植物蛋白石的发光和测温研究

IF 1.7 2区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Joel Q.G. Spencer , David C.W. Sanderson , Mikaela Rader , Scott K. Fitzgerald , Charlie L. Rex , Myroslav Sprynskyy , Richard A. Staff
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引用次数: 0

摘要

我们研究了植物蛋白石的发光特性,以评估它们是否适合用于确定土壤和沉积物序列中的年龄和/或温度信息。这项研究对从冲积阶地采集的样品中与石英颗粒平行的 2.37 gcm-3 密度部分进行了检测。我们观察到植被石部分的光激发发光(OSL)与石英相似,热发光(TL)的峰值更宽,且在更高温度下具有连续性。扫描电子显微镜(SEM)数据表明存在蛋白石碎块和杂质矿物。为了更好地了解蛋白石植物碎屑的发光情况,我们分析了一系列生物源材料,包括非常纯净的硅藻、植物碎屑和石英参考材料。我们在所有分析材料中都观察到了灵敏度较低但可测量的 OSL 信号,在一些纯度较高的材料中观察到了红外激发发光(IRSL)信号,其快速衰减率超过了更典型的长石信号。TL 信号与在玻璃中观察到的信号相似,表明剂量反应可能超出石英饱和水平。对 OSL 剂量反应的初步研究表明,蛋白石植物岩石样本和所有其他分析过的生物硅材料都具有很好的生长特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Luminescence and thermometry studies of plant opal phytoliths

Luminescence and thermometry studies of plant opal phytoliths

We have investigated the luminescence properties of plant opal phytoliths to assess their suitability for determination of age and/or thermometric information from soil and sediment sequences. This study examined a <2.37 gcm−3 density fraction in parallel with quartz grains from samples collected from alluvial terraces. We observed comparable optically stimulated luminescence (OSL) from the phytolith fraction to the quartz, and thermoluminescence (TL) with broader peaks and continuum to higher temperatures. Scanning electron microscopy (SEM) data suggested the presence of opal clasts and contaminant minerals. To better understand the luminescence from opal phytoliths we analyzed a suite of biogenic materials including very pure diatoms, phytoliths, and quartz reference materials. We observe low sensitivity but measurable OSL signals in all the materials analyzed, and infrared stimulated luminescence (IRSL) signals with fast decay rates exceeding those of more typical feldspars in some of the purer materials. TL signals are similar to those observed for glasses and suggests dose response might extend beyond quartz saturation levels. Preliminary investigations of OSL dose response show very promising growth characteristics for opal phytolith samples and all other biogenic silica materials analyzed.

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来源期刊
Quaternary Geochronology
Quaternary Geochronology 地学-地球化学与地球物理
CiteScore
4.40
自引率
22.20%
发文量
130
审稿时长
20 weeks
期刊介绍: Quaternary Geochronology is an international journal devoted to the publication of the highest-quality, peer-reviewed articles on all aspects of dating methods applicable to the Quaternary Period - the last 2.6 million years of Earth history. Reliable ages are fundamental to place changes in climates, landscapes, flora and fauna - including the evolution and ecological impact of humans - in their correct temporal sequence, and to understand the tempo and mode of geological and biological processes.
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