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地质论评  2006 

成岩混层(I/S)Ar―Ar年龄谱型及^39Ar核反冲丢失机理研究――以浙江长兴地区P―T界线粘土岩为例

Keywords: 成岩混层I/SK―Ar测年Ar―Ar测年Ar―Ar年龄谱型核反冲丢失机理

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Abstract:

本文以浙江长兴地区P―T界线上的粘土岩为研究对象,对其中的成岩混层I/S进行了K―Ar和Ar―Ar测年实验研究,结果表明,沉积岩中成岩混层I/S的K―Ar年龄在没有碎屑含钾矿物混入的情况下,比其对应的地层时代要年轻。成岩混层I/S的常规^40Ar/^39Ar阶段升温测年一般情况下得不到年龄坪,只有当类蒙皂石层的含量为零时(即没有膨胀层的成岩伊利石),才能形成平坦的年龄谱。^39Ar的核反冲丢失不仅发生在矿物表面,也发生在矿物内部,最高可达48%左右,0.2μm粒级可能是^39Ar核反冲丢失量的拐点,同时也表明,用快中子照射硅酸盐样品,核反冲距离可以达到0.2μm。

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