICP-MS U-Pb zircon dating of eight typical samples from four units of the Bozhushan granite intrusion in southeastern Yunnan Province, constrains the age of acidic magmatic intrusion in this area. Both the oscillatory zoning and chondrite-normalized REE patterns characterized by LREE-depletion and HREE-enrichment with positive Ce anomaly and negative Eu anomaly indicate the magmatic genesis of these zircons. Eight zircon samples from the Bozhushan granite yielded a mean 206Pb/238U age of (85.58±1.0) Ma (MSWD=4.1) to (88.10±0.66) Ma (MSWD=1.8). These chronology data suggest an accurate isotopic age for the intrusion of the Bozhushan granite, and are different from the published age data of 48 to 111.5 Ma. The geochronology data of the Gejiu, Dulong and Dachang super-large deposits and related Yanshanian granites indicated that there occurred large-scale granitic magmatism and mineralization events in western Nanling region during the Late Cretaceous.

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Authors and Affiliations

  1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China

    Kaiwen Li, Qian Zhang, Dapeng Wang, Yi Cai & Yuping Liu

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

    Kaiwen Li & Yi Cai

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  1. Kaiwen Li
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  2. Qian Zhang
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  3. Dapeng Wang
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  4. Yi Cai
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  5. Yuping Liu
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Correspondence to Qian Zhang.

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Li, K., Zhang, Q., Wang, D. et al. LA-ICP-MS U-Pb zircon dating of the Bozhushan granite in Southeast Yunnan. Chin. J. Geochem. 32, 170–180 (2013). https://doi.org/10.1007/s11631-013-0619-1

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  • DOI: https://doi.org/10.1007/s11631-013-0619-1

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