富氟花岗岩体系岩浆流体内稀土元素演化规律的实验研究

富氟花岗岩体系岩浆流体内稀土元素演化规律的实验研究

李福春1 2, 朱金初2, 漆亮3, 饶冰2, 潘根兴1

1. 南京农业大学资源与环境科学学院，江苏南京 210093; 2. 南京大学地球科学系，成矿作用国家重点实验室，江苏南京 210093; 3. 中国科学院地球化学研究所，贵州贵阳 550002

收稿日期:2002-03-20 修回日期:2002-03-20 出版日期:2002-03-20 发布日期:2002-03-20

Experimental Study on Evolution of REE in Magmatic Fluid Phase in the F．Rich Granite System

LI Fu-chun1 2, ZHU Jin-chu2, Qi Liang3, RAO Bing2, PAN Gen-xing1

1. College of Resource and Enironment Science, Nanjing Agricultural University, Nanjing 210095, China; 2. Department of Earth Sciences and State Key Labortaory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China;3. Institute of Geochemistry, Chinesse Academy of Sciences, Guiyang 550002, China

Received:2002-03-20 Revised:2002-03-20 Online:2002-03-20 Published:2002-03-20

摘要/Abstract

摘要： 高温高压实验结果表明，随着富氟过铝花岗质岩浆分离结晶作用的进行，在与熔体相共存的流体相中，REE浓度呈有规律地变化：当温度从750℃下降至接近固相线（570℃）时，流体相中REE浓度逐渐降低，这一规律与REE在稀有金属花岗岩体上部岩相带中REE含量贫化的地质事实相一致。在富氟过铝质花岗岩体系中，REE易于分散进入某些造岩矿物（如黑云母等）和副矿物（如萤石和锡石等）中，从而不利于REE形成热液矿床。

Abstract: Experiments of fractional crystal1ization under high T-P conditions demonstrate that during crystallization of F-bearing alumina-oversaturated granitic magma,an evolutional trend of REE concentrations in fluid phabe coexisting with melt phase is observed： When temperature drops from 750℃ down to solidus(about 570℃)，the REE concentrations gradually decrease. This phenomenon is consistent with the geological fact that REE contents in the upper zones of rare-metal granites are lower than in the deeper zones ．REE mostly tend to disperse in some rockforming minerals(such as biotite)and some ore-forming minerals(such as fluorite and cassiterite)．The rest of REE partition into fluid phase．The evolution characteristics of REE in the F-rich alumina-oversaturated granite system are not favorable for forming hydrothermal deposits of REE.

李福春 , 朱金初, 漆亮, 饶冰, 潘根兴. 富氟花岗岩体系岩浆流体内稀土元素演化规律的实验研究[J]. J4.

LI Fu-chun1 2, ZHU Jin-chu2, Qi Liang3, RAO Bing2, PAN Gen-xing1. Experimental Study on Evolution of REE in Magmatic Fluid Phase in the F．Rich Granite System[J]. J4.