摘要
钨是一种工业用途广泛的稀有金属,主要产于热液型矿床。确定钨元素迁移和沉淀的物理化学条件对于揭示热液型钨矿床的形成机制具有重要意义。本文应用新型热液金刚石压腔(HDAC-VT)开展了(Fe,Mn)WO_4-Li_2CO_3-H2O体系的原位观测结晶实验,9组实验结果表明,黑钨矿晶体的结晶温度集中在560~500℃,结晶压力主要集中在400~200MPa。黑钨矿的溶解度随体系内CO_2组分相对含量的增加而增加;碳酸锂的结晶导致CO_2组分的减少,诱发黑钨矿的快速结晶,这指示出CO_2组分对钨的迁移和沉淀具有重要作用。含矿流体中CO_2组分的散逸可能是黑钨矿沉淀富集成矿的重要因素之一。
Tungsten, as a kind of widely used rare metal in industry, is mainly from hydrothermal deposits. It is important to determine the physicochemical conditions of transport and deposition of W for revealing the formation mechanism of hydrothermal W deposit. Crystallization experiments were conducted in a hydrothermal diamond anvil cell （HDAC-VT） using （Fe, Mn） WO4-Li2 CO3-H2O as starting materials. The results of nine experiments performed indicate that the temperature and pressure of wolframite crystallization mostly vary from 560 ~C to 500 ~C, from 400 MPa to 200 MPa, respectively. There is significant dependence of the solubility of wolframite on relative amount of Li2 CO3. The decrease of CO2 component caused by the crystallization of zabuyelite resulted in quick crystallization of wolframite. The results indicate that carbon dioxide plays an important role in the transport and deposition process of tungsten. Dissipation of COz component is probably one of the important factors which may induce the precipitation and enrichment of wolframit
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2017年第5期159-166,共8页
Earth Science Frontiers
基金
国家重点研发计划课题(2016YFC0600204
2016YFC0600208)
国家自然科学基金项目(41372088)
国土资源部公益性行业科研专项(201411050)
中央级公益性科研院所基本科研业务费专项基金项目(K1409)
中国地质调查局地质调查项目(DD20160056
DD20160055)
关键词
热液金刚石压腔
结晶实验
黑钨矿
CO2组分
hydrothermal diamond anvil cell
crystallization experiment
wolframite
CO2
