摘要:
额济纳旗呼伦西白金矿床位于呼伦西白-珠斯楞反"S"型弧形构造的西端,北西向断裂规模较大,既是主要的控岩、控矿构造,也是热液活动的主要通道;后期叠加的北东向次级构造(与次火山岩活动或岩体的深部隐爆作用有关)是本区重要的储矿构造。矿体赋存在侏罗纪斑状黑云母花岗岩、正长斑岩内或与地层接触的内外带的不同构造部位,成矿物质主要来源于该期次火山岩活动,属于岩浆期后热液碎裂蚀变型、次火山岩型(或岩浆隐爆角砾岩型)金矿床。矿区内已发现的13条金矿脉产出环境可分为两种类型:一种是岩体内部或与围岩的内接触带,另一种是外接触带中的破碎带(或薄弱带)。与金矿形成关系密切的蚀变主要为硅化、黄铁矿化、黄铜矿化,含金品位与这些金属硫化物(或其氧化物)的含量呈正相关关系。在分析矿床的成矿地质条件的基础上,初步建立了该矿床的成矿模式,总结了综合找矿标志。
Abstract:
Hulunxibai gold deposit is located in the western of hulunxibai-zhusileng reverse "S"-type arcuate structure.The NW-striking faults are large in scale,not only the main rock-and ore-controlling structures,but also the important pathways for hydrothermal activity.The late superimposed NE-striking secondary structures related to sub-volcanic rocks activity or deep cryptoexplosion are important depositing ore structure.Metallogenic materials are mainly from Jurassic porphyry biotite granite,syenite porphyry and gabbro.Ore-bodies are hosted in different structure positions with Jurassic porphyry biotite granite,syenite porphyry-sub-volcanic rock activity(or deep cryptoexplosion),and belong to post magmatic hydrothermal cataclastic altered rock type or subvolcanic type (magma crypto-explosion breccia type) gold deposit.The occurrence environment of the 13 gold veins having been discovered can be divided into two types: one is inner rock body or inner contact zone with wall rock,the other is outer contact interstratified fracture zone (weak zone).The major alterations closely related to ore-forming are silicification,pyritization,and chalcopyritization,and there is a positive correlation between gold grade and contents of metal sulfides.Based on the analysis of metallogenic geological conditions,the ore-forming model has been established preliminarily.
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