摘要
着重研究了东伙房金矿床矿物包裹体的空间分布，并将其用于解释矿床成因。研究了成矿压力场、温度场和热液沸腾与矿质沉淀的关系，利用矿物包裹体气相和液相成分测定结果讨论了金的搬运形式。论述了碱性潜火山岩正长斑岩体与成矿的关系，指出矿床形成于印支期地幔热柱引发的张性成矿动力学背景之下。
Boiling inclusions are first discovered in Donghuofang gold deposit. The distributions of boiling inclusions and orebodies in vertical project indicate that abrupt decrease of ore forming pressure is the most important factor, causing boiling of ascending ore fluid along the opening fault. Boiling of ore forming fluid and decrease of the temperature made Au precipitate in the gold veins. The study on the compositions of fluid inclusions shows that the transport forms of gold in Ⅰ and Ⅱ mineralizing stages were complex Au S, but in Ⅲ mineralizing stage complex Au Cl is major form of transportation. Space time ralationship between orebodies and syenite stock, and the mineralizing thermal field of gold veins around this stock show them having similar sources. Alkali magma which formed the syenite stock was from mantle. Bimodal magmatic association in Donghuofang gold deposit shows the extensional metallogenic geodynamic related to the mantle plume, so the Donghuofang gold deposit is hypo mesothermal deposit. It is connected with alkali magma, and formed at period of India China(239 98Ma).
出处
《现代地质》
CAS
CSCD
北大核心
1998年第4期477-484,共8页
Geoscience
基金
高等学校博士学科点专项科研资金
关键词
金矿床
矿物包裹体
碱性岩浆
热液沸腾
矿床成因
Donghuofang gold deposit, fluid inclusion, alkaline magma, hydrothermal boiling
