在分析前寒武纪八公山组岩相古地理的基础上,详细地讨论了赋存于该组下段的大洪山铁矿的形成、富集和找矿方向。指出大洪山型铁矿主要形成在河流-滨海平原的后滨浅水洼地或支间海等较为封闭的环境(类似于泻湖)中。铁质从古老的岩石中淋滤而出,经地下水搬运到这些较宁静的浅水区,再通过化学和生物化学作用沉积下来。 Based on the analysis of the lithofacies palaeogeography of the Precambrian Yagongshan Formation, the formation, enrichment and prospecting of the Dahongshan Iron Ore, which occurred in the lower part of this group, are discussed in detail. It is pointed out that the Dahongshan type iron ore is mainly formed in a relatively closed environment (similar to a lagoon) such as a shallow water depression or a branch sea in a riverside - coastal plain. Iron is leached from ancient rocks, transported to these quieter shallow waters by groundwater, and deposited by chemical and biochemical processes.