贵州纳朵洞洞穴滴水、现代沉积物δ^(18)O特征及其环境意义  

Characteristics and environmental significance of isotopes record from cave drip water and recent deposit in Naduo cave,Guizhou

作　　者：毛庆亚 王建力[1,2] 王家录[1,3] 李文 MAO Qingya;WANG Jianli;WANG Jialu;LI Wen(School of Geographical Sciences,Southwest University,Chongqing 400715,China;School of Resources and Environmental Engineering,Anshun University,Anshun,Guizhou 561000,China;Key Laboratory of the Three Gorges Reservoir Region＇s Eco-Environment,MOE,Chongqing 400715,China;Anshun Meteorological Bureau,Anshun,Guizhou 561000,China)

机构地区：[1]西南大学地理科学学院,重庆400715 [2]三峡库区生态环境教育部重点实验室,重庆400715 [3]安顺学院资源与环境工程学院,贵州安顺561000 [4]安顺市气象局,贵州安顺561000

出　　处：《中国岩溶》2018年第2期107-113,共7页Carsologica Sinica

基　　金：贵州省科技厅联合基金项目(黔科合J字LKA[2012]18号;黔科合J字LKA[2012]09号;黔科合LH字[2014]7498);贵州省科技计划院士工作站项目(黔科合平台人才[2016]5602);国家重点研发计划(2016YFC0502600)

摘　　要：为了研究洞穴滴水及其对应的现代沉积物氧同位素的变化特征和对外界气候环境的指示意义,文章对贵州纳朵洞洞外大气降水、洞穴池水、6处滴水点及其对应的现代沉积物氧同位素进行了近2年的监测。结果显示纳朵洞外大气降水和洞穴池水δ^(18)O值均呈现旱季偏重,雨季偏轻的季节特征,基本能反映洞穴所在区域的气候变化。而滴水沉积物δ^(18)O值和滴水δ^(18)O值自身存在协调同步的季节特征,但二者δ^(18)O值与大气降水δ^(18)O值却呈现反向的季节变化,这可能是区域地形、岩溶表层带的调节和大气环流共同作用的结果。To explore the cave drip water and the variation characteristics of its corresponding oxygen isotopes in modern deposits and their significance to the climatic environment,the atmospheric precipitation outside the Naduo cave in Guizhou,cave pool water,six drip points and their corresponding modern deposits oxygen stable isotopes have been monitored for the past 2 years.The results show that the δ^18O in atmospheric precipitation,drip water,and deposits of Naduo cave are generally lower than those in most other southern regions.However,the seasonal variation of δ^18O from all three sources is significant.For example,the δ^18O in atmospheric precipitation outside Naduo cave and in cave pool water both have seasonal characteristics that are higher in the dry season and lower in the wet season,and can basically reflect the climate change in the area where the cave is located.Though the δ^18O in deposits and drip water have similar seasonal variation,they show a very different pattern from the δ^18O in the atmospheric precipitation.This may be the result of the combination of regional topography,karst surface zone regulation,and atmospheric circulation.

关 键 词：大气降水 洞穴滴水 现代沉积物 Δ^18O 纳朵洞 

分 类 号：P641.3[天文地球—地质矿产勘探]