新疆查岗诺尔铁矿地质特征及成矿期次划分

Geological Characteristics and Metallogenic Period of Chagannur Iron Deposit

新疆和静县查岗诺尔铁矿床位于伊犁微板块北缘博罗科努岛弧带.矿区广泛出露石炭纪火山岩.该矿床由6个矿体组成,其中FeⅠ矿体为该铁矿床的主要矿体.主要矿石矿物磁铁矿的化学成分组成中,Fe2O3含量与SiO2含量大致呈此消彼长关系.矿区的主要矿物共生组合为磁铁矿+石榴石+阳起石(绿帘石)组合.矿床大致可以分为2个成矿时期和5个成矿阶段,即隐爆-矿浆成矿时期的矿浆成矿阶段和热液成矿阶段;隐爆-热液成矿期的磁铁矿-石榴石阶段、阳起石-绿帘石阶段和石英-碳酸盐阶段.矿床成因属于受到热液作用叠加改造的火山岩型铁矿床.

The Chagannur ore deposit in Hejing county of Xinjiang lies in the northern part of Ili-Issyk Kul lake sub-plate just within Bonohonu island arc-belt.The strata exposed in the mining areas are primarily volcanic rocks of Middle Carboniferous Series and Lower Carboniferous Series,which appear fault contact relationships.The deposit is consisted of six ore bodies,of which FeⅠ is the most important one.In the composition of magnetite,Fe2O3 content appears to have an negative correlation with that of SiO2,and the primary mineral association is magnetite-garnet-actinolite（epidote）.Chagannur Ore deposit can be approximately divided into two mineralization periods,one for cryptoexplosion-ore magma and the other for crytoexplosion-hydatogenesis;and five mineralization stages can be further identified,respectively ore magma stage,hydatogenetic stage,magnetite-garnet stage,actinolite-epidote stage and quartz-carbonate stage.As for formation,the iron deposit is a volcanic one which had been reacted intensively by hydrothermal activity.