户撒盆地芒棒组第二段古气候特征及其对铀成矿作用的影响

滇西地区是国内重要的砂岩型铀矿带之一。近年,随着铀矿勘察工作的持续推进,先后发现了一系列新的铀矿化点和铀矿床。本文以户撒盆地新发现铀矿化层位为研究对象,运用地球化学方法探讨沉积期古气候特征。结果表明：户撒盆地芒棒组第二段为温暖潮湿环境下的淡水沉积;沉积水体总体为还原环境,部分过渡为氧化-还原环境。沉积水体环境是制约铀成矿的关键因素之一,沉积水体由还原环境逐渐过渡为氧化-还原环境是砂岩型铀矿的有利成矿层位。

Paleoclimate characteristics of the second member of Mangbei Formation in Husha Basin and its influence on uranium mineralization

Western Yunnan is one of China"s most notable sandstone uranium resources. With the steady growth of uranium exploration in recent years, a number of new uranium mineralization locations and uranium deposits have been discovered. Using geochemical methods, this work discusses the paleoclimatic aspects of the sedimentary period using the recently discovered uranium mineralization horizon in the Husa Basin. The results demonstrate that the second component of the Husa Basin"s Mangbang Formation is a freshwater deposit in a warm and humid environment; the sedimentary water body is normally in a reducing environment, with some moving to an oxidation-reduction environment. One of the major factors limiting uranium mineralization is the sedimentary water environment, particularly the progressive transition.