洛金洼金矿床蚀变围岩稀土元素初步研究  

A PRELIMINARY STUDY ON ALTERED WALLROCK RARE EARTH ELEMENT AT LUOJINWA GOLD DEPOSIT

作　　者：别风雷[1] 徐九华[2] 贾继容 

机构地区：[1]中国地质大学,北京100083 [2]北京科技大学,北京100083 [3]华北石油勘探院

出　　处：《贵金属地质》2000年第1期39-43,共5页

基　　金：北京科技大学项目资助

摘　　要：平泉县洛金洼金矿床赋存于太古宇上迁西群变质岩系和花岗闪长斑岩及闪长玢岩等侵入体中 ,本文研究了该矿床蚀变围岩的稀土元素的地球化学特征 ,探讨了稀土元素的迁移富集与蚀变的关系 ,并讨论了与矿化的联系 .Luojingwa gold deposit in Pingqun,north east Hebei Province, is situated in the conjuction between Inner Mongolia axis of earth and Yanshanian subsidence zone of North China platform The gold deposit is a gold polymetallic sulfide one emplaced in the faults striking about south to north within the Archean metamorphic strata and magmatic intrusive massif The wallrocks of ore are mainly Archaeozoic metamorphic rocks of Qianxi group,granodiorite,monzophyre and diorite porphrite Wallrock alterations are dominated by sericitization,silicification,carbonation,chloritization and epidotization Overlapping pyritization are also found near the ore body The REE characteristics of diorite porphrite is of crust mantle granitoid The result of REE analysis of LV 3 vein reveals that REE were taken away during alteration The REE content variation is positively correlated to wallrock alteration intensity The REE distribution patterns are similar The mobility of REE increases as silicification gets stronger,The migration ability of LREE is stronger than that of HREE The ability of HREE entering wallrocks is powerful in cataclatic rocks with high gold content,which indicates our exploration

关 键 词：围岩蚀变 稀土元素 矿化作用 金矿床 

分 类 号：P618.510.5[天文地球—矿床学]