云南宝兴厂金矿床地质特征及成因

文章总结了云南宝兴厂金矿区地质特征,划分了成矿期和成矿阶段,通过对硫、铅、氢氧同位素特征的研究,认为下奥陶统向阳组第四岩性段的碎屑岩为金成矿的矿源层。多期次的构造-岩浆活动,形成了该区多期次、多阶段、多样式、多矿种的矿床组合类型。矿床类型主要有:斑岩型、石英脉型、构造蚀变岩型、红土型等。该金矿的形成在时间、空间上与喜马拉雅期的富碱斑岩密切相关。

Geological characteristics and genesis of Baoxingchang gold ore district in Yunnan Province

Located in the north of the Ailaoshan ore-forming belt, the Baoxinchang gold deposit has its unique geotec-tonic location that has caused complex metallogenic geological conditions and frequent structural and magmatic activities. The formation of the gold deposit is closely related to Himalayan alkali-rich porphyry both in time and in space. This paper has summed up geological characteristics of this area and made a division of the ore-forming phases and stages. S, Pb, H, O isotope characteristics suggest that clastic rock of 4th lithologic member of Lower Ordovician Xiangyang Group seems to be the source bed of gold mineralization. Multiple phases of struc-tural-magmatic activity has resulted in the complexity of deposit assemblage types in this area characterized by multi-phase, multi-stage, diversity and multiple mineral species. Mineral deposits are mainly of porphyry, quartz-veined, tectonically-altered rock and laterite types.