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科学通报  2011 

锡石40Ar/39Ar法直接定年探讨

DOI: 10.1360/972011-43, PP. 1899-1904

Keywords: 锡石,流体包裹体,40Ar/39Ar,,白云母,漂塘钨矿

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Abstract:

赣南漂塘钨矿共生白云母和锡石40Ar/39Ar定年对比研究,前者采用激光阶段加热分析,后者采用真空击碎法提取流体包裹体.白云母形成平坦的年龄谱,坪年龄为159.3±1.5Ma(2σ).锡石形成下降型年龄谱,最初6个阶段表观年龄明显偏老且迅速下降,从3954Ma降至196Ma,表明锡石中次生包裹体含有过剩氩;第7~18阶段形成了年龄坪,坪年龄为159.1±1.8Ma,对应的数据点构成高度线性相关的等时线,等时年龄为158.6±2.9Ma,代表了原生包裹体的年龄.锡石原生包裹体年龄与白云母年龄一致,代表了漂塘钨矿的形成年龄.研究结果表明锡石是40Ar/39Ar真空击碎分析理想的定年对象,其原生包裹体年龄代表了成矿年龄.继闪锌矿之后,再次拓展了流体包裹体40Ar/39Ar法应用于矿石矿物直接定年测试对象.

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