Selenium and tellurium concentrations of Carboniferous British coals
Selenium and tellurium concentrations of Carboniferous British coals
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DOI：
10.1002/gj.3238
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发表时间：
2019-05-01
影响因子：
1.8
通讯作者：
Flores, Erico M. M.
中科院分区：
文献类型：
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作者：
Bullock, Liam A.;Parnell, John;Flores, Erico M. M.
为了克服光谱干扰，首次利用标准模式和碰撞/反应细胞质谱方法对英国石炭系煤中的硒（Se）和碲（Te）进行了超低定量分析。随着煤和黄铁矿被确定为潜在的重要微量元素来源，煤中硒和碲的准确检测变得越来越重要。英国煤的平均硒浓度与世界煤比较，在西风暴露中，硒含量异常（浓度高于4毫克/公斤），通常与高硫(S)含量和可见的黄铁矿相一致。英国煤的最新Te数据显示，Te的平均浓度为0.02mg/kg，其中艾尔郡的Te异常。在整个样本集中，Te/Se比率呈正相关。Se和Te之间的密切关系，以及Se-Te与早期同生和后期填空黄铁矿的密切关系，证实了硫化物在英国煤中Se和Te的固存中起重要作用。高Se-Bowland页岩和/或奥陶系火山岩可能为类似或更年轻的英国煤提供了微量元素来源。区域侵入活动（浅板状侵入或更广泛的岩体）和强烈变形的发生改变了煤的热成熟度，并可能推动了富微量元素流体穿过地层的运动，局部富集了煤中的Se和Te。
Standard mode and collision/reaction cell mass spectroscopy methods have been utilized in order to overcome spectral interferences and provide ultra-low quantification of selenium (Se) and tellurium (Te) in British Carboniferous coals for the first time. The accurate detection of Se and Te in coals is becoming increasingly important, as coals and pyrite have been identified as potentially significant trace element sources. The mean Se concentration of British coals bear comparison to that of world coals, with anomalous Se content (concentrations above 4mg/kg) across westerly exposures, often coinciding with high sulphur (S) content and visible pyrite. New Te data for British coals gives a mean concentration of 0.02mg/kg, with anomalous Te in Ayrshire. There is a positive correlation in the Te/Se ratio across the sample set. The close relationship between Se and Te, as well as Se-Te with both early syngenetic and later cleat-filling pyrite, confirms an important role for sulphides in Se and Te sequestration in British coals. The high Se-Bowland Shale and/or Ordovician volcanics may have provided the trace element source for British coals of similar or younger age. Regional intrusive activity (shallow tabular intrusions or more extensive plutons) and episodes of intense deformation can alter the thermal maturity of coals and may have driven the movement of trace element-rich fluids through strata, locally enriching coals in Se and Te.