江西“新余式”铁矿地质特征及成因探讨

Geological Characteristics and Ore Genesis of The Xinyu Type Iron Deposits

"新余式铁矿是华南重要的铁矿类型之一,也是我国最年轻的硅-铁建造型铁矿之一。本文在归纳总结新余铁矿的含铁岩组、矿体及矿石地质特征的基础上,分析"新余式"铁矿床的成因及成矿模式,认为该矿床是以海底裂谷火山喷发沉积形成,后经低级变质作用改造,属沉积变质型铁矿床。其成矿模式大致可分为火山—沉积成矿、变质变形成矿、改造保存三个阶段。

As one of the youngest BIF iron ore deposits,the Xinyu type iron deposits serve as one of the important iron types in South China. On the basis of generalizing geological characteristics of iron-containing petrofabric and ore body,genesis and ore-forming model of the Xinyu type iron deposits were analysed. Conclusion is that the deposits were Sedimentary-metamorphic iron deposits which formed in submarine rift under the influence of volcanic eruption and sedimentation,then experienced reformation of low-grade metamorphism. It's ore-forming model can be divided into three stages: volcanic sedimentary mineralization,metamorphic mineralization and reformation & conservation.