特大型银矿床地质特征及找矿方向

特大型银矿床在资源占有量上占举足轻重的地位,使之已经成为近年来重要的研究课题之一.从已知的国内外特大型银矿床入手,在成矿时间、空间以及成矿特征方面进行了深入的研究.提出了特大型银矿床的主要成矿地质特征、矿床类型划分方案及在我国的找矿方向.概括如下:(1)已知特大型银矿床均分布于环太平洋成矿带内,主要受控于中生代、新生代的火山岩带和裂谷带之中,多数矿床与中酸性-酸性岩浆活动有关;(2)特大型银矿床以成矿系列为主要线索,划分为浅成低温热液型、斑岩型、矽卡岩型和5元素型;(3)中国在中新生代火山岩及裂谷发育地区,如大兴安岭-太行山带等,具有特大型银矿床的成矿潜力.

GEOLOGICAL CHARACTERISTICS AND PROSPECTING DIRECTIONS OF SUPER-LARGE SILVER DEPOSITS

Super large silver deposits play an important role in total resources of silver It is an important subject of study on silver deposits in recent years The author has studied mineralization,metallogenic epoch and mineralization places in detail,based on the characters of super lage silver deposits both in China and abroad. The author also discusses geological features,types and ore hunting directions of super large silver deposits All the super large silver deposits are occurred in circum Pacific metallogenic belt,and controlled by Mesozoic Cenozoic volcanic rock belts and rift zones They are related to acid or acid intermediate magmatic activity.Based on metallogenic systems,super large silver deposits may be classified into epithermal deposits,porphyry type,and quinary element deposits Mesozoic Cenozoic volcanic rock belts and rift zones are the best prospective areas for finding super large silver deposits in China,such as Daxinganling Taihangshang area