Short-term annealing characteristics of spontaneous fission tracks in zircon: A qualitative description
Short-term annealing characteristics of spontaneous fission tracks in zircon: A qualitative description
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DOI：
10.1016/j.chemgeo.2005.10.002
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发表时间：
2006-04
期刊：
影响因子：
3.9
通讯作者：
M. Murakami;R. Yamada;T. Tagami
中科院分区：
文献类型：
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作者：
M. Murakami;R. Yamada;T. Tagami
在短期（<4分钟）加热条件下，裂变径迹（FT）的热退火行为尚未被记录。我们在严格控制时间和温度的石墨炉中，对锆石在550-910°C下的自发傅立叶变换进行了一系列新的17个实验室加热实验，持续时间为4、10和100 s。ft在912°C、858°C和805°C分别退火3.9 s、10.4 s和100.6 s。这些结果表明，锆石中的ft在普通的假硅酸盐形成的时间-温度条件下（即在1000°C下5 s）完全退火。在加热~ 4和10 s时测量到的FT长度比以前的退火动力学模型预测的要短，这表明其中的退火速度更快。随着退火的进行，这些样品中的短径成分突然增加，这在较长时间的加热运行中没有观察到，包括以前的研究结果。在~ 4和10s的加热过程中，这种快速缩短是由较早出现的分割退火过程引起的。
Thermal annealing behavior of fission tracks (FT) has not yet been documented under short-term (<4 min) heating condition. We performed a new series of 17 laboratory heating experiments on spontaneous FTs in zircon at 550–910 °C for ∼4, 10 and 100 s under strict controls of time and temperature using a graphite furnace. FTs were almost completely annealed at 912 °C for 3.9 s, at 858 °C for 10.4 s and at 805 °C for 100.6 s. These results suggest that FTs in zircon are totally annealed at time–temperature conditions of ordinary pseudotachylyte formation (i.e. at 1000 °C for 5 s). The measured FT lengths in ∼4 and 10 s heating runs are shorter than that predicted by previous annealing kinetic models, suggesting a more rapid annealing therein. The component of short tracks in these samples increases suddenly as the annealing proceeds, which has not been observed for longer heating runs including the results of previous studies. Such rapid shortening for ∼4 and 10 s heating is caused by earlier emergence of the annealing process of segmentation.