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SHRIMP ziron U-Pb geochronology of early Mesozoic felsic igneous rocks from the southern Lancangjiang and its tectonic implications

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Abstract

The SHRIMP zircon U-Pb geochronology of three typical samples, including two monzonitic granites from the Lincang batholith and a rhyolite from the Manghuai Formation are presented in the southern Lancangjiang, western Yunnan Province. The analyses of zircons for the biotite monzonitic granites from the northern (02DX-137) and southern (20JH-10) Lincang batholith show the single and tight clusters on the concordia, and yield the weighted mean 206Pb/238U ages of 229.4 ± 3.0 Ma and 230.4 ± 3.6 Ma, respectively, representing the crystallized ages of these granites. The zircons for the rhyolitic sample (02DX-95) from the Manghuai Formation give a weighted mean 206Pb/238U age of 231.0 ± 5.0 Ma. These data suggest that the igneous rocks from the Lincang granitic batholith and Manghuai Formation have a similar crystallized age. In combination with other data, it is inferred that both were generated at a narrow age span (∼230 Ma) and were originated from the postcollisional tectonic regime. An early Proterozoic 206Pb/238U apparent age of 1977±44 Ma is additionally obtained from one zircon from the biotite monzonitic granite (southern Lincang batholith), indicative of development of the early Proterozoic Yangtze basement in the region. These precisely geochronological data provide important constraints on better understanding the Paleozoic tectonic evolution of the Tethys, western Yunnan Province.

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Authors and Affiliations

  1. Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Peng Touping, Wang Yuejun & Fan Weiming

  2. Graduate University of Chinese Academy of Sciences, Beijing, 100039, China

    Peng Touping

  3. SHRIMP isotope Laboratory, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Liu Dunyi & Shi Yuruo

  4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Miao Laicheng

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  1. Peng Touping
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  2. Wang Yuejun
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  3. Fan Weiming
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  4. Liu Dunyi
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  5. Shi Yuruo
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  6. Miao Laicheng
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Correspondence to Wang Yuejun.

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Peng, T., Wang, Y., Fan, W. et al. SHRIMP ziron U-Pb geochronology of early Mesozoic felsic igneous rocks from the southern Lancangjiang and its tectonic implications. SCI CHINA SER D 49, 1032–1042 (2006). https://doi.org/10.1007/s11430-006-1032-y

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  • DOI: https://doi.org/10.1007/s11430-006-1032-y

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