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引言辐射年龄测定是现代地质学的基本工具之一。对于距今大约三万至四十万年的期间,不是缺乏年龄的测定方法,就是缺乏可以用于测定年龄的物质。铀系不平衡法是可以应用在这个时间范围内的少数几个年龄测定方法中的一个。自从这个方法在大约二十年前提出以来,它非常成功地应用于纯碳酸盐沉淀物。但是把它应用到带有碎屑杂质的钙质物质上的尝试还几乎没有做过。普遍存在于半干旱和干旱区域的土壤碳酸盐(作为例子)的年龄测定,假若
Introduction Radiation age determination is one of the basic tools of modern geology. For a period of about 30,000 to 400,000 years ago, it is not a measure of lack of age, or a substance lacking in age determinable. The uranium imbalance method is one of the few age determination methods that can be applied within this time frame. Since this method was proposed about twenty years ago, it has been very successfully applied to pure carbonate sediments. Attempts to apply it to calcareous material with detritus have scarcely been done. Age determinations of soil carbonates (by way of example) prevailing in semi-arid and arid areas, if