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金沙江-红河构造带北段囊谦盆地新生代高钾岩石40Ar/39Ar年代学研究

, PP. 241-247

Keywords: 新生代高钾岩石,Ar/Ar年代学,金沙江-红河构造带,囊谦盆地

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Abstract:

9个黑云母样品高精度40Ar/39Ar法定年结果表明,囊谦盆地高钾岩浆的活动年限为37.1~37.8Ma。高钾岩石在地质背景和岩石类型上与青藏东缘发现的两类高钾岩系中的早期高钾岩浆岩具有可比性,它们可能形成于相同的构造背景。结合前人的同位素年代学研究资料,金沙江-红河构造带南、北段高钾岩浆活动的时间分别为40~24Ma和40~33Ma,南、北段高钾岩浆活动时间的差异可能指示陆内俯冲作用时限的差异。

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