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矿床地质  2002 

安徽凤阳和张八岭地区含金石英脉的40Ar/39Ar年龄及其地质意义

Keywords: 成矿时代,石英,40Ar/39Ar年龄,金矿床,安徽

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Abstract:

用快中子活化法测定了安徽凤阳和张八岭地区朱顶、毛山和上成3个金矿床第一阶段晚期和第二阶段的含金石英脉,石英的阶段加热40Ar/39Ar坪年龄值域为(116.1±0.6~118.3±0.5)Ma,分别与其最小视年龄和等时线年龄接近。坪年龄、最小视年龄和等时线年龄3种年龄值域为(113.4±0.4~118.3±0.5)Ma,可以作为石英的形成年龄域。根据含金石英脉和围岩的空间关系,该年龄值域作为石英脉金矿的形成年龄是合理可靠的。金矿床形成于早白垩世阿普特期,与此时郯庐断裂带略带右行走滑正断层活动一致。

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