广西大厂超大型锡多金属矿床同位叠加成矿作用

大厂矿田各地质历史时期地质环境条件以及矿床地质、地球化学特征的研究分析表明，１００ 号矿体是大厂矿田内层状、脉状两种基本矿化类型之外的独特类型，可称为块状矿化类型，属有机成矿成因。大厂矿田成矿元素多、品位富、规模特大的原因在于古老基底Ｓｎ 等成矿元素预富集作用、泥盆纪热水沉积成矿作用、有机成矿作用、燕山期花岗岩浆热液成矿作用等不同时代、不同性质的多种成矿作用在特定空间部位叠加。

ISOSPATIAL SUPERIMPOSED METALLOGENESIS OF THE DACHANG SUPERLARGE TIN-POLYMETALLIC ORE DEPOSIT

Based on the studies on geological environment and geochemistry of the Dachang tin-polymetallic deposit, the No.100 orebody is thought of as a special kind of mineralization beyond the bedded and vein ores, named as massive mineralization by organism. The isospatial superimposed metallogenesis, including enrichment of Sn and other ore-forming elements in basement, sedimentary exhalative metallization and organogenic metallization in Devonian, magmatic hydrothermal mineralization in Yanshannian orogeny, are responsible for the forming of such a super large deposit with high tenor.