作　　者： ; ;

机构地区： 北京联合大学

出　　处： 《资源科学》 2005年第3期161-166,共6页

摘　　要： 云南弥勒县白龙洞发育于三叠纪灰质白云岩中,洞中碳酸钙景观的风化现象比较明显。本文从洞穴风的影响和碳酸钙沉淀条件两方面分析风化的原因,结果表明:土-岩系统的特点在其中起着十分重要的作用:　①它可以通过控制洞腔形态影响洞穴风速变化;　②水中CO2排放通量受滴速影响成为新洞积石形成的决定条件之一;　③利用HYDROWIN程序,证明了洞穴滴水的主要矿物成分对景观物质组成的影响。 Bailong Cave with its well-developed Middle Triassic calcareous dolomite's system was opened as a show cave for visitors in 1988. The speleothems scenery has been strongly weathered as white powder on the outer layers. The authors analyze the reasons from the soil-rock system that comprises the rock controlling the cave's configuration and the soil covering on it functions. 1) The cave dimension structure distinctively affects the cave winds especially in some places that dimensions are less than one meter laying on the travel road. It will produce relatively high cave wind speed; 2) Soil was about 0cm～50 cm thick and filled to 50cm～120 cm in the limestone solution fissures. Based on the different soil grain size distribution, clay was the highest in composition in the soil. By calculating the interval that dripping velocity reacts to the rainfall and the CO_2 flux in drops the soil-rock system's permeability is poorer than other show caves and this is not benefit for the new speleothems growth. The fissure with soil filling is the principal water seepage zone. The potential capacity of soil water to dissolve carbonate rocks is controlled by the CO_2 content in the soil and fissures, and the permeability and recharge rate. If the system permeability is very low, the system will contribute little to the speleothems development; 3) A 125 ml plastic bottle equipped with a funnel was used to collect the dripping water. Study of 9 dripping water samples adopted in different cave spots by HYDROWIN computer program the major dissolved minerals compositions are ascertained and the ratio of [Ca^(2+)]/[Mg^(2+)] in samples are less. This may explain why new speleothems are seldom to be seen.

关 键 词： 风化 洞穴景观 云南 系统 沉淀条件 风速变化 排放通量 物质组成 矿物成分 洞穴滴水 碳酸钙 白云岩 三叠纪 弥勒县

领　　域： [天文地球] [农业科学] [农业科学] [农业科学]