E1′中心长时间人工光学漂白在沉积物ESR定年中的应用

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

Geochronometria Pub Date : 2019-01-01 DOI:10.1515/geochr-2015-0106

Chuanyi Wei, Chun-ru Liu, Chang‐An Li, G. Yin, Yufen Zhang, Wenpeng Li, Lu-Peng Yu

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引用次数: 4

摘要

摘要:收集3个不同产地的石英样品进行ESR评价，以了解E1′中心在长时间尺度上的光学漂白特征。在人工阳光照射约400小时后，E1 '中心的白化水平稳步上升，约为其自然水平的2.5倍，并且不同样品来源的白化水平也表现出较小的变化。石英E1′中心自然信号强度的不断增加为其在沉积物物源追踪中的潜在应用提供了重要证据。结果表明，E1′中心的信号强度在开始84 h内呈上升趋势，202 h后呈下降趋势，与前人的预测一致。长时间暴露在阳光下后，辐照样品的剂量率与其E1′中心ESR信号强度无相关性。因此，没有新的方便的指示说明E1 '中心可能用于ESR沉积物定年。

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Application of long time artificial optical bleaching of the E1’ centre to sediment ESR dating

Abstract Three quartz samples extracted from different origins were collected for ESR evaluation to appreciate the optical bleaching characteristics of the E1’ centre in a long time scale. After exposure of about 400 hours to artificial sunlight, the E1’ centre were bleached to a steady increasing level, about 2.5 times of its natural level, and the increase level also exhibit a small variability among different sample origins. The constant increasing level provide a significantly evidence for the potential use of the natural signal intensities of quartz E1’ centre in tracing sediment provenance. The results show that the signal intensity of E1’ centre increased within beginning 84 h and decreased after 202 h as previous researches have partly predicted. After long time exposed to sunlight, there is no correlation between irradiated samples’ dose rate and its E1’ centre ESR signal intensity. Thus, no new convenient indication shed light on the possible use of the E1’ centre for ESR sediment dating.

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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.