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引言研究太古宙碎屑沉积物的成因,主要限于砾岩的卵石和硬砂岩的岩石碎屑。研究这种碎屑是揭示这些碎屑沉积物的源区内长英质火山岩的重要性。从太古宙硬砂岩中富集的主要元素,可说明其源区地质体的平均总成分介于英云闪长岩和花岗闪长岩之间。与岩石碎屑分布一道Condie等人用连同K_2O-Na_2O分布情况,检验硬砂岩的来源,图1说明太古宙四组硬砂岩,从沙巴组到怀俄明硬砂岩,其K_2O-Na_2O两者增加趋势反映出花岗质岩屑(富K_2O)含量的增加,而镁铁质和中性火山岩则减少。卡尔古利(澳大利亚)
Introduction Research into the causes of Archean clastic sediments is mainly confined to conglomerate pebbles and hard rock rock fragments. The study of this debris is important to reveal the felsic volcanic rocks in the source area of these clastic sediments. The main elements enriched from the Archean hard sandstone indicate that the average total composition of the geologic bodies in the source area lies between that of the diorite and the granodiorite. Condie et al., Together with the distribution of rock debris, examined the source of hard sandstone along with the distribution of K2O-Na2O. Figure 1 shows that the four Archean hard sandstones, from the Sabah Formation to the Wyoming hard sandstone, reflect an increasing trend of both K2O-Na2O The increase of granitic cuttings (K 2 O) content, while the decrease of mafic and neutral volcanic rocks. Kalgoorlie (Australia)