石榴子石冷却速率计的误差分析

Error-Analysis of the Garnet Geospeedometry

对石榴子石冷却速率计中的几个重要参数误差分析结果表明,在慢速冷却的情况下.由测量数据误差所致的偏差可以忽略不计。但当冷却速率较大时,误差对模拟结果的影响则非常显著。然而,若采用现代分析仪器,由定位导致的模拟误差也可以完全忽略。空间测量的偏差往往使模拟得到的岩石冷却速率比实际值小得多;初始温度估计的偏差会使模拟结果产生很大的变化;扩散系数的选择对模拟结果影响也颇大。因此, 具体情况下需仔细选取那些实验条件与所研究的具体地质情况最为相似的实验数据得到的模拟结果才是合理的。只有在合理的计算和选取参数以及可靠的测试技术的情况下,得到的模拟结果才具有地质意义。

Error analysis is applied to evaluate the influence of several important parameters of the garnet geospeedometry in this study. It shows that errors of the modeling results of the garnet geospeedometry caused by errors of those measured parameters would be very small when the cooling rate of the garnet was very small, whereas they would be obviously big when the cooling rate was quite big. At present, errors caused by the repositioning are very small when modern instruments were applied for anal-ysis. However, the error of those measured parameters could result in that the rock cooling rate obtained through modeling is much smaller than that should be. Thus, the errors of the estimated initial temperature of the system could cause a big error for the modeling results. The selected diffusion parameters also could cause some variations for the modeling results. Therefore, only the modeling results, which were calculated by using the proper experimental results obtained under the experimental condition approximately similar to the geological facts, properly selected parameters, and all the relevant data measured by reliable and accurate measurements, could have proper and specific geological meaning.