论文部分内容阅读
石英中Ｋ含量极低，而且一般含有包体成分（气相、液相或固相）的干扰，用常规Ｋ—Ａｒ稀释法很难测定其同位素地质年龄。采用４０Ａｒ／３９Ａｒ快中子活化定年法，通过石英中３９Ｋ（ｎ·Ｐ）３９Ａｒ核反应，把微量Ｋ的化学分析转化为３９Ａｒ静态质谱法测定，从样品挑选、样品用量、照射时间、实验流程、质谱分析及数据处理诸环节严格把关，使Ｃｌ和过剩Ａｒ的干扰降低到最小限度，就能得到比较可靠的年龄数据，进而获得含金石英脉的成矿时代。
Quartz K content is extremely low, and usually contains inclusions (gas, liquid or solid phase) interference, using conventional K-Ar dilution method is difficult to determine the isotopic geological age. The 40Ar / 39Ar fast neutron activation dating method is adopted to convert the chemical analysis of trace K to 39Ar static mass spectrometry through the 39K (n · P) 39Ar nuclear reaction in quartz. From the sample selection, the sample dosage, the irradiation time, the experimental procedure, Mass spectrometry and data processing all aspects of strict control, so that the interference of Cl and excess Ar reduced to a minimum, we can get more reliable age data, and then get the gold-bearing quartz vein mineralization era.