江苏船山石灰石矿床沉积环境

Depositional environment of limestone deposit in Chuanshan of Jiangsu

根据每组石灰石中都含有大量的海洋沉积窄盐度生物及藻类化石,推断船山矿床为浅海碳酸盐沉积;从每组石灰石的粒度、颜色、结构构造,推断出该矿床在形成过程中有两次大规模海侵,两次沉积中断。沉积环境的变化决定了石灰石的质量,氧化环境里形成的石灰石颜色较浅较纯可作为熔剂,还原环境里形成的石灰石颜色较深,有机质含量高只能作为水泥原料。

The different beds of limestone in Chuanshan ore district were of varied sedimentary characters.The authors deduced Chuanshan limestone deposit was shallow sea carbonate deposition based on narrow salinity life-forms and algae fossils of marine deposition existed in each set of limestone;deduced there happened twice large-scale marine ingression and twice depositional intermit in lights of the particle,color,texture and structure.The variation of depositional environment determined the quality of limestone.The limestone formed in oxidized environment showed a shallow color and better purity and could be served as flux,the limestone formed in deoxidized environment showed a dark color and a high content of organic matter and only be served as cement raw material.