Variations of Thermally and Optically Stimulated Luminescence Sensitivity of Loess and Pedocomplex Samples from Southern Tajikistan, Central Asia

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Geochronometria Pub Date : 2020-04-29 DOI:10.1515/geochr-2015-0118

Yuetian Li, Liping Zhou

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引用次数: 5

Abstract

Abstract To better understand the factors controlling the quartz luminescence sensitivity in loess deposits, samples from two loess sections in southern Tajikistan are investigated. Both pattern and amplitude in the variations of quartz luminescence sensitivity of these two sections are similar, showing higher values in pedocomplex units and lower values in the loess units. Similar trends of variation are found between the quartz luminescence sensitivity and climate proxies, including frequency-dependent magnetic susceptibility, median grain size and IRSL/[post-IR] OSL ratio. Laboratory experiments involving thermal activation and repeated bleaching/irradiation cycles reveal much larger sensitivity enhancement for samples with initial lower sensitivity from loess units than those from pedocomplex units with higher sensitivity. The observed systematic contrast in quartz luminescence sensitivity between the loess and pedocomplex units are interpreted as resulting from the differentiation of the weathering products from the source area and subsequent sensitization during the sedimentary transfer prior to deposition.

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中亚塔吉克斯坦南部黄土和土壤复合体样品的热光敏感性变化

摘要为了更好地了解黄土沉积物中石英发光敏感性的控制因素，对塔吉克斯坦南部两个黄土剖面的样品进行了研究。两个剖面的石英发光灵敏度变化模式和幅度相似，均表现为土壤复合体单元较高，黄土单元较低。石英发光敏感性与气候指标(包括频率相关磁化率、中值粒度和IRSL/[后ir] OSL比)之间也存在类似的变化趋势。包括热活化和重复漂白/辐照循环在内的实验室实验表明，黄土单元中初始灵敏度较低的样品的灵敏度要比灵敏度较高的土壤复合体单元的样品的灵敏度提高得多。观测到的黄土与土壤复合体单元石英发光敏感性的系统对比可以解释为源区风化产物的分异和沉积转移过程中沉积前敏化的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geochronometria 地学-地球科学综合

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Geochronometria is aimed at integrating scientists developing different methods of absolute chronology and using them in different fields of earth and other natural sciences and archaeology. The methods in use are e.g. radiocarbon, stable isotopes, isotopes of natural decay series, optically stimulated luminescence, thermoluminescence, EPR/ESR, dendrochronology, varve chronology. The journal publishes papers that are devoted to developing the dating methods as well as studies concentrating on their applications in geology, palaeoclimatology, palaeobiology, palaeohydrology, geocgraphy and archaeology etc.