地质学报2013，Vol.87Issue(5)：691-702,12.
长江中下游马头斑岩型钼铜矿床常量元素、稀土元素特征及迁移规律
Characteristic and Migration Regularity of Major Elements and REEs in Matou Porphyry Mo-Cu Deposit in the Middle-Lower Reaches of Yangtze River
摘要
Abstract
The Matou porphyry Mo-Cu deposit of Anhui province is a typical porphyry ore deposit in the metallogenic belt of the Middle-Lower Reaches of Yangtze River.The mineralization can be classified spatially into three distinct types of alterations:potassic,phyllic and propylitic.This paper investigated the migration regularity of major elements and the characteristic of REE for three different alteration zones.①The major elements migrated obviously from potassication belt and sericitization belt into propylitization belt.Introduction of K2O,CaO,SiO2,TiO2 and H2O+ suggests that the liquids contained abundant K2O,CaO etc,and distinct loss of Na2O,FeO and MnO implies that mineralization led to major components as Na2O and FeO move away from the ore body,with distinct loss of Na2O,especially Na2O shows negative relation with Mo and Cu.②The REE curves assume a rightly dipping REE pattern,the enrichment of LREE and the losses of HREE.The mass migration calculation for REE demonstrates the fractionation of REE occurred in the process of mineralized alteration and REEs were increasing gradually from potassication zone to propylitization zone.③The REE distribution patterns of the samples show that the fresh granodiorite porphyry has the similar curve as altered country rocks,indicating that ore-forming material derived mainly from granodiorite melt,ahd probably with seawater involved.Based on the values of δEu and δCe,and the ratio relation between Fe2 O3 and FeO,it can be concluded that the oxygen fugacity was gradually increasing in porphyry fluid and the mineralization environment evolved to an oxidation environment from relatively reduction environment.④ Except for immobile Al2 O3 and TiO2,major elements and REEs migrated in various degree during mineralized alteration.The characteristics of enrichment and depletion and migration regularity are very different.关键词
马头钼铜矿床/常量元素/稀土元素/迁移规律/长江中下游Key words
Matou porphyry Mo-Cu deposit/major elements/REE/migration regularity/the Middle-Lower Yangtze Valley引用本文复制引用
艾金彪,马生明,朱立新,樊连杰,胡兆鑫,席明杰..长江中下游马头斑岩型钼铜矿床常量元素、稀土元素特征及迁移规律[J].地质学报,2013,87(5):691-702,12.基金项目
本文为国土资源部公益性行业科研专项(编号201111008)资助的成果. （编号201111008）
