Abstract:Поступила в редакцию 9 июня 2017 г., после доработки -27 июля 2017 г.Предложен способ оценки основного состава микровключений самородного золота (Au, Ag) в сульфидных минералах, размеры которых сопоставимы или меньше области генерации рентге-новского излучения при электронно-зондовом микроанализе. Способ основан на экстраполяции ли-нейного тренда зависимости содержания (или интенсивности рентгеновского излучения) элемента включения в сравнении с содержанием (или интенсивностью излучения) элементов окружающей м… Show more
“…Substance composition determination was performed through local analysis methods using electron probe microanalysis (EPMA) on the JXA-8200 SuperProbe (JEOL Ltd., Tokyo, Japan) microanalyzer in accordance with the available techniques [93][94][95][96]. Grain surfaces were examined through a scanning electron microscope JXA-8200 SuperProbe (JEOL Ltd., Tokyo, Japan) with backscattered and secondary electrons to detect inclusions containing ore elements.…”
Section: Analysis Methodsmentioning
confidence: 99%
“…The chemical composition of the inclusions found was determined by the survey monitoring and recalculating the recorded relative intensities in the concentration using the JXA-8200 SuperProbe microanalyzer software (Version 01.42, JEOL Ltd., Tokyo, Japan). In determining the composition of finely dispersed gold inclusions with a size smaller than the locality of the EPMA method, matrix effects were taken into account following the method of content trends [95,96].…”
Section: Analysis Methodsmentioning
confidence: 99%
“…In the course of the work, it became obvious that the study of ore element BFs in loose alluvial sediments of watercourses is ineffective using traditional mineralogical methods. The successful solution of such types of tasks is directly related to the determination of the substance composition in micron inclusions and only through local methods, such as EPMA [93][94][95][96]. The binding forms of Au, Ag, Hg, Sb, As, Pb and Zn, the basic element indicators for the Au-Ag mineralization type, were investigated.…”
Section: The Binding Forms Of Element Indicators Of Gold-silver Minermentioning
confidence: 99%
“…Among the Ag sulphosalts, pyrargyrite and proustite were observed-minerals that are characteristic only of the supra-ore and upper-ore horizons of the Dukat deposit and that, with a sufficient degree of probability, can speak in favor of the positive prediction of deep mineralization. inclusions and only through local methods, such as EPMA [93][94][95][96]. The binding forms of Au, Ag, Hg, Sb, As, Pb and Zn, the basic element indicators for the Au-Ag mineralization type, were investigated.…”
Section: The Binding Forms Of Element Indicators Of Gold-silver Minermentioning
The composition, structure and formation features of the exogenous anomalous geochemical fields (AGFs) identified by lithochemical stream sediments (LSSs) are considered using the examples of the Dukat gold–silver ore-forming system and the deposit with the same name. The research was carried out in the Balygychan–Sugoy trough (Magadan region, north–east of Russia). Areal geochemical surveys on the 1:200,000 and 1:50,000 scales were conducted. Exogenous AGFs of basic element indicators of all known mineralization types were studied. It is shown that the surveys on the 1:200,000 scale are characterized by simplicity, relative depth and the possibility to obtain information operatively about the metallogeny of the area as a whole. At the same time, the anomalies were revealed as a result of surveys often making a relatively poor component composition and low contrast compared with ores. The violation of quantitative and sometimes qualitative relationships can be seen between elements, especially those related to gold–silver mineralization. In this situation, the most informative are surveys of LSSs on the 1:50,000 scale. The AGFs were revealed as a result of their performance to have a richer component composition and high contrast, conforming to different ore types. It is shown that, while prospecting for gold–silver mineralization with LSSs in cryolithogenesis zone conditions, the binding forms study of mineralization element indicators is effective. In watercourse heads, where alluvium is practically absent, mosses are proposed for sampling, as they hold the sandy silt material firmly. The obtained results are recommended for use at all stages of prospecting, not only in the north–east of Russia but also in other similar climatic regions.
“…Substance composition determination was performed through local analysis methods using electron probe microanalysis (EPMA) on the JXA-8200 SuperProbe (JEOL Ltd., Tokyo, Japan) microanalyzer in accordance with the available techniques [93][94][95][96]. Grain surfaces were examined through a scanning electron microscope JXA-8200 SuperProbe (JEOL Ltd., Tokyo, Japan) with backscattered and secondary electrons to detect inclusions containing ore elements.…”
Section: Analysis Methodsmentioning
confidence: 99%
“…The chemical composition of the inclusions found was determined by the survey monitoring and recalculating the recorded relative intensities in the concentration using the JXA-8200 SuperProbe microanalyzer software (Version 01.42, JEOL Ltd., Tokyo, Japan). In determining the composition of finely dispersed gold inclusions with a size smaller than the locality of the EPMA method, matrix effects were taken into account following the method of content trends [95,96].…”
Section: Analysis Methodsmentioning
confidence: 99%
“…In the course of the work, it became obvious that the study of ore element BFs in loose alluvial sediments of watercourses is ineffective using traditional mineralogical methods. The successful solution of such types of tasks is directly related to the determination of the substance composition in micron inclusions and only through local methods, such as EPMA [93][94][95][96]. The binding forms of Au, Ag, Hg, Sb, As, Pb and Zn, the basic element indicators for the Au-Ag mineralization type, were investigated.…”
Section: The Binding Forms Of Element Indicators Of Gold-silver Minermentioning
confidence: 99%
“…Among the Ag sulphosalts, pyrargyrite and proustite were observed-minerals that are characteristic only of the supra-ore and upper-ore horizons of the Dukat deposit and that, with a sufficient degree of probability, can speak in favor of the positive prediction of deep mineralization. inclusions and only through local methods, such as EPMA [93][94][95][96]. The binding forms of Au, Ag, Hg, Sb, As, Pb and Zn, the basic element indicators for the Au-Ag mineralization type, were investigated.…”
Section: The Binding Forms Of Element Indicators Of Gold-silver Minermentioning
The composition, structure and formation features of the exogenous anomalous geochemical fields (AGFs) identified by lithochemical stream sediments (LSSs) are considered using the examples of the Dukat gold–silver ore-forming system and the deposit with the same name. The research was carried out in the Balygychan–Sugoy trough (Magadan region, north–east of Russia). Areal geochemical surveys on the 1:200,000 and 1:50,000 scales were conducted. Exogenous AGFs of basic element indicators of all known mineralization types were studied. It is shown that the surveys on the 1:200,000 scale are characterized by simplicity, relative depth and the possibility to obtain information operatively about the metallogeny of the area as a whole. At the same time, the anomalies were revealed as a result of surveys often making a relatively poor component composition and low contrast compared with ores. The violation of quantitative and sometimes qualitative relationships can be seen between elements, especially those related to gold–silver mineralization. In this situation, the most informative are surveys of LSSs on the 1:50,000 scale. The AGFs were revealed as a result of their performance to have a richer component composition and high contrast, conforming to different ore types. It is shown that, while prospecting for gold–silver mineralization with LSSs in cryolithogenesis zone conditions, the binding forms study of mineralization element indicators is effective. In watercourse heads, where alluvium is practically absent, mosses are proposed for sampling, as they hold the sandy silt material firmly. The obtained results are recommended for use at all stages of prospecting, not only in the north–east of Russia but also in other similar climatic regions.
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