佛子冲火山岩区隐伏铜锌矿床的类型归属及成矿远景

佛子冲铅锌成矿带包括两种矿床类型,即佛子冲式夕卡岩型矿床和牛卫式热液充填（交代）型矿床,这两类矿床矿体产状,围岩蚀变,矿物组合,以及单矿物中微量元素分布特征等方面区别明显,但硫化矿物的硫,铅同位素组成相同,并且均表现出强烈的均一化的特点,反映出两者的成矿条件及成矿方式虽然不同,但具有相同的物源－燕山期钙碱性火山岩系,在佛子冲矿带南部火山岩覆盖区,铅锌矿化组合空间展布呈“三层楼”结构,并且构造控矿作用明显：矿点主要分布于佛子冲隐伏背斜的轴部（“龙脊”）,特别是在隐伏背斜被NE向断裂切割部位,火山岩铅锌矿化大多属于佛子冲式矿床类型,即佛子冲矿带内主要的矿床类型,具有较大的找矿前景。

THE TYPES OF HIDDEN LEAD-ZINC DEPOSITS AND THE EXPLORATION PROSPECT IN THE VOLCANIC COVER TERRAIN OF FUZICHONG BELT, SOUTHEASTERN GUANGXI, CHINA

There exist two type mineral deposits including Fuzichong-type skarn deposit and Niuwei-type hydrothermal filling deposit in the Fuzichong Pb-Zn ore belt. Those two type deposits show the dual characters of the difference (orebody occurrence, wallrock alteration, mineral assemblage, and trace element distribution in the sphalerite and galena, etc.) and the relativity (the same sulfur, lead isotopic composition, and strong isotopic homogenization). It is indicated that the mineralization conditions (e.g., mineralizing temperature, tectonic setting, etc.) and mineralization modes were different, but the mineral material sources were the same from the Yanshanian volcanism. In the volcanic covering terrain of southern Fuzichong belt, the Pb-Zn orebodies are distributed just like "Three Floors" construction, and the tectonic-controlled mineralization sites are mainly located on the axle of Fuzichong hidden anticline which looks like a "Dragon backbone", especially on the cross district of the NE trending fracture and the fold axle. Most of Pb-Zn deposits in the volcanic terrain belong to the Fuzichong type deposits that is the main type of the Fuzichong belt, therefore there is an excellent exploration prospect in the Fuzichong volcanic area.