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为研究云南临沧勐托新近系褐煤的微量元素地球化学特征,共采集了11个褐煤样品,采用ICP-MS和ICP-CCT-MS(As和Se)对煤中微量元素进行了测试。结果表明:与中国煤相比,勐托褐煤中Rb(96.1mg/kg)、Sb(15.3mg/kg)和Cs(25.9mg/kg)显著富集,W(10.6 mg/kg)和U(20.2 mg/kg)富集,Be(7.84 mg/kg)、Ga(16.1mg/kg)、As(11.6mg/kg)、Cd(0.67mg/kg)、Sn(6.66mg/kg)、Pb(34.6mg/kg)、Bi(3.86mg/kg)和Th(28.2mg/kg)稍富集,微量元素组成与大寨富锗煤不同,与酸性花岗岩物源供应有关。勐托褐煤中REY含量范围为121~420mg/kg,平均251mg/kg,均较大寨富锗褐煤高,且以Ce显著正异常和Eu显著负异常为特征,明显区别于大寨褐煤,Eu负异常和上陆壳标准化的REY分配模式均表明勐托褐煤中稀土元素受盆地周边花岗岩风化陆源碎屑供应影响。
In order to study the trace element geochemical characteristics of a new type of brown coal in Mengtuo, Lincang, a total of 11 brown coal samples were collected and the trace elements in coal were tested by ICP-MS and ICP-CCT-MS (As and Se). The results showed that Rb (96.1 mg / kg), Sb (15.3 mg / kg) and Cs (25.9 mg / kg) Be (7.84 mg / kg), Ga (16.1 mg / kg), As (11.6 mg / kg), Cd (0.67 mg / kg), Sn 34.6 mg / kg), Bi (3.86 mg / kg) and Th (28.2 mg / kg). The trace element composition is different from that of Dazhai Fu Ge coal and is related to the source of acidic granite. The content of REY in Mengtuo lignite ranged from 121 to 420 mg / kg with an average of 251 mg / kg, which was higher than that of Dazhai-rich germanium lignite and characterized by significant positive Ce anomalies and significant negative Eu anomalies, which were obviously different from that of Dazhai lignite, Eu Both the negative anomalies and the normalized REY distribution patterns of the upper continental crust indicate that the rare earth elements in the Mengtuo lignite are affected by the supply of weathered terrigenous debris from the granites surrounding the basin.