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下金宝金矿床位于永安—下营房—毛家沟金多金属成矿带。本文作者以河北下金宝金矿床流体包裹体和稳定同位素为研究对象,分析了本区成矿物质来源、成矿流体来源及其演化,进而探讨本矿床的成矿机理。宏观地质特征和S、Pb同位素示踪结果表明,本区成矿物质主要由下金宝花岗质岩浆提供,部分来源于围岩。H、O同位素组成特征显示,本区成矿流体来源于岩浆水。流体包裹体特征表明,本区早阶段的成矿流体在演化过程中发生了沸腾作用,导致金的沉淀,中、晚阶段成矿物质沉淀的主导因素为流体的混合作用,而水/岩反应促使金沉淀的现象贯穿成矿的始终。
Xia Campbell gold deposit is located in Yongan - under the barracks - Maojiagou gold polymetallic metallogenic belt. Based on the fluid inclusions and stable isotopes of the XCMG gold deposit in Hebei Province, the authors analyzed the source of ore-forming materials, source of ore-forming fluids and their evolution in this area, and discussed the metallogenic mechanism of this deposit. The macroscopic geological characteristics and S, Pb isotope tracing results show that the ore-forming materials in this area are mainly provided by Xiajampao granitic magma and partly from the surrounding rock. The characteristics of H and O isotopic compositions show that the ore-forming fluid in this area is derived from magmatic water. The characteristics of fluid inclusions indicate that the ore-forming fluid in the early stage of this area has a boiling effect during the evolution process, leading to the precipitation of gold. The dominant factor of precipitation of ore-forming materials in the middle and late stages is the fluid mixing effect, while the water / rock reaction Promote the phenomenon of gold precipitation throughout the mineralization has always been.