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。
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.
出处
《西北地质》
CAS
CSCD
2011年第1期61-68,共8页
Northwestern Geology
基金
内蒙古自治区额济纳旗呼伦西白金(铜)矿普查(04-1-KC10
05-6-KC10)
关键词
呼伦西白金矿
岩浆热液型
次火山岩型(或岩浆隐爆角砾岩型)
成矿模式
找矿标志
Hulunxibai gold deposit
magmatic hydrothermal type
subvolcanic type（magma cryptoexplosion breccia type）
the ore-forming model
ore-prospecting criteria
