黑龙江大安河金矿控矿条件及成矿机理分析

大安河金矿为夕卡央型金矿，产于中国东部燕山期滨太平洋大陆边缘地块之间的构造岩浆活动带中，二叠系变质碎屑岩－碳酸盐岩建造，壳幔混源同熔型钙碱性闪长岩，SN向和NW向石圈断裂及其次级断裂，为控矿基本条件，成矿具多期多阶段性，可归结为三期，即：早期为夕卡岩化和碱交代（岩浆热液）期；中期为退化交代（岩浆水与大气降水混合热液）期，是金的主成矿期，伴随的退化交代作用，使金富集成矿，晚期为碳酸盐化作用，代表金矿成矿作用的结束。

Ore Controlling Conditions and Mineralizing Mechanism of Da'anhe Gold Deposit, Heilongjiang Province

Da'anhe gold deposit belongs to skarn type, which is located in the Yanshanian tectonomagmatic belt within the circum-Pacific continental margin in east China. The basic ore-controlling conditions include the Permian metamorphosed classic, Carbonate formation, the syntectic calc-alkaline diorite, and the SN-,NW-trending lithosphere fractures and their secondary ones. The deposit is of the feature of multi-phased mineralization,which can be divided into three periods. The early period is the skarnization and the alkaline replacement (caused by magmatic fluid). The retrogressive alteration (resulted from the mixed fluid of magmatic and meteoric ones)belongs to the middle period. Carbonatization happpened in the late and it was caused by emteoric water. Gold mineralization mainly took place in the middle period. Accompanying the retrogressive alteration,gold was enriched into industrial ore bodies.