关键词: 金矿床, 地质特征, 地球化学, 成矿构造环境, 黑龙江省塔河县

Abstract: The Baoxinggou gold deposit, located in the south margin of upper Heilongjiang Foreland Basin, is discovered rencently and of great ore prospecting potential. Gold ore bodies are mainly hosted inner the shallow intrusion and its contact zone with sandstone formation. The deposit is closely related to the quartz diorite and diorite-porphyrite. Geochemical studies show that the two types of magmatic rocks associated with gold mineralization belong to high-K and calc-alkaline rocks and they are rich in REE,with no obvious Eu anomaly, while with significantly negative Nb,Ta, T, Zr, Yb, Y and positive Rb, Th, K. The LA-ICP-MS U-Pb isotopic dating of single zircons from the quartz diorite indicates that the age of （124.92±1.3） Ma represents the crystallization age of diorite. In light of the age of granite-aplite varying from 150 Ma to 450 Ma, it can be guessed that its diagenesis age is about 156 Ma. The Baoxinggou gold deposit was resulted from the  tectonic-magmatic-hydrothermal process associated with the tectonic stress field transition from compression to extension in early Cretaceous period and the gold mineralization took place in 107.5-124.92 Ma. Meanwhile, it can be concluded that there existed gold mineralization companying with the Cretaceous magmatism in the south part of Da Hinggan Mountains. Therefore, the districts developing the Late Yanshanian (Early Cretaceous epoch) magmatic activities, especially the shallow intrusions are important ore-prospecting targets for further exploration.

Key words: gold deposit, geological characteristics, geochemistry, metallogenic tectonic environment, Tahe County in Heilongjiang Province