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对渔塘坝硒矿床中高硒的碳质硅质岩和碳质页岩样品进行了硒同位素测定.测定结果显示,其δ82/76SeNIST范围从-12.77‰～4.93‰,总变化为17.7‰.这是迄今所发现的自然界中最大的同位素分馏,同时样品Ytb-5(高硒碳质页岩)的δ82/76SeNIST为-12.77‰,也是目前所发现的自然界中最富硒轻同位素的样品.根据硒同位素的分布特征,结合其他地质证据和地球化学指标,认为“氧化-还原模式”是对矿床中自然硒大量出现的合理解释.同时,硒同位素在自然界中较大的分馏效应也证明其作为一种新的地球化学示踪剂有其独特的应用潜力.
Selenium isotope determination of high-selenium carbonaceous silicalite and carbonaceous shale in the sectoral gold deposit of Yudangba shows that the δ82 / 76SeNIST ranged from -12.77 ‰ to 4.93 ‰ with a total variation of 17.7 ‰ The largest isotopic fractionation found in nature so far, and δ82 / 76SeNIST of sample Ytb-5 (high selenocarbonaceous shale) is -12.77 ‰, which is also the most abundant Se isotope found in nature. According to selenium According to the distribution characteristics of isotopes and other geological evidences and geochemical indicators, it is considered that the “oxidation-reduction mode” is a reasonable explanation for the large number of natural selenium occurring in the deposit, and the larger fractionation effect of selenium isotopes in nature also proves As a new geochemical tracer has its unique potential.