STUDY ON SEDIMENTATION RATE OF MODERN CAVE STALAGMITE CARBONATE (CaCO3) DEPOSITS AND ITS ENVIRONMENTAL SIGNIFICANCE: A CASE FROM PANLONG CAVE, GUILIN, CHINA
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摘要: 洞穴沉积物过去环境记录在短尺度、高分辨率全球变化研究中已成为不可或缺的研究内容。而洞穴滴水作为洞穴石笋形成的介质或媒体,对气候环境变化响应迅速,其物质成分、滴速以及水量的变化直接影响石笋的生长及其蕴含的环境信息,是研究地表环境变化与洞穴石笋沉积的桥梁。洞穴滴水从而成为石笋形成机理和古气候重建研究的热点。通过对桂林盘龙洞的现代碳酸盐(CaCO3)——石笋沉积速率的动态监测,揭示在夏半年(4-10月)是新碳酸盐的主要沉积时段,在10 cm×12 cm的玻璃板上,单点滴水的月平均沉积量为0.7~1.5 g,雨季单点滴水的月沉积量最大达到3.086 g,日平均沉积量最大达到0.103 g,旱季(或冬季)月平均沉积量最小,仅为0.303 8 g (为雨季沉积量的1/10),有2个点在旱季(或冬季)有时甚至没有沉积,表现出与雨热同季的季节变化特点,而且,也具有年际变化的特点。其沉积速率与夏季风降水、生物的活动总量、洞穴空气CO2浓度的变化等密切相关。因此,在现代环境下,监测洞穴次生化学沉积物的沉积过程及其对环境的响应,是洞穴化学沉积物应用于全球变化研究领域的坚实的理论基础。
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关键词:
- 洞穴滴水 /
- 碳酸盐(CaCO3)沉积 /
- 环境意义 /
- 桂林
Abstract: The past environmental information recorded in speleothems has become the focus of short-term and high resolution study of the global changes. Dripping water in cave, as the medium of stalagmite formation, is a proxy responding to rapid change of climatic environment. The changes in composition, drop rate, and amount of the dripping water directly influence the growth rate of stalagmites and to certain extent the environmental information included in it. It is the bridge between the environmental change in the earth's surface and the growth of stalagmites in cave. In this regard, the study of dripping water in cave has become a popular subject for the study of forming mechanism of stalagmites and paleo-climatic reconstruction. Our monitoring of the growth rate of modern carbonate(CaCO3)-stalagmite during two hydrologic years in the Panlong cave of Guilin has revealed that the main period for modern carbonate(CaCO3) precipitation is in the summer season from April to October, the monthly average deposits at a single dripping site changes from 0.7 g to 1.5 g, but the highest value could reach 3.086 g at a single dripping site and the daily mean depositional amount is as high as 0.103 g (or 103 mg) in rainy season. The smallest monthly mean depositional amount at a single dripping site occurs in dry season or winter season. It is about 0.3038g, or about 1/10 of the figure in rainy season. There is even no deposition in dry season or winter season in two dripping sites. Data show that the growth rate of carbonate(CaCO3) has seasonal and Inter-annual changes. The growth rate of modern carbonate(CaCO3) is closely related with monsoon precipitation in summer season, total biologic activities, change in CO2 concentrations in air in the cave. Therefore, to monitor the chemical process of modern carbonate(CaCO3) in cave and its response to environmental changes are critical for the study of global changes. -
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