河南卢氏地区黑色岩系沉积型褐铁矿及其伴生钼锌组分的工业价值探讨

Discussion on the industrial value of sedimentary limonite deposit in black rock series and associated molybdenum and zinc components in Lushi area,Henan

沉积型铁矿床以赤铁矿和磁铁矿为主,罕见沉积型褐铁矿床。黑色岩系中富集Mo、Ni、V、PGE实例较多,但黑色岩系中发现有沉积型褐铁矿床的报道少见,更未见沉积型褐铁矿床中有Mo、Zn矿化的报道。河南卢氏地区震旦系东坡组黑色岩系中发育有褐铁矿化,并伴生有钼、锌元素大规模高强度异常,前人认为是“铁帽”,深部有找寻大型硫化物原生矿床的潜力。通过对铁矿床含矿建造的重新厘定和成矿环境的恢复,以及对成矿物质来源的示踪,达到了对成矿过程的精细研究,认为区内铁矿化原始成矿方式为沉积成矿,主要以褐铁矿形式沉积,赤铁矿次之,后期强烈的构造变形使矿体遭受强烈的风化淋滤改造,致使矿床成因信息受到掩盖,是“假铁帽”。钼、锌元素以离子形式被铁质胶体和有机质吸附、携载迁移,在特定部位共同卸载沉淀,无独立的钼、锌矿物产出,没有工业价值。

The sedimentary iron deposits are mainly hematite and magnetite type,and the sedimentary limonite deposits are rare.There are many examples of enrichment of Mo,Ni,V and PGE in black rock series,but there are few reports of sedimentary limonite deposits in black rock series,and there are no reports of Mo and Zn mineralization in sedimentary limonite deposits.In the black rock series of Sinian Dongpo Formation in Lushi area of Henan Province,limonite mineralization is developed,accompanied by large-scale and high-intensity anomalies of molybdenum and zinc.It is considered to be'iron cap'by previous researches,and there is a potential to explore for the large sulfide primary deposit in the deep part.Through the redefinition of the ore-bearing construction of the iron deposit and the restoration of the metallogenic environment,as well as the tracing of the source of ore-forming materials,the detailed study of the metallogenic process is carried out.It is considered that the original metallogenic mode of iron mineralization in the area is sedimentary mineralization,mainly in the form of limonite,followed by hematite.The strong tectonic deformation in the later period has caused the ore body to undergo strong weathering and leaching,resulting in the genetic information of the deposit being covered up,which is a'false iron cap'.Molybdenum and zinc elements are adsorbed,carried and migrated by iron colloids and organic matter in the form of ions.They are unloaded and precipitated together in the specific parts.There is no independent molybdenum and zinc minerals produced,and there is no industrial value for them.