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地质学报  2004 

大别造山带东部假玄武玻璃及其围岩的K-Ar和^40Ar-^39Ar年龄及地质意义

Keywords: 大别造山带假玄武玻璃,40Ar/,39Ar年龄板快碰撞

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Abstract:

发育在大别造山带东部的假玄武玻璃是区域内NE-SW向断裂带快速滑移形成的构造岩。地质产状、显微构造及岩石化学研究表明,这些假玄武玻璃主要由超碎裂岩化作用所形成。假玄武玻璃及围岩的全岩(包括部分单矿物)K-Ar年龄测定表明,大别造山带的假玄武玻璃形成于81~93Ma之间。本文同时测定了叠加在假玄武玻璃基质之上的多硅白云母的激光^40Ar/^39Ar年龄为78.9Ma。显微构造及所获得的年龄数据显示,这些沿NE-SW向断裂发育的假玄武玻璃是在晚白垩世(80~90Ma)时期伴随着大别造山带整体隆升过程形成的,而与早期板块俯冲过程无关。同时,不同定年方法在数据上的一致性还表明,全岩K-Ar方法在确定某些假玄武玻璃及含假玄武玻璃的断裂构造年代时,可能仍然是一种行之有效的的方法。

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