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

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Science china Earth Sciences 2006年第10期49卷 1032-1042页

作者： peng touping1,2. wang yuejun1,{2., liu dunyi3. shi yuruo3.& miao laicheng4 1. key laboratory of isotope geochronology and geochemistry, guangzhou institute of geochemistry, chinese academy of Sciences, guangzhou 510640, china 2. Graduate University of chinese academy of Sciences, Beijing 100039, china 3. SHRIMP {12. laboratory, chinese academy of Geological Sciences, Beijing 100037, china 4. institute of Geology and Geophysics, chinese academy of Sciences, Beijing 10002., china key {1. of {2. geochronology and geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Graduate University of chinese {1. of Sciences Beijing China SHRIMP isotope {1. Chinese Academy of Geological Sciences Beijing China institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

The SHRIMP zircon U-Pb geochronology of three typical samples, including two monzo nitic 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 (0{1.X-1.7) and southern ({1.JH-1.) Lincang batholith show the single and tight clusters on the concordia, and yield the weighted mean {1.6Pb/{1.8U ages of {1.9.4 ± 3.0 Ma and {1.0.4 ± 3.6 Ma, respectively, representing the crystallized ages of these granites. The zircons for the rhyolitic sample (0{1.X-95) from the Manghuai Formation give a weighted mean {1.6Pb/{1.8U age of {1.1.0 ± 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 (~{1.0 Ma) and were originated from the postcollisional tectonic regime. An early Proterozoic {1.6Pb/{1.8U apparent age of 1.77±44 Ma is additionally obtained from one zircon from the biotite monzonitic granite (southern Lincang batholith), indicative of devel- opment 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.

关键词： SHRIMP zircon U-Pb dating, Middle Triassic, Lincang granitic batholith, Manghuai Formation rhyolite, southern Lancangjiang.

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