Excess Rare Gases in a Subaerial Basalt from Nigeria
Excess Rare Gases in a Subaerial Basalt from Nigeria
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尼日利亚地下玄武岩中含有过量稀有气体
DOI：
10.1038/physci232060a0
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发表时间：
1971
期刊：
影响因子：
64.8
通讯作者：
D. E. Fisher
中科院分区：
文献类型：
--
作者：
D. E. Fisher
尼日利亚碱性玄武岩含有大斜长石斑晶1,2，由Benue海槽省众多第三纪-第四纪塞之一组成，是一种细粒的陆上岩石，似乎适合于整个岩石的K-Ar定年。然而，得到的年龄是95年（表1），这在地质学上是不现实的，因为没有沉积物覆盖，岩石的新鲜度和伴随岩石的年龄都指向第三纪晚期的起源。
A Nigerian alkaline basalt containing large phenocrysts of plagioclase feldspars1,2and comprising one of the numerous Tertiary-Quaternary plugs of the Benue Trough province is a fine grained, subaerial rock which seems to be suitable for whole rock K-Ar dating. The age obtained, however, 95 m.y. (Table 1), is geologically unrealistic, for absence of sediment cover, the freshness of the rock and the ages of associated rocks all point to a late Tertiary origin2.