论文部分内容阅读
意大利中部武尔西尼(Vulsini)、维科(Vico)和萨巴提尼(Sabatini)三个火山地区比较广泛地分布有铀和硫化铁的喷发-浅生矿化。矿化与火山岩有关,它们在一般化学-岩石特征,以及铀含量和其他伴生的微量元素方面都是一致的。显著的岩石化学特征是:K_2O 非常丰富,SiO_2欠饱和。钾似长石很常见。这些歪辉熔岩的平均铀含量为25ppm,最大为50ppm;平均钍含量为130ppm,最大为240ppm。本文讨论了放射性元素这种含量非常高的原因。铀矿化与岩浆 H_2S 喷气及喷发的黄铁矿和白铁矿的浅生风化有关。再者,矿床受地表和地下水文地质控制。矿化歪辉熔岩最显著的宏观特征是硅化和高岭石化。本文还讨论了矿化的经济意义以及由喷发-浅生成因所产生的局限性。与火山作用有关的铀矿床罕见。所以,这些产状的存在看来是很有意义的。
The volcanic-shallow mineralization of uranium and iron sulfide is more widely distributed in the three volcanic regions of Vulsini, Vico and Sabatini in central Italy. Mineralization is associated with volcanic rocks that are consistent in general chemical-rock characteristics, as well as uranium content and other associated trace elements. Significant petrochemical characteristics are: K_2O is very rich, SiO_2 less saturated. Potash feldspar is very common. These crooked lavas have an average uranium content of 25 ppm and a maximum of 50 ppm; an average thorium content of 130 ppm and a maximum of 240 ppm. This article discusses the reasons for the very high levels of radioactive elements. Uranium mineralization is associated with the shallow aeolian weathering of magmatic H 2 S and eruption pyrite and marcasite. Furthermore, the deposit is controlled by surface and hydrogeology. The most prominent macroscopic features of mineralized crooked lavas are silicification and kaolinite. This article also discusses the economic implications of mineralization and the limitations that result from eruption-ashes. Uranium deposits related to volcanism are rare. Therefore, the existence of these occurrences seems to make sense.