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LA-ICP-MS zircon U-Pb age of gneiss from Gaoligong Mountain Group on the southeastern margin of Tengchong block in western Yunnan Province
Pages: 258-263
Year: Issue:  Z1
Journal: Regional Geology of China

Keyword:  滇西 腾冲地块 片麻岩 深熔作用 IA-ICP-MS锆石U-Pb年龄;
Abstract: 分布于腾冲地块东南缘的高黎贡山群片麻岩经历了多期变质作用,深熔和糜棱岩化作用表现得十分明显,片麻岩中的锆石具有深熔锆石的特征。在取得的15个锆石年龄数据中,14个数据的206Pb/238U年龄为454.4~546.7Ma,平均年龄为489Ma±16Ma,仅1个数据为261.9Ma。测试结果表明,腾冲地块东南缘的高黎贡山群岩石在早古生代遭受强烈的区域变质作用(包括混合岩化),而这正是泛非事件在腾冲地块上的反映。
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