河南舞阳铁矿田含矿岩系原岩及古环境恢复

Protolith of iron-bearing strata and restoration of plaeo environments of Wuyang iron ore deposit,Henan

河南舞阳铁矿田地处河南舞阳—新蔡铁矿集区的重要区段上,已探明铁矿石资源储量超过10亿t,且仍有较大的找矿潜力。为在钻探施工过程中准确地确定所在层位,预测矿层,矿体连接时保障其准确性,根据矿物组成及其退化变质规律和沉积过程中碎屑颗粒大小及其比重差异,对含矿岩系原岩及古环境进行了恢复。笔者认为,主要含矿地层物质来源,赵案庄组为喜庄组风化剥蚀物、超基性海底火山喷发物、海洋物质的混合物;铁山庙组为喜庄组、赵案庄组风化剥蚀物、基性海底火山喷发物、海洋物质的混合物。基性、超基性火山喷发物质首先在陆地上沉积,后经搬运、分选,在潮坪环境下形成磁铁矿矿体。

The Wuyang iron ore deposit is located in the Wuyang - Xincai iron mineralization concentration area in Henan Prov- ince, and the proven iron ore reserve is more than 1 billion tons, and still there is huge potential for iron prospecting. In order to accu- rately determine the drilling positions, to predict the iron - bearing layer and outline the orebody precisely, the protolith of iron - bear- ing strata and paleo - environment were conducted according to the mineral composition, degeneration regulation, and the particle size of clasts and gravity difference of the deposition process. Based on the study, it is concluded that the main material sources of ore - beating layers are as followings： Zhaoanzhang group material sources result from the weathered materials of Xizhuang group, subfloor ultra - basic volcanic eruption and marine substances. Tieshanmiao group source materials results from weathered materials of Xizhuang group and Zhaoanzhuang group, subfloor ultra - basic volcanic eruption and mixture of marine substances. The ultrabasic and basic vol- canic eruption materials were first deposited on the land, then by transportation and differentiation, the magnetite ore deposit was formed in the flat tidal environment.