Determination of Trace Dissolved Silicon in a Stalagmite from Qingjiang, Hubei, China, and Its Paleoclimatic Significance
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摘要: 洞穴石笋蕴含着丰富的古气候信息, 其正确解译有赖于各类古气候替代指标的开发.应用改进的硅钼兰分光光度法测定湖北清江榨洞石笋中痕量可溶硅, 探讨其古气候的指示意义.结果表明, 石笋中可溶硅含量记录了岩溶地下水的硅酸组成, 后者反映了气候控制下土壤的化学风化作用.因而, 石笋可溶硅是一个潜在的古气候(特别是古湿度) 替代指标.Abstract: Speleothems contains abundant paleoclimatic information and the correct interpretation depends on the development of various paleoclimatic proxies. In this paper, an improved reduced molybdosilicic acid spectrophotometry is used to measure trace dissolved silicon in a stalagmite from Zha cave, Qingjiang, Hubei Province and reveals its indication of the paleoclimate. It is discovered that a 9 000 a dissolved silicon may have recorded the variability of local groundwater chemistry composition. Under the chemical weathering process, the dissolved silicon originated from the silicate in soil is found to be controlled by the weather condition. Therefore, the dissolved silicon may be a potential proxy for paleoclimate, especially for ancient moisture.
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Key words:
- dissolved silicon /
- stalagmite /
- chemical weathering /
- paleoclimate
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