Variation of luminescence sensitivity of quartz grains from loess in eastern Tibetan Plateau and its provenance significance
Variation of luminescence sensitivity of quartz grains from loess in eastern Tibetan Plateau and its provenance significance
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青藏高原东部黄土石英颗粒发光敏感性变化及其物源意义
DOI：
10.3389/feart.2022.939638
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发表时间：
2022-09
影响因子：
2.9
通讯作者：
Jiantao Zhou
中科院分区：
文献类型：
--
作者：
Li Liu;Shengli Yang;Xiaojing Liu;Pushuang Li;Haiyan Wang;Jiantao Zhou
青藏高原东部广泛分布的黄土沉积是重建青藏高原古环境变迁和沙尘输送历史的重要档案。由于缺乏对ETP黄土来源的充分调查，限制了我们对粉尘输送和古环境意义的理解。石英发光灵敏度在追踪风尘源方面具有很大的潜力。大量的石英发光敏感性研究为黄土粉尘的来源和运移提供了新的认识。然而，ETP黄土物源的发光敏感性及其意义的研究很少。本文选取黄土中的石英颗粒，通过测试其110°C热释光（TL）峰和光释光（OSL）灵敏度，研究了黄土中石英颗粒发光灵敏度的变化，并根据石英发光灵敏度讨论了黄土的物源意义。结果表明，不同位置黄土的石英发光灵敏度在ETP中存在显著差异。马厂、小金和汶川剖面的发光灵敏度值远高于新市和舟曲剖面。110°C热释光峰和光释光灵敏度在古土壤层和黄土层中表现出明显的差异。ETP黄土的石英发光灵敏度主要受尘源的影响。研究结果表明，石英颗粒的发光灵敏度在识别黄土源区方面具有很大的潜力。
The loess deposits widely distributed in the eastern Tibetan Plateau (ETP) are important archives for reconstructing the paleoenvironmental changes and dust transportation history of the Tibetan Plateau. A lack of sufficient investigations on the source of the ETP loess has limited our understanding of dust transportation and paleoenvironmental implications. Quartz luminescence sensitivity holds great potential for tracing eolian dust sources. Numerous quartz luminescence sensitivity investigations have provided new insights into the dust sources and transportation of the Chinese loess. However, studies on luminescence sensitivity and its significance for the ETP loess provenance are scarce. In this work, we selected quartz grains in loess from different sites of the ETP to investigate the variation of luminescence sensitivity by testing the 110°C thermoluminescence (TL) peak and optically stimulated luminescence (OSL) sensitivities of quartz grains and discussed the provenance implications for the ETP loess based on quartz luminescence sensitivities. Our results show the quartz luminescence sensitivities of loess at different locations were significantly different in the ETP. The luminescence sensitivity values of the Machang (MC), Xiaojin (XJ), and Wenchuan (WCH) sections were much higher than those of the Xinshi (XS) and Zhouqu (ZQ) sections. The sensitivity values of the 110°C TL peaks and OSL in the paleosol and loess layers show distinct differences. The quartz luminescence sensitivities of the ETP loess are mainly influenced by the dust sources. Our results show that the luminescence sensitivities of quartz grains have great potential for identifying the loess sources in the ETP.
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影响因子：
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作者：
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影响因子：
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