(1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University,
Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China)
摘 要: 从矿床地球化学特征入手，对矿区的矶头复式岩株、1号矿体矿石、矽卡岩和矿体围岩(黄龙组和船山组的灰岩)的常量元素、稀土元素和微量元素特征进行探讨。结果表明：矶头复式岩株的闪长岩类岩石属于硅酸弱饱和类钙碱性准铝质岩石，其岩浆主要来源于上地幔，且在岩浆上升过程受到了地壳物质的混染；岩体中Cu元素强烈富集，岩浆具备提供成矿物质的潜力；1号矿体中的矿石稀土配分曲线、∑REE和6种常见成矿元素(W、Sn、Cu、Pb、Zn、Ag)含量均与岩体和矽卡岩的相近，而与黄龙组和船山组灰岩的相差较大。在此基础上，结合新桥铜硫铁矿床的控矿因素、岩体地球化学特征、矿石结构构造、围岩蚀变、矿石矿物分带特征、矿床地球化学特征、成矿物质来源以及与典型Sedex矿床和矽卡岩矿床的对比，得出岩浆是区内成矿的必要因素，新桥铜硫铁矿床应是以接触交代作用为主的矽卡岩型铜硫铁矿床。
关键字: 新桥；矿床地质特征；地球化学特征；控矿因素；矿床成因
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University,
Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China）
Abstract:The geochemical characteristics in macroelements, REE and trace elements of Orebody No.1, skarns and wall rocks (limestones in Huanglong Group and Chuanshan Group) were discussed. The results show that Jitou rock strains are weak silicate saturated, vice-metaluminous and calc-alkaline, originated from upper mantle and contaminated by crustal materials during digenetic evolution process. The element Cu in Jitou rock Strains is so rich that the magma has the potential to supply metallogenic substances, and the REE distribution curves, ∑REE and contents of six metallogenic elements (W, Sn, Cu, Pb, Zn, Ag) of ore in Orebody No.1 are similar to ones of Jitou rock strains and skarn, but different from ones of limestones in Huanglong Group and Chuanshan Group. On these basis, the genesis of the deposit was studied by analyzing ore-controlling factors, geochemical characteristics of Jitou rock strains, ore structures, alteration of wall rock, mineral zonation, geochemical characteristics of the deposit, source of ore-forming materials and comparison among typical Sedex type deposit, skarn type deposit and Xinqiao Cu-S-Fe deposit. The conclusions are that the magma is the necessary factor of the mineralization, and that Xinqiao Cu-S-Fe deposit is skarn-type Cu-S-Fe deposit because of its contact metasomatism.
Key words: Xinqiao; geological characteristics of deposit; geochemical characteristics; ore-controlling factors ; genesis of deposit
