青海省典型铁矿矿床特征及其成矿系列的浅析

Characteristics of typical iron ore deposits and their metallogenic series in Qinghai Province

青海省铁矿床(点)成因类型可划分为镁铁-超镁铁岩浆成矿系列的结晶分异型矿床;壳幔型中酸性岩浆成矿系列的热液型、矽卡岩型矿床;火山喷流-沉积成矿系列的层控型矿床;叠加改造成矿系列的层控改造型、改造热液型、沉积变质型矿床;沉积喷流成矿系列的层控型矿床;沉积成矿系列的陆、海相沉积型矿床。通过对这些成矿系列的典型铁矿矿床特征的研究,从其成矿构造地质环境分析,许多铁多金属矿床(点)均具有形成大型以上矿床的成矿地质条件,且多伴生铜、铅、锌、金银等多金属矿产。研究认为,在今后的找矿勘查过程中,应利用成矿系列的规律,并注重对共(伴)生组分的综合评价,这对扩大全省的找矿远景,提高资源综合利用水平,提高铁矿床技术经济价值具有重要的意义。

Most of the iron deposits （spots） in Qinghai belongs to the crystallization differentiation type deposit in marie-super mafic ore forming system; crust-mantle type intermediate to acidic magma ore forming system; skarn type deposit; stratabound deposit in volcanic spout-sediment ore forming system; stratabound transformation type, transformed hydrothermal type, depositional metamorphic type in superimposed transformation ore forming system; stratabound deposit in depositional spout ore forming system; continental and sea facies depositional type in sedimentation ore forming system. It can be seen through the research on typical iron deposits in these ore forming series that many iron-polymetallic deposits （spots） all possess the ore forming geological conditions for large to gigantic ore deposits and mostly associated with copper, lead, zinc, gold and silver polymetallic deposits based on the geological environment analysis of the metallogenic structures. It is believed by the research that the comprehensive assessment of associated components should be paid attention to during the exploration process in future, as it is great significant to enlarge the deposit scale, upgrade the level of mineral resources comprehensive utilization and raise the technique and economic value of the iron deposits.