《黄金》杂志(月刊) 第39卷 总第415期
2018年07月 第07期
目次
黄金地质
  • 内蒙古赤峰岱王山金矿田石英二长岩中角闪石、斜长石化学成分特征及地质意义……刘承先,孙国胜,刘世伟,冯德胜,晋瑞香,何欣,赵天雪
  • 摘 要:岱王山金矿田位于赤峰—朝阳金矿带东部,是古亚洲洋闭合事件形成的造山型金矿床。对金矿田成矿时代、空间分布及矿床地质特征的研究表明,石英二长岩岩体是成矿母岩体。利用电子探针对石英二长岩中的角闪石和斜长石进行了化学成分分析及相关参数计算,结果表明:角闪石属于钙质角闪石中的铁韭闪石,斜长石为更长石和中长石;利用角闪石、斜长石化学成分估算的岩浆成岩压力为1.38×108~2.66×108 Pa、深度为5.20~10.04 km、温度为627 ~760 ℃、lg fO2-19.2~-15.5,表明成岩环境具有高温、高压和高氧逸度的特征。角闪石化学成分揭示岩浆的物质来源具有壳、幔混源的特征,是板块俯冲背景下由地幔楔与大陆地壳物质混熔形成。石英二长岩较高的成岩温度、压力和氧逸度条件,有利于Au元素在岩浆期后的成矿流体中富集,是成矿的有利岩石。

    Chemicalcompositions of amphibole and plagioclase in adamellite in Daiwangshan GoldField,Chifeng,Inner Mongolia and their geologic significance……Liu Chengxian,Sun Guosheng,Liu Shiwei,Feng Desheng,Jin Ruixiang,He Xin,ZhaoTianxue

    AbstractThe Daiwangshan Gold Field is located in the eastern part ofChifeng-Chaoyang gold ore belt,which is an orogenic gold deposit formed by theclosure of the paleo Asian Ocean.Through the study of the metallogenicepoch,spatial distribution and geological characteristics of the gold field,itis shown that the adamellite rock mass is the metallogenic parent rock mass.Bymeans of EPMA,the compositions of the amphibole and plagioclase in the ada-melliterock are analyzed and the correlated parameters are calculated.It shows thatthe amphibole belongs to ferropargasite in the calcic amphiboles,theplagioclase is attributed to oligoclase and andesine; based on the mineralchemical composition of the amphibole and plagioclase in the adamellite rock,its calculated that the magmatic diagenetic pressure is1.38×108-2.66×108 Pa,depth is 5.20-10.04 km,temperature is 627 -760 and the lg fO2 is -19.2--15.5,indicating that the diageneticenvironment is characterized by high temperature,high pressure and high oxygenfugacity.The chemical composition of amphibole revals that magma has thecharacteristics of a mixed source of crust and mantle,as which was formed bymixing the mantle wedge and the continental crust molten material in the platesubduction background.The high diagenetic temperature,pressure and oxygenfugacity of the adamellite are propitious to the enrichment of Au elements inthe ore-forming fluid in post magmatic period,which is a favorable rock massfor the mineralization.

    Keywords:Daiwangshan Gold Field; adamellite; amphibole; plagioclase; mineralchemical composition; oxygen fugacity

  • 关键词:岱王山金矿田;石英二长岩;角闪石;斜长石;矿物化学成分;氧逸度
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