河南小秦岭金矿田大湖金-钼矿床流体包裹体特征及矿床成因

河南灵宝大湖金-钼矿床位于小秦岭金矿田，属典型的断控脉状矿床。成矿过程经历3个阶段：早阶段为黄铁矿-石英脉，遭受变形、破碎，应形成于挤压或压剪过程；中阶段为细粒的辉钼矿-黄铁矿-石英网脉，贯入到早阶段黄铁矿或石英矿物的裂隙（可呈共轭状），应形成于剪切环境；晚阶段石英-碳酸盐细脉具梳状构造，充填于张性或张扭性裂隙。即，流体成矿作用发生在赋矿断裂由挤压或压扭转向伸展或张扭性的过程中。旱阶段只发育CO2-H2O型流体包裹体；中阶段流体包裹体类型复杂，有纯CO2型、CO2-H2O型、H2O-NaCl型和含子晶包裹体，指示流体沸腾作用强烈；而晚阶段只发育水溶液包裹体。早、中、晚3个阶段的流体包裹体均一温度分别集中在400—500℃、290～470℃、220～260℃；估计的早、中阶段流体的最低捕获压力分别为138～331MPa和78～237MPa，对应于成矿深度分别为13．8km～11．0km和7．8km～8．0km。因此，成矿流体具中-高温、中-深成、低盐度、富CO2的特征，与中-深成造山型矿床一致。大湖金-钼矿床的成矿流体形成和演化及其成矿作用可利用CMF模式进行合理解释。

Characteristics of fluid inclusions and ore genesis of the Dahu Au-Mo deposit in the Xiaoqinling gold field,Henan Province.

The Dahu Au-Mo deposit,Lingbao County,Henan Province,is a typical fault-controlled lode deposit occurred in the north part of Xiaoqinling gold field.The ore-forming process can be divided into three stages.The early stage is characterized by pyritequartz veins,in which minerals were structurally deformed and broken,indicating that they formed in a compression or compressive distortion setting.The middle stage is characterized by molybdenite-pyrite-quartz stockworks (mostly coaxial or conjugated) infilling t...