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吉林省西岔金银矿床多阶段石英原位组成及地质意义

In-situ composition and geologic significance of multi-stage quartz in Xicha Gold-Silver Deposit,Jilin Province

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西岔金银矿床为早白垩世中温热液脉型,主要产金,伴生银.成矿过程先后经历了热液成矿期和表生成矿期.其中,热液成矿期可划分为3 个成矿阶段,每个成矿阶段都发育热液石英.利用LA-ICP-MS原位微区分析技术,对不同成矿阶段石英开展了微量元素组成分析.结果显示,第二阶段为主成矿阶段,矿化最为强烈,是金的主要生成阶段.载金矿物以硫化物为主,但第二阶段Sb、Bi含量显著升高,Au、Ag与Cu、Pb、Zn等金属元素具有正相关关系,说明主成矿阶段的载金矿物可能还有碲化物和铋化物,以微颗粒形式包裹于石英中.基于热液石英Ti含量构建的石英Ti地质温度计显示,热液成矿期成矿温度逐渐降低.石英中Al、Ti、Li含量的规律性变化,表明成矿流体pH逐渐升高,由最初的酸性逐渐向中性、弱碱性演化.
Xicha Gold-Silver Deposit is classified as a mesothermal vein type deposit formed in the Early Creta-ceous,primarily containing gold with associated silver.The mineralization process went through both a hydrothermal mineralization period and a supergene mineralization period,with the hydrothermal mineralization period divided into 3 stages,each characterized by the development of hydrothermal quartz.Using LA-ICP-MS in-situ micro-zone analysis techniques,micro element composition analysis of quartz at different mineralization stages was conducted.The results indicate that the second stage is the main mineralization stage with the strongest mineralization,serving as the primary gold mineralization phase.Gold-bearing minerals are predominantly sulfides,but during the second stage,the content of Sb and Bi significantly increases,and gold and silver show a positive correlation with other metallic elements such as copper,lead and zinc,suggesting that the gold-bearing minerals in the main mineralization stage may also include telluride and bismuthide,or be encapsulated in quartz in the form of fine particles.The quartz Ti geothermome-ter constructed based on the titanium content in hydrothermal quartz indicates a gradual decrease in mineralization temperature during the hydrothermal mineralization period.The systematic changes in Al,Ti,and Li content in quartz suggest a gradual increase in fluid pH from initial acidity towards neutral to weak alkalinity.

hydrothermal quartzLA-ICP-MSin-situ micro-zone analysis techniqueTi geothermometerore-forming fluidgold-bearing minerals

马敏霞、孙凌云、孙金磊、赵昌吉、钱烨

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潜江市不动产登记中心

吉林大学地球科学学院

中国科学院地球化学研究所

深部金矿探测大数据应用开发山东省工程研究中心

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热液石英 LA-ICP-MS 原位微区分析技术 Ti地质温度计 成矿流体 载金矿物

吉林省自然科学基金吉林省自然科学基金深部金矿探测大数据应用开发山东省研究中心开放课题

20220101161JC20170101201JCSDK202203

2024

10.11792/hj20240614

黄金
长春黄金研究院

黄金

CSTPCD
影响因子：0.446
ISSN：1001-1277
年,卷(期)：2024.45(6)
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