《黄金》杂志(月刊) 第39卷 总第414期
2018年06月 第06期
目次
黄金地质
  • 辽西北地金矿床1号矿脉地质特征及流体包裹体研究……张佳楠,杨韩涛,王欢,赵丽敏,王力
  • 摘 要:1号矿脉为北地金矿区主要工业矿脉,产于燕山期石英二长岩内,受南北向断裂构造控制。对北地金矿床金矿石进行了镜下鉴定、电子探针分析和流体包裹体岩相学、显微测温研究。结果表明,北地金矿床中金矿物主要以银金矿为主,成矿作用可分为热液成矿期和表生氧化期,其中热液成矿期具有多阶段性特点,围岩蚀变发育。金矿石石英中主要发育含CO2包裹体、气液二相包裹体、含CO2三相包裹体和纯CO2包裹体,成矿过程中流体经历了NaCl-H2O-CO2体系的不混溶作用;成矿流体具有低盐度(1.63 %~9.34 %NaCleqv)、低密度(0.66~0.96 g/cm3)的特点;成矿温度集中于260 ~320 ℃,成矿压力为63124 MPa,成矿深度为6.399.26 km。综合分析确定,矿床成因类型为受断裂构造控制的中温热液脉型金矿床。

    Geologicalcharacteristics and fluid inclusions of the No.1 vein in Beidi Gold Deposit inwestern Liaoning Province……Zhang Jianan,Yang Hantao,Wang Huan,Zhao Limin,Wang Li

    AbstractThe No.1 vein of the Beidi Gold District is the main industrial vein in themining area,which occurs in the quartz monzonite of Yanshan period and iscontrolled by the NS fault structure.Microscopic identification,electronmicroprobe analysis and fluid inclusion analysis of the ore in the Beidi GoldDeposit were carried out as well as studies on its petrography and microscopictemperature measurement.The results show that the gold minerals in the BeidiGold Deposit are mainly silver and gold.Mineralization is divided into 2stages:hydrothermal mineralization stage and supergene oxidation stage.Amongthem,the hydrothermal mineralization period is characterized by multistage andthe alteration of surrounding rocks.Gold-bearing quartz mainly consists of CO2inclusions,gas-liquid two-phase inclusions,CO2-containing three-phaseinclusions and pure CO2 inclusions.During the ore-formingprocess,the fluid underwent immiscibility in the NaCl-H2O-CO2system.The ore-forming fluid is characterized by low salinity (1.63 %-9.34 %NaCleqv) and low density (0.66-0.96 g/cm3).The metallogenictemperature concentrated between 260 and 320 .The ore-forming pressure is 63-124 MPa.The ore-formingdepth is 6.39-9.26 km.The genetic type of the deposit is determined to be amesothermal hydrothermal vein gold deposit controlled by the fault structure.

    Keywords:geological characteristics; fluid inclusion; petrography; microscopictemperature measurement; Beidi Gold Deposit; western Liaoning

  • 关键词:地质特征;流体包裹体;岩相学;显微测温;北地金矿床;辽西
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