摘要
金山金矿是产于中元古界双桥山群浅变质岩系中的含金石英脉及蚀变岩型矿床,矿体受层间挤压破碎带及环形构造和放射状断裂的控制.通过对矿床产出的地质特征、矿区航片解译、矿化蚀变、微量元素地球化学、石英包裹体的成分和稳定同位素的研究测定,提出了矿床的成因与双桥山群德兴组合金岩系及热穹窿(隐伏岩体)有关.
Jinshan gold deposit is a large-scaled one situated in Jiangnan Geoanticline. It is located in the well known Dexing Cu - Au - Ag metallogenic delt which is controled by a deep fracture. The surrounding rock is Dexing Formation of Middle Proterozoic Shuang Qiaoshan Group. Ore bodies are strictly controled by ring fractures, radiate fractures and interformational fraetural zones. Ring fractures and radiate fractures are closely related to deep granitic pluton. This paper discusses mineralization characteristics and genesis of the deposit. The ore is with high fineness of native gold and some trace elements of Cu, As, Te and Bi. Co / Ni values are ranged as 0.43 - 1.11. Decrepitation and homogenization temperature of inclusions in quartz of Au - bearing quartz veins are ranged as 245° - 326° and 180-320℃ respectively. The calculated ore-forming pressure is 1000 bar. Ore-forming fluid is acidic to weak acidic (PH = 4.91 - 5.53) and charaterized by Ca (HCO_3)_2 - KaCl - MgSO_4. The range of S-isotope of S^(34) s + 3.5 - + 4.3‰, δDH_2O = 63.67 - - 58.06‰, δ^(18)O_(H_2O) = 7.67～10.4‰ imply a deep source of suffur, fluid as orgihal magmatic water superimposed by metamorphic water. Pb belongs to anormal one with values range of 8.62 - 8.78, w value range of 4.10-4.23 implying a near source. Rb-Sr isochron age is 167.9 ± 5.1 Ma belonging to the early Yanshanian Period and coinciding with that of Dexing porphry ore deposit and Yinshan poly-metal ore deposit.
出处
《地质找矿论丛》
CAS
CSCD
1990年第2期29-39,共11页
Contributions to Geology and Mineral Resources Research
