Characteristics of fission tracks in zircon: applications to geochronology and cosmology
Characteristics of fission tracks in zircon: applications to geochronology and cosmology
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锆石裂变径迹的特征：在地质年代学和宇宙学中的应用
DOI：
10.1016/0012-821x(74)90063-6
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
D. Macdougall
中科院分区：
文献类型：
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作者：
S. Krishnaswami;D. Lal;N. Prabhu;D. Macdougall
本文介绍了一种简单的方法，用于近各向同性显示锆石裂变径迹。蚀刻剂是48% HF和98% H2SO 4的等体积混合物;蚀刻在150°-180 °C的压力下进行。当化石径迹密度大于105 × 106时，蚀变时间与径迹密度呈显著负相关。总的可蚀刻裂变碎片径迹长度（2个碎片）为11 ± 0.5 μm。长度分布呈尖峰状，不同样品的标准偏差为±（0.7 ~ 0.8）μm。热退火的研究表明，较低的激活能的轨道衰落比以前报道的使用磷酸蚀刻剂。本文介绍了一种从岩石样品中定量回收锆石晶体的实用化学溶解法，该方法可用于贫锆石岩石的裂变径迹定年。
We describe a simple method for nearly isotropic revelation of fission tracks in zircon. The etchant is an equivolume mixture of 48% HF and 98% H2SO4; etching is carried out under pressure at 150° – 180°C. For fossil track densities above ∼ 5 × 106, the etching time is strongly anticorrelated with track density. The total etchable fission fragment track length (2 fragments) is 11 ± 0.5 μm. The length distribution is sharply peaked; the standard deviation in different samples is ± (0.7 – 0.8) μm. Thermal annealing studies indicate a lower activation energy for track fading than was previously repoted using a phosphoric acid etchant. A practical chemical dissolution method is described for quantitatively recovering zircon crystals from rock samples; this method should find application in fission track dating of even zircon poor rocks.