The rock samples of the Permo-Carboniferous system in Hebi Area were collected and an ICP-MS method was used to analyze the rare earth elements of the samples systematically.
采集了鹤壁地区石炭-二叠系岩石样品，采用电感耦合等离子质谱技术对样品进行了系统的稀土元素测试分析。
Fractal theory was used in this paper, and fractal feature of grain distribution of sandstone in coal-bearing strata in Permo Carboniferous System was studied.
应用分形的思路和方法研究了石炭-二叠系含煤地层砂岩粒度分布的分形特征。
Fractal theory was used in this paper, and fractal feature of grain distribution of sandstone in coal-bearing strata in Permo Carboniferous System was studied.
应用分形的思路和方法研究了石炭-二叠系含煤地层砂岩粒度分布的分形特征。
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