马超营断裂带流体系统地球化学特征

在研究马超营断裂带主要金矿床的流体包裹体组成及成分特征基础上, 综合分析归纳了流体系统地球化学特征, 研究了流体的组成、来源及演化特征, 认为成矿流体具有低盐度、弱碱性及较高矿化度的混合成因特点, 早期成矿流体以深源为主, 晚期则混有大量大气水演化形成, 分析了影响流体演化的控制因素及金等成矿物质在流体中的迁移、沉淀机制, 提出流体活动是成矿作用的核心, 对成矿流体系统的研究, 有助于从本质上揭示马超营断裂带金矿成矿条件和成因, 更好地认识金矿成矿规律与进行成矿预测。

FLUID GEOCHEMICAL CHARACTERISTICS OF MACHAOYING FAULTED BELT

Based on a detailed study of compositional characteristics of fluid inclusions in major gold deposits along Machaoying faulted belt, the authors have summed up fluid geochemical characteristics and probed into compositions, sources and evolution of the fluids. It is held that the ore-forming fluids are of mixed geneses characterized by low salinity, weak alkalinity and relatively high degree of mineralization, with the ore-forming fluids being derived from deep sources at the early stage and mixed with large quantities of meteoric water at the late stage. The factors governing fluid evolution and the mechanisms controlling the migration and precipitation of gold and other ore-forming materials in fluids have been analyzed. The fluid activities seem to be the key factor for mineralization. The systematic study of ore-forming fluids helps to reveal in essence the metallogenic conditions and geneses of gold deposits in Machaoying faulted belt, and contributes to better understanding of gold metallogenic regularity and prognosis of ore deposits.