摘要
陡山沱期的鄂西台地东部是一个重要的大型磷矿产出区域，其沉积磷矿床以各种类型的生物泥丘存在，生物泥丘为磷矿床的容矿体并直接控制着矿床的形态和品位。研究表明，水体中富磷营养化特殊环境导致了局部地段生物群落的超速繁殖，其代谢活动极大地抑制了水体中碳酸盐的沉积掺和作用而使其中的磷酸盐优先沉积富集形成泥丘。不同泥丘分别形成于正常清水潮坪、局限还原浅滩和广海高能带等环境中，其微生物群落组合也相应从以底栖藻类为主，至底栖、漂浮混合到底栖、漂浮、高级藻类复合型等变化，从而形成本区Ⅰ、Ⅱ和Ⅲ三种类型不同的生物泥丘磷块岩矿床。
The Sinian Period of the Doushantuo an stage in the east region of Western Hubei Platform is an important place forming major phosphorite deposits in China. In the phosphate bearing horizons of the Doushantuo Formation, various kinds of mud mounds are vastly developed in this plotform, especially in its eastern portion. The mud mounds contain in phosphatic deposits and control the shape and grad of the phosphorite deposits. The present research indicates that the supersession of microbial communities restrained the adulteration of carbonates when the phosphates were deposited in sea water,while ancient ecological environments changed from benthic microbial communities in clean water to planctonic ones respectively in clim water and turbid weter. Tree types of phosphatic mud mounds (i.e.Types Ⅰ, Ⅱ and Ⅲ) were formed and they generated the main phosphorite deposits utilized by industry in this area.
基金
国家自然科学基金
地质行业基金
关键词
鄂西
台地
泥丘
生物群落
聚磷
控矿作用
east region of western Hubei platform mud mounds biocenosis phosphate-rich
