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斯瓦尔巴群岛的Janusfjellet建造厚700—800 m,主要由黑色碳质页岩组成。通过1616个样品的分析得出建造中页岩和砂岩的平均含量(见表),表明从砂岩、粉砂岩到粘土岩含量随岩石粒度的减小而增加。黑色页岩主要由绿泥石、伊利石、蒙脱石-伊利石混层粘土组成,还含有一些高岭石、石英、长石和少量方解石、白云母、绢云母,有机质含量为0.8—4.7％。放射性系列对总的γ放射性的贡献U为8—20％(平均18％),Th为38—66％(平均46％),K为25—51％(平均36％)。Janusfjellet建造黑色页岩的U含量与粘土岩/页岩的平均U含量相当,而Th和K_2O含量略高于已发表的平均值,这就
The Janusfjellet of Svalbard is 700-800 m thick and consists mainly of black carbonaceous shale. Analyzing the average of shale and sandstone from the analysis of 1616 samples (see table), it shows that the contents of sandstone, siltstone and claystone increase with the decrease of rock particle size. Black shale is mainly composed of chlorite, illite, montmorillonite - illite mixed clay, and also contains some kaolinite, quartz, feldspar and a small amount of calcite, muscovite, sericite, organic matter content of 0.8-4.7% . The contribution of the radioactive series to total gamma radioactivity was 8-20% (average 18%), Th 38-66% (average 46%), and K 25-51% (average 36%). The U content of the Janusfjellet-constructed black shale is comparable to the average U content of claystone / shale, while the Th and K_2O contents are slightly higher than published averages