贵州瓮安白岩陡山沱组磷块岩特征及矿床成因

Characteristics of Doushantuo Formation phosphorite and genesis of ore deposit in Weng'an,Guizhou Province,China

探讨贵州瓮安磷矿的磷块岩特征及磷矿床成因,为磷矿的勘查部署和开采提供理论依据。通过对瓮安白岩背斜震旦系陡山沱组含磷岩系岩石学、地球化学特征的分析,结合成矿环境、物质来源方面的地质特征研究,认为磷质来源于海底火山,受古地理环境、高水位海侵、上升洋流和生物有机质的作用,形成瓮安大型磷矿床。该磷矿的形成与陡山沱期古海洋环境改变所引发的生物事件关系密切,反映了震旦纪陡山沱期的后生生物早期爆发与成矿事件协同演化的特点。

Based on the analysis of petrological and geochemical characteristics of the Sinian Doushantuo Formation phosphorus bearing rock series in Weng'an area of Guizhou Province,combined with the geological characteristics of ore-forming environment and material source,it is proposed that the phosphorus material in the deposit is derived from the submarine volcano eruption,and the formation of large-scale phosphorite deposit is affected by paleogeographic environment,high water level transgression,rising ocean current and biological organic matter.The formation of Weng'an phosphorus deposit is closely related to the biological events caused by the changes of the paleo-marine environment in Doushantuo period,which reflects the characteristics of the early metazoan outburst and the co-evolution of mineralization events in the Sinian Doushantuo period.