摘要
通过宁镇地区燕山期矽卡岩矿床成矿系统的稀土元素特征研究,了解了矽卡岩矿床成矿系统的稀土元素地球化学演化规律特征及其制约机制,为矽卡岩型多金属矿床成矿规律及成矿预测研究提供新的地质地球化学信息依据。研究表明,矽卡岩矿床成矿系统稀土演化规律为:矽卡岩期,干矽卡岩阶段到湿矽卡岩阶段稀土组分含量增加;矽卡岩期晚期到热液期早期降低;热液期,汽成热液氧化物阶段到高中温硫化物阶段增加,到中低温硫化物阶段降低。演化规律主要是受自身富集稀土元素的强度、流体含矿性、运移分配及成矿的物理化学条件的影响。矽卡岩矿床成矿系统主要矽卡岩化的发育及其分带性所具有成矿专属性等特点,都为进一步寻找矽卡岩型多金属矿床提供新的地质地球化学信息。
Based on the study of REE geochemistry of Yanshanian ore-forming system in Ningzhen deposit,this paper discussed the rules of REE geochemistry evolution and its restrictive mechanism provided the REE geochemistry basis for polymetal skarn deposit evolution and prospecting.The rules of REE geochemistry evolution showed that in the skarn period,from anhydrous skarn stage to hydrous skarn-magnetite stage,REE composition was on the increase,and from late skarn stage to early hydrothermal stage it was on the decrease.And in the hydrothermal period,from steamed oxides stage to high and medium temperature sulfides stage,it was on the increase,while to medium and low temperatures sulfides stage,it was on the decrease.The REE geochemistry evolution was mainly affected by rare earth enrichment,ore potentiality,migration and distribution of ore-forming fluid,and changes in physico-chemical conditions.The metallogenic specialisation characteristic of skarn development and zonality provided geology and REE geochemistry basis for polymetal skarn deposit prospecting.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2010年第5期626-632,共7页
Journal of the Chinese Society of Rare Earths
基金
江苏省财政补助地勘项目(苏国土资发[2006]287号)资助
关键词
矽卡岩矿床
多金属矿
成矿机理
稀土元素
聚类分析
skarn deposit
polymetallic ore
minerogenetic mechanism
REE
cluster analysis
