摘要
乳山金矿床位于牟平—乳山金矿带中部,产于昆嵛山花岗岩体中部,是胶东近年来探明的重要金矿床之一。在地质和地球化学方法综合研究基础上提出乳山金矿床属于石英脉型金矿床,是由中生代壳源深熔花岗岩岩浆期后中温热液作用形成的;矿石中金以碲金银矿、银金矿、自然金等形式产在黄铁矿及裂隙中,其物质来源于太古界胶东群地层。
The Rushan gold deposit, one of the recently-proven large gold deposits in east handong, lies in the central part of the Muping-Rushan gold metallogenic belt. Based on esearch work in such aspects as regional geology, ore deposit geology, wall rock alterations, re types, ore minerals, ore-forming stages, thermometry and gas-liquid composition of nclusions in quartz, and hydrogen-oxygen isotopic geochemistry, the author has reached the ollowing conclusions: 1. The Rushan gold deposit is a postmagmatic mesothermal pyrite quartz-ein type gold deposit related to Mesozoic Kunyushan granite. 2. The ore-control structure is a ompound structure formed by two sets of faults trending respectively N 15°E and N 65°E.3. rom potassic alteration to the formation of siderite quartz veins, the ore-forming process xperienced four stages, in which the formation of pyrite quartz veins and phyllic rock seemed o be the major stage whose formation temperature, pressure and oxygen fugacity (log fo_2) eing 95～311℃, 7.58×10~4～7.77×10~4 KPa and —33.3～—35 respectively.4. The ore-forming ubstances were derived from Jiaodong Group, and the weak acid ore-forming hydrothermal olutions rich in Fe+2, SO_4^(-2), HCO_3and CO_2 evolved from postmagmatic weak alkaline ydrothermal solutions rich in K^+, Na^+ and C1.5. Gold occurs in pyrite and its cracks as icrograined native gold, electrum and petzite, associated with altaite and tellurobismuthite.
出处
《矿床地质》
CAS
CSCD
北大核心
1992年第2期165-178,共14页
Mineral Deposits
基金
国家自然科学基金
