新疆和静敦德铁锌矿床地质特征及成因探讨

Geological Characteristics and Origin of Dunde Iron-Zinc Deposit in Hejing County, Xinjiang

和静县敦德铁锌矿床是新疆西天山一带近几年新发现并即将投入开采的中型铁锌矿床。该矿床产于南天山造山带下石炭统大哈拉军山组火山-碎屑岩建造中，矿床由几十个呈层状、似层状、透镜状、不规则条带状矿体组成，产于玄武质凝灰岩、安山岩、蚀变安山岩中。矿体位于破火山口环形构造的外环断陷带内，矿物组合主要为磁铁矿、闪锌矿、赤铁矿、褐铁矿，次为磁黄铁矿、黄铁矿、方铅矿和黄铜矿、钛铁矿、铬铁矿。矿石主要结构为它形-半自形、自形粒状结构、它形不规则状结构、交代结构、包裹结构。矿石主要构造为稠密浸染状构造、块状构造、星点状构造、条带状构造、稀疏浸染状构造，次为不均匀浸染条带状、网脉状构造、细脉状构造、角砾状、斑杂状构造。通过对矿石结构、构造、矿物组合特征、火山集块岩及区域构造环境特征综合分析认为，该矿床的形成与火山通道附近的火山构造隐爆作用密切相关。

Dunde iron-zinc deposit in Hejing county of westem tianshan mountain is a medium-sized ore mining, which is descoveried and will be put into mining in recent years. The deposit comes from the volcaniclastic rock which is named Dahalajunshan in orogenic belt of south tianshan. It makes up by dozens of layered ,similar layeared ,lenticular, Irregular banded ore bodies.It occurs in the basaltic tuff, andesite,alteredandesite. Orebodies are located in the caldera of the outer ring structure rift zone.Deposit mineral assemblages are mainly by magnetite, sphalerite, hematite, limonite, followed by pyrrhotite, pyrite, galena and chalcopyrite, ilmenite, chromite. The mineral main texture includes allotriomorphic texture, panidiomorphic texture, metasomatic ring texture, Parcels texture. Ore main structure includes dense disseminated struc- ture, massive structure, star point-like structure, banded structure, sparsely disseminated structure;Secondary structure in- cludes uneven dip banded structure, stockwork structure, veinlets structure, brecciated structure, mottled structure. Through comprehensive analysis structure of the ore and ore mineral assemblages, volcanic rock and the regional tectonic environment characteristics Indicating that the iron-zinc deposit formation associated with the Volcano-tectonic cryptoex- plosion closely.