摘要
西藏东部玉龙铜矿带，包括玉龙、扎拉尕、莽总、多霞松多和马拉松多等斑岩型Ｃｕ，Ｍｏ，Ｐｂ，Ｚｎ，Ａｕ，Ａｇ和Ｐｔ等多金属矿床．由于分析技术条件的限制，前人所获得的含矿斑岩微量元素数据精度较低．采用先进的ＰＥＥｌａｎ６０００型电感耦合等离子质谱仪（ＩＣＰ－ＭＳ）分析微量元素（包括稀土元素），结果表明含矿斑岩和共生的钾质碱性深成岩、火山岩和煌斑岩在时空上具一致性，岩石化学成分均富碱（ｗ（Ｋ２Ｏ）＋ｗ（Ｎａ２Ｏ）＞８％），高钾和ｗ（Ｋ２Ｏ）／ｗ（Ｎａ２Ｏ）比值远大于１，微量元素富集Ｓｒ，Ｂａ等大离子亲石元素和轻稀土元素等，均显示出钾玄岩系列岩石的特征。
The multi_metallic deposits of Cu, Mo, Pb, Zn, Au, Ag and Pt etc. of the porphyry types are found from Yulong, Zhalaga, Mangzong, Duoxiasongduo and Malasongduo of the Yulong copper ore belt in the Eastern Tibet. The former study of the trace elements of ore_bearing porphyry did not present accurate data in the published literature, owing to the limitation of the past analytical techniques. The trace elements (include REE) analysis in this paper uses ICP_MS of PE Elan 6000 type. The analytical results show that the ore_bearing porphyry and coexisting potassic alkaline plutons rocks, volcanic rocks and lamprophyres have the same temporal_spatial distribution, uniform in the petrochemical compositions with alkali_rich ( w (K 2O+Na 2O)>8%), high potassium and w (K 2O)/ w (Na 2O)>1, and a strong enrichment in LILE of Sr, Ba etc. and LREE. This shows the characteristics of the shoshonitic series rocks, indicating the ore_bearing porphyry of the Yulong copper ore belt in Eastern Tibet belongs to the typical porphyry of the shoshonitic series.
出处
《地球科学（中国地质大学学报）》
EI
CSCD
北大核心
1998年第6期557-561,共5页
Earth Science-Journal of China University of Geosciences
基金
中国科学院重大项目
中国科学院重点B项目
关键词
元素地球化学
含矿斑岩
铜矿带
铜矿床
钾玄岩
element geochemistry
ore_bearing porphyry
Yulong copper ore belt
Eastern Tibet.
