Mineral matter and trace elements in coals of the Gunnedah Basin, New South Wales, Australia
Mineral matter and trace elements in coals of the Gunnedah Basin, New South Wales, Australia
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DOI：
10.1016/s0166-5162(99)00006-3
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发表时间：
1999-07
影响因子：
5.6
通讯作者：
C. Ward;D. Spears;C. Booth;I. Staton;L. Gurba
中科院分区：
文献类型：
--
作者：
C. Ward;D. Spears;C. Booth;I. Staton;L. Gurba
主要和微量无机元素的浓度在一系列的二叠纪煤从Gunnedah盆地，新南威尔士州，已被确定的X射线荧光技术应用于全煤和高温灰样品。根据相同煤中矿物的定量数据对结果进行了评估，这些数据是使用基于Rietveld的解释程序（Siroquant™）从全煤样品的X射线衍射研究中确定的，以确定煤中微量元素与存在的矿物种类的关系。定量矿物学研究解释的煤灰化学成分与XRF分析确定的实际煤灰成分的比较显示出高度的一致性，证实了Gunnedah盆地材料XRD解释的有效性。石英，伊利石和其他矿物的碎屑来源占主导地位的煤序列的上部，而自生高岭石是丰富的煤从二叠纪序列的下部。然而，这些矿物的丰度都减少了，黄铁矿是在海洋影响下在几个地层水平形成的煤中的主要成分。方解石和白云岩以割理和裂隙充填物的形式出现，主要分布在层序顶部和底部附近的煤层中。含钾矿物的碎屑部分与显着浓度的铷，和自生高岭石与钛的比例相对较高。在Gunnedah盆地煤层中，锆也很丰富，并伴有P和Hf。Ti、Zr、Nd和Y所表现出的关系与原始沉积物与来自酸性火山源的煤层混合的推导是一致的。煤中的黄铁矿与高浓度的砷和少量的铊有关;没有其他元素通常与煤中的硫化物有关，但是，似乎出现在样品组中的黄铁矿中占显着比例。煤中存在的小浓度的Cl与黄铁矿含量呈负相关，并且似乎代表与有机质相关的离子交换组分。锶和钡与充填割理的碳酸盐矿物密切相关。锗和镓似乎是相互关联的，并与煤的有机质。Cr和V也彼此相关，Ce、La、Nd和Pr也是如此，但这些都没有显示出与有机质或特定矿物组分的任何关系。
The concentrations of major and trace inorganic elements in a succession of Permian coals from the Gunnedah Basin, New South Wales, have been determined by X-ray fluorescence techniques applied to both whole-coal and high-temperature ash samples. The results have been evaluated in the light of quantitative data on the minerals in the same coals, determined from X-ray diffraction study of whole-coal samples using a Rietveld-based interpretation program (Siroquant™), to determine relationships of the trace elements in the coals to the mineral species present. Comparison of the chemical composition of the coal ash interpreted from the quantitative mineralogical study to the actual ash composition determined by XRF analysis shows a high degree of consistency, confirming the validity of the XRD interpretations for the Gunnedah Basin materials. Quartz, illite and other minerals of detrital origin dominate the coals in the upper part of the sequence, whereas authigenic kaolinite is abundant in coals from the lower part of the Permian succession. These minerals are all reduced in abundance, however, and pyrite is a dominant constituent, in coals formed under marine influence at several stratigraphic levels. Calcite and dolomite occur as cleat and fracture infillings, mostly in seams near the top and bottom of the sequence. The potassium-bearing minerals in the detrital fraction are associated with significant concentrations of rubidium, and the authigenic kaolinite with relatively high proportions of titanium. Zirconium is also abundant, with associated P and Hf, in the Gunnedah Basin coal seams. Relationships exhibited by Ti, Zr, Nd and Y are consistent with derivation of the original sediment admixed with the seams from an acid volcanic source. Pyrite in the coals is associated with high concentrations of arsenic and minor proportions of thallium; no other element commonly associated with sulphides in coals, however, appears to occur in significant proportions with the pyrite in the sample suite. Small concentrations of Cl present in the coal are inversely related to the pyrite content, and appear to represent ion-exchange componentsassociated with the organic matter. Strontium and barium are strongly associated with the cleat-filling carbonate minerals. Ge and Ga appear to be related to each other and to the coal's organic matter. Cr and V are also related to each other, as are Ce, La, Nd and Pr, but none of these show any relationship to the organic matter or a particular mineral component.