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Micro-PIXE Analysis of Trace Elements in Sulfides

机译:Micro-PIXE分析硫化物中的痕量元素

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Micro-scale Proton-induced X-ray Emission (PIXE) of trace elements (TE) in sulfides provides insights into geologic processes including magmatic system evolution, ore forming events, and fluid-flow processes. The Los Alamos nuclear microprobe was used to determine TE concentrations and ratios in sulfides from diverse geologic environments including hydrothermal ore deposits, coal seams, and metamorphic rocks. Pyrrhotite (Po) from silicic volcanics contains high Cu and Ni; Po from the Clear Lake volcanic field has higher Mo than does Po from other volcanic fields. Coal pyrites contain high Cu, As, Se, Mo and Pb, and show high As/Se and Mo/Se in marine influenced sulfides from the Lower Kittanning coal, but not in other marine-influenced coals. Sulfides are amenable to micro-PIXE studies because of the difficulties in obtaining the homogeneous standards required for many other TE microanalytical techniques.
机译:硫化物中微量元素(TE)的质子诱导的X射线微尺度辐射(PIXE)提供了对地质过程的见解,包括岩浆系统演化,成矿事件和流体流动过程。 Los Alamos核微探针用于确定来自多种地质环境(包括热液矿床,煤层和变质岩)的硫化物中的TE浓度和比率。硅质火山岩中的锂闪锌矿(Po)含有较高的Cu和Ni。清除湖火山岩中的Po具有比其他火山岩中的Po高的Mo。黄铁矿含高的Cu,As,Se,Mo和Pb,并且在下基坦顿州煤受到海洋影响的硫化物中显示出高As / Se和Mo / Se,但在其他受海洋影响的煤中却没有。由于难以获得许多其他TE微量分析技术所需的均相标准物,因此硫化物适用于micro-PIXE研究。

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