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首页> 外文期刊>Planetary and space science >Induced thermoluminescence as a method for dating recent volcanism: The Blue Dragon flow, Idaho, USA and the factors affecting induced thermoluminescence
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Induced thermoluminescence as a method for dating recent volcanism: The Blue Dragon flow, Idaho, USA and the factors affecting induced thermoluminescence

机译：诱导热致发光作为最近火山的约会方法：蓝龙流，爱达荷，美国和影响诱发热敏发光的因素

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In order to continue our investigation into the possible utility of induced thermoluminescence as a chronometer for volcanic activity we have measured the induced thermoluminescence properties of twenty-eight samples collected from the almost 3 km long Blue Dragon flow at Craters of the Moon National Monument and Preserve, Idaho. The properties of the samples are consistent with previous conclusions that the major mineral causing the luminescence is feldspar and that variation in the glow curves (light emitted as a function of heating temperature) is caused by variations in the thermal history of the samples. However, in nine of the 28 samples a there is a significant contribution to the TL signal from apatite. The induced thermoluminescence level along the flow is essentially constant, showing at most a factor of four decrease from beginning to the end (from similar to 16 to similar to 4, on a scale of the Dhajala meteorite = 1000), and this is not statistically significant. Thus sampling distance from the vent should not be a problem for the proposed TL dating method. However, there are details that might pose a problem for dating. (1) There is considerable (factor of 10 or so) scatter in the TL data due to the high heterogeneity of the samples. (2) There are abundant highly luminescent spherules which could explain some of the scatter; however, they are restricted to samples taken very close to the vent and could be screened from TL samples using cathodoluminescence, a microscopic means of identifying components producing the TL. (3) There is a factor of three increase in crystallization along the core (from similar to 20 vol% to similar to 60 vol%) but no factor of three increase in induced TL value. This is additionally problematic because crystallization is accompanied by a small decrease in anorthite content of the feldspar which should further increase induced TL values. While empirical data suggest that there is a weak correlation between induced TL and age for volcanics from Idaho and Hawaii, our detailed study of the Blue Dragon flow removes one complication for the dating method but reveals many details that need to be kept in mind as this possible dating method is explored. Most importantly, we need a method for reducing the scatter in induced TL displayed by samples from a single volcanic eruption.
机译：为了继续研究诱导热致发光的可能效用，作为火山活性的计时器，我们测量了从月亮国家纪念碑和保护陨石坑的近3公里长的蓝龙流量收集的二十八个样本的诱导热致发光性质，爱达荷州。样品的性质与先前的结论是，导致发光的主要矿物是长石，并且发光曲线的变化（作为加热温度的函数发出的光）是由样品热历史的变化引起的。然而，在28个样品中的九个中，对来自磷灰石的TL信号存在显着贡献。沿着流动的诱导的热致发光水平基本上是恒定的，最多显示从开始到末端的四个减少（从类似于16到相似到4，在Dhajala Meteorite = 1000的等级上），这不是统计学重大。因此，从通风口的采样距离不应该是所提出的TL约会方法的问题。但是，有些细节可能会对约会提出问题。 （1）由于样品的高异质性，在TL数据中存在相当大的（因子10左）散射。 （2）有丰富的高发光球，可以解释一些散射;然而，它们仅限于非常接近通气孔的样品，并且可以使用阴极发光从T1样品中筛选，这是识别产生T1的组分的微观方法。 （3）沿着核心结晶三次增加（从20体积％到类似于60体积％），但诱导的T1值不增加3种。这是另外问题的，因为结晶伴随着长石的钙质含量的小降低，这应该进一步增加诱导的T1值。虽然经验数据表明，Idaho和夏威夷的火山诱导的TL和年龄之间存在较弱的相关性，但我们对蓝龙流的详细研究除以约会方法的一个复杂性，但揭示了许多需要保持牢记的细节探索可能的数据方法。最重要的是，我们需要一种用于从单个火山喷发的样本显示的诱导T1中的散射的方法。

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