Thermal annealing characteristics of fission tracks in natural zircons of different ages
Thermal annealing characteristics of fission tracks in natural zircons of different ages
复制标题
不同年龄天然锆石裂变径迹的热退火特征
DOI：
10.1111/ter.12394
复制
发表时间：
2019
期刊：
影响因子：
2.4
通讯作者：
Takahiro Tagami and Shunsuke Matsu’ura
中科院分区：
文献类型：
--
作者：
Fukuda Shoma;Sueoka Shigeru;Hasebe Noriko;Tamura Akihiro;Arai Shoji;Tagami Takahiro;Takahiro Tagami and Shunsuke Matsu’ura
锆石裂变径迹（FT）热年代学已被广泛应用于解决各种地质问题，对FT退火行为的理解是必不可少的。对不同年龄（0.6 ~70 Ma）和辐照损伤程度的天然锆石中的FTs进行了热退火实验。我们测量了从快速冷却的火山岩中分离出的9个锆石精矿在400-700°C下退火1小时后的水平限制径迹长度。随着退火温度的升高，所观察到的轨道在所有样品中显示出一致的和系统的长度减少，并且对于相同的退火步骤，在9个样品中几乎不能区分平均轨道长度。我们的研究结果表明，在实验室时间尺度上的热退火特征是一致的锆石，无论其年龄，和相同的退火动力学可能适用于晚中生代至新生代锆石。
Fission track (FT) thermochronometry using zircon has widely been applied to the resolution of a variety of geologic problems, for which the understanding of FT annealing behaviour is essential. Thermal annealing experiments were conducted on FTs in natural zircons having different ages (ranging from ~0.6 to ~70 Ma) and radiation damage levels. We measured horizontal confined track lengths on nine zircon concentrates separated from rapidly cooled volcanic rocks, after 1 hr annealing at 400–700°C. As the annealing temperature increases, the observed tracks show a consistent and systematic length reduction in all samples, and the mean track lengths are hardly distinguishable among the nine samples for the same annealing step. Our results suggest that the thermal annealing characteristics at laboratory time‐scale are concordant among the zircons, regardless of their ages, and that identical annealing kinetics may work for Late Mesozoic to Cenozoic zircons.