| 贵州凉风洞洞穴滴水水文水化学过程分析 |
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| 引用本文： | 周运超,王世杰.贵州凉风洞洞穴滴水水文水化学过程分析[J].第四纪研究,2005,25(2):208-215. |
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| 作者姓名： | 周运超 王世杰 |
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| 作者单位： | 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳,550002;中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳,550002 |
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| 基金项目： | 中国科学院知识创新工程项目;国家自然科学基金 |
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| 摘 要： | 通过对贵州荔波凉风洞5个滴水点进行为期1年的动态监测,表明除大气降雨携带的较少物质成份外,凉风洞滴水中的物质主要来源于土壤,同时,示踪结果显示出凉风洞滴水对大气降雨的响应较快,滴水的物质组成直接源自于洞穴环境。洞穴滴水的化学组成中元素含量的变化主要由水运移过程中水-土、水-岩作用导致的方解石溶解-沉淀过程所控制,稀释作用、水来源的差异或者活塞流产生了一定的效果,但其影响较弱,表明凉风洞滴水点的次生沉积物可能记录了环境变化信息。但水在洞穴顶板内运移过程中发生的水文地球化学过程(岩石的溶解、方解石沉淀作用过程)以及洞穴滴水响应大气降雨的时间尺度、水动力过程、水流形式等因素,影响到凉风洞洞穴次生沉积物过去环境记录指标。因此,岩溶次生沉积物过去环境变化指标的解译应该有洞穴滴水水动力地球化学过程的结果作为支撑。这些过程的清晰化可以更好地为研究洞穴环境次生沉积记录的高分辨率、短时间尺度的过去变化提供依据。
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| 关 键 词： | 贵州凉风洞 洞穴滴水 水动力过程 作用特点 |
| 文章编号： | 1001-7410(2005)02-208-08 |
| 收稿时间： | 2004-12-01 |
| 修稿时间： | 2004年12月1日 |
ANALYSIS OF HYDROCHEMICAL PROCESS OF DRIP WATER IN THE LIANGFENG CAVE, LIBO, GUIZHOU |
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| Zhou Yunchao,Wang Shijie.ANALYSIS OF HYDROCHEMICAL PROCESS OF DRIP WATER IN THE LIANGFENG CAVE, LIBO, GUIZHOU[J].Quaternary Sciences,2005,25(2):208-215. |
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| Authors: | Zhou Yunchao Wang Shijie |
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| Institution: | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 |
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| Abstract: | This paper deals with 5 drip points monitored yearly in the Liangfeng cave, Libo county of Guizhou Province, China. The existence of karst forest and soil covered over the cave has allowed much better permeability and rainfall uniformly dispersed. The result shows that preferential flow is the main type of water transport in the cave roof, and the drip water responding to rainfall is much faster, but with differences among the drip points. Active processes of water-soil and water-rock control the diversity so that it results in different chemical compositions of drip water. Simultaneously, according to the research of element geochemistry, water transporting in the cave roof influenced the sources of the substances, and the substances in drip water mainly come from the soil in the roof of the Liangfeng cave except that a fewer content of elements origins from the rainfall. With the temperature rising, accelerating of the activities of organism and the content of soil CO 2 led to a higher CO 2 partial pressure in the soil water and water penetrating rock fissures, dissolving rock till saturated quickly and leading to the precipitation of calcite. The change of element contents of cave drip composition was controlled by all of these processes. Dilution and different sources of water coming from and (or) piston flow had some effects on the drip water composition; however, the effect is much fewer. The result implies that the speleothems of 5 drip points in the Liangfeng cave probably had preserved the information of environmental change. For the reason that different drip point in the cave was also affected by other kinds of actions, the information preserved in speleothems might be different although they were minor influenced by these factors. At different time scales, action ways and substance sources of water-soil and water-rock interactions of different drip points affected the evaluation standard and substance source of karst speleothem in addition to the existence of large variance of water dynamic condition among the drips. It implied that hydrogeochemical process of water transport in the roof of cave (rock dissolved and calcite precipitation), time scale of drip water responded to rainfall, hydrodynamic process and ways of water transport in the cave roof etc. influenced the index of past environmental change recorded in karst speleothem. From this point of view, accurate interpretation of the index of past karst environmental change must be supported by clearly understanding hydrogeochemical dynamic process of drip water. The clarification of the process of drip water will contribute to the further studying karst environmental change of high resolution and short time scale of speleothem record. |
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| Keywords: | Liangfeng cave of Guizhou Province cave drip water hydrodynamic process action characters |
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