锂辉石在花岗质熔体中溶解度及其成矿意义  

The solubility of spodumene in haplopgranitic melts and its mineralization implication

作　　者：徐雨生 唐勇[1] 张辉[1] 吕正航[1] XU YuSheng;TANG Yong;ZHANG Hui;LüZhengHang(Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院地球化学研究所,地球内部物质高温高压院重点实验室,贵阳550081 [2]中国科学院大学,北京100049

出　　处：《岩石学报》2024年第2期615-622,共8页Acta Petrologica Sinica

基　　金：国家自然科学基金重点项目(91962222);面上项目(42173043);2019年贵州省补助资金(GZ2019SIG、GZ2021SIG)联合资助。

摘　　要：本次研究利用快速淬火高温高压实验装置,在100MPa和650~850℃条件下,开展了锂辉石在简单花岗质熔体中溶解度及其影响因素的高温高压实验。实验结果表明温度是影响锂辉石在简单花岗质熔体中溶解度最为重要的因素,其次为铝饱和指数(ASI),而熔体的Na/K比值对锂辉石的溶解度几乎没有影响。结合已有的数据,建立了锂辉石溶解度与温度、铝饱和指数的关系:logLi_(2)O(%)=-0.61×(1000/T)+0.53×ASI+0.10,R^(2)=0.60其中T为绝对温度。该关系式可以用来量化锂辉石的结晶温度或评价花岗伟晶岩的成矿潜力。本次研究结果表明,伟晶岩矿床中锂的成矿潜力受限于初始岩浆中锂的含量和伟晶岩的结晶温度。This study conducted high-temperature and high-pressure experimental studies on the solubility and influencing factors of spodumene in haplogranitic melts using a rapid quenching high-temperature and high-pressure experimental device under conditions of 100MPa and 650~850℃.These results indicate that temperature is the most important factor affecting the solubility of spodumene in haplogranitic melts,followed by aluminum saturation index.The Na/K ratio of the melt has almost no effect on the solubility of spodumene.Based on existing data,establish the relationship between the solubility of spodumene and temperature,aluminum saturation index(ASI):logLi_(2)O(%)=-0.61×(1000/T)+0.53×ASI+0.10,R^(2)=0.60Where T is the in Kelvin temperature.This relationship can be used to quantify the crystallization temperature of spodumene or to evaluate the mineralization potential of granitic pegmatites.The results of this study indicate that the mineralization potential of lithium in pegmatite deposits is limited by the lithium content in the initial magma and the crystallization temperature of the pegmatite.

关 键 词：高温高压实验 溶解度 锂辉石 伟晶岩 

分 类 号：P578.954[天文地球—矿物学] P588.131[天文地球—地质学] P589.1