摘要
在温度为200—420℃,盐度为0—10wt％,填充度为50％的条件下,完成了由NaWO_4·2H_2O+FeCl_2·4H_2O或/和MnCl_2·4H_2O组成的水溶液在带黄金衬套的不锈钢高压釜中合成黑钨矿(钨锰矿或钨铁矿)的氧同位素分馏作用实验研究。我们获得的结果表明,在310℃条件下,黑钨矿和钨锰矿或钨铁矿与水之间氧同位素分馏作用几乎没有什么差别。在高温条件下(>370℃),黑钨矿与水之间氧同位素分馏值趋于相同,而在低温条件下(<870℃),随温度降低分馏值趋于增大。所获黑钨矿-水分馏方程式为: 1000 Inα_(黑钨矿-水)=0.21×10~6T^(-2)-2.91(370±—420℃) 1000 Inα_(黑钨矿-水)=1.03×10~6T^(-2)-4.91(200—370℃±)
An experimental investigation on oxygen isotope fractionation in the quartzwolframite-water system, in which wolframite (ferberite or huebnerite) was synthesized in aqueous solutions containing Na_2WO_4. 2H_2O+FeCl_2. 4H_2O and/or MnCl_2. 4H_2O, has been carried out in the temperature range from 200℃ to 420℃, in the salinity range from 0 to 10 equivalent wt％ NaCl and at 50％ of filling degree. Each experiment was conducted in a stainless-steel autoclave with gold lining, where about 50％ volume was held by starting materials. The experimental results indicate that there are no significant differences in the equilibrium isotope fraetionation between water and wolframite, ferberite and huebnerite at the same temperature (310℃). In addition, the equilibrium oxygen isotope 'fractionation factors of wolframite and H_2O trend to be equal with increasing temperature at high temperatures (>370℃), but increase significantly with decreasing temper ature at low-temperatures (<370℃).
Their fraetionation equations were expressed as the follows:
1000lnα_(wf)-H_2O=1.03×10~6T^(-2)-4.91 (370±-200℃)
1000lnα_(wf)-H_2O=0.21×10~6T^(-2)-2.91 (420-370℃±)
出处
《地质论评》
CAS
CSCD
北大核心
1991年第1期80-88,共9页
Geological Review
基金
国家自然科学基金(4860149)
