Statistical modelling of annealing kinetics of fission tracks in zircon; Reassessment of laboratory experiments
Statistical modelling of annealing kinetics of fission tracks in zircon; Reassessment of laboratory experiments
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DOI：
10.1016/j.chemgeo.2006.09.002
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发表时间：
2007-01-15
期刊：
影响因子：
3.9
通讯作者：
Tagami, Takahiro
中科院分区：
文献类型：
--
作者：
Yamada, Ryuji;Murakami, Masaki;Tagami, Takahiro
我们对锆石中裂变径迹（FTs）的退火动力学进行了改造，以拟合三篇早期出版物中43个实验室实验的数据，这些数据使用了来自尼萨泰英安岩的锆石中的自发裂变径迹长度。加热温度和时间分别在350 - 912℃和10⁻³ - 10⁴小时的范围内。这些数据集说明了在某个温度区域退火过程的转变。为了以更好的拟合优度来表达涉及可能的转变过程的退火行为，构建了两种模型：混合 - 线性模型，它由高温下的扇形 - 线性模型和低温下的平行 - 线性模型组成，并通过一个转变温度区域连接；以及平行 - 曲线模型，它能平滑地近似退火过程中的转变。通过与一些深钻孔岩芯数据的比较，证实了该模型外推到地质时间尺度的有效性。混合 - 线性模型的长度估计与钻孔数据吻合良好，而平行 - 曲线模型的估计与高度退火的钻孔样品存在显著差异，尽管该模型与实验数据吻合良好。对于混合 - 线性模型，对应于10⁶年和10⁷年等温加热的部分退火区域的估计值为281 - 352℃和262 - 330℃，其中部分退火区域的顶部和底部分别由平均长度减少率0.4和0.8定义。（c）2006爱思唯尔有限公司。保留所有权利。
We remodel the annealing kinetics of fission tracks (FTs) in zircon to fit data from 43 laboratory experiments in three earlier publications using spontaneous FT lengths in zircon from the Nisatai Dacite. Heating temperature and time are in the ranges of 350-912 degrees C and 10(-3)-10(4) h, respectively. The data sets illustrate a transition in annealing process at a certain temperature zone. In order to express the annealing behavior involving the possible transitional process with improved goodness of fit, two types of models are constructed; the hybrid-linear model that consists of the fanning-linear model at high temperature and the parallel-linear model at low temperature, connected with a transitional temperature zone, and the parallel-curvilinear model that approximates smoothly the transition in the annealing process. The validity of the extrapolation of the model to geological time scale is confirmed by comparison with some deep borehole core data. The length estimates by the hybrid-linear model agree well with the borehole data, whilst the estimates by the parallel-curvilinear model show a significant disagreement with highly annealed borehole samples although this model provides good agreement with the experimental data. For the hybrid-linear model, estimates of the partial annealing zone corresponding to isothermal heating for 106 and 107 years are 281-352 degrees C and 262-330 degrees C where the top and bottom of the partial annealing zone are defined by the mean length reduction ratio of 0.4 and 0.8, respectively. (c) 2006 Elsevier B.V. All rights reserved.