Spurious Thermoluminescence from Stalagmite: A New Paleoenvironmental Proxy
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摘要: 海相碳酸盐热释光灵敏地响应冰期-间冰期地球气候变化，是一个新的古海洋代用指标，但是否适用于陆地沉积物，尚缺少研究.通过测定湖北清江穿心洞石笋(CX-1)碳酸盐热释光和氧同位素组成，探讨石笋热释光的发光机制，开发热释光作为陆地古环境的替代指标，发现空气环境中检测的石笋碳酸盐热释光主要是发光有机质氧化产生的化学发光，为假性热释光.石笋中发光有机质来源于土壤中有机物的降解，其含量与太阳辐射调控的土壤温度有关；热释光曲线与其对应的氧同位素曲线变化趋势相似.因而，石笋碳酸盐假性热释光是反映过去环境变化的一个新指标.Abstract: Thermoluminescence from marine carbonate is found to be sensitively responding to the earth climate change of glacial-interglacial stage, which implies a novel proxy for paleoceanography. Yet it is to be confirmed by studies as to whether it is suitable for the terrestrial sediments. In this study, thermoluminescence and oxygen isotopic composition have been carried out on stalagmite CX-1 from Chuanxin cave, Qingjiang valley, Hubei Province, China, to determine the physical links between the climate and thermoluminescence intensity. It is found that thermoluminescence glow in air environment is mainly contributed by chemiluminescence derived from oxidation of the organic matter from stalagmite carbonates. Therefore, thermoluminescence is closely related to organic matter content of stalagmite derived from the degradation of organic matter in soil and the degradation rate is related to soil temperature controlled by the insolation. The variations of TL (total luminescence intensity) and δ18O show similar features which can reasonably be associated with climate change. Therefore, stalagmite thermoluminescence can act as a new proxy for terrestrial paleoenvironment.
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Key words:
- stalagmite /
- thermoluminescence /
- luminescent organic matter /
- oxygen isotope /
- solar insolation /
- climate change /
- sediments
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图 1 穿心洞所在位置示意(a)、洞穴平面图(b)和CX-1石笋沿生长轴纵切面照片(c) (图 1c中刻度线表示沿石笋生长中心的氧同位素和热释光采样轨迹)
Fig. 1. Location of Chuanxin cave (a), a plan view of its cave system (b) and a photograph of the complete CX-1 stalagmite (c)
图 2 在不同测试环境中石笋碳酸盐热释光发光曲线
Fig. 2. The thermoluminescence glow curves of stalagmite carbonate under various test environments
图 3 CX-1石笋的热释光强度(发光总量、发光强度)与δ18O曲线对比
Fig. 3. Variation of TL intensity(total luminescence intensity, luminescence intensity) and δ18O from stalagmite CX-1
图 4 发光总量与发光强度之间相关性
Fig. 4. Correlation between the total luminescence intensity and luminescence intensity in stalagmite CX-1
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