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Terrestrial radioisotopes as paleoenvironmental proxies in sedimentary formations

机译:陆地放射性同位素作为沉积地层中的古环境代理

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摘要

The presence of anomalous terrestrial radioisotopes must be suspected in black shale-hosted manganese ore deposits, based on high organic matter content, which is useful tool in genetic, among them paleoenvironmental investigations. Our work aims at the characterization of the paleoredox conditions of the Urkut Manganese Formation based on comparison of terrestrial radioisotopes and selected element ratios. Paleoredox indicators were estimated on U/Th, delta U, Ni/Co, V/Cr, V/(V + Ni) and Ce*. The results of paleoredox indicator element ratios show, that these methods must be used with caution (microbial selective element enrichments, mobilizations), and the complex interpretation using mineralogy and microtexture can be recommended.
机译:基于高有机质含量的黑色页岩型锰矿床中必须怀疑存在异常的地面放射性同位素,这是遗传学中有用的工具,其中包括古环境研究。我们的工作旨在根据陆地放射性同位素和所选元素比率的比较,表征乌尔库特锰组的古氧化还原条件。估计过氧化还原指标的单位为U / Th,δU,Ni / Co,V / Cr,V /(V + Ni)和Ce *。古氧化还原指示剂元素比率的结果表明,必须谨慎使用这些方法(微生物选择性元素的富集,动员),并建议使用矿物学和微观结构进行复杂的解释。

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