山东开元洞滴水微量元素季节变化特征及影响因素

Seasonal variations in trace elements and influencing factors in drip water from Kaiyuan Cave,Shandong Province

选取山东淄博开元洞进行了为期15个月的洞穴滴水采集,开元洞位于中国北部山东半岛沿海的暖温带半湿润季风气候区。洞穴滴水地球化学分析结果表明:(1)洞内滴水点的滴水滴速变化对外界大气降水的变化响应迅速。(2)滴水中的Ca2+、Mg2+、Sr2+、Ba2+浓度都具有季节变化特征,但其具体表现和影响机制有所不同。(3)开元洞滴水的Sr/Ca、Ba/Ca比值的波动变化与洞外大气降水变化可能存在响应关系,滴水中的Mg/Ca、Sr/Ca和Mg/Sr比值,可能与强降水存在响应关系;但是开元洞滴水中的Mg/Sr比值的变化与洞外气温并没有体现出响应关系。

Drip water samples for 15 months were collected from the Kaiyuan Cave,Zibo City of Shandong Province,a cave located in a semi-humid monsoon climatic zone in coastal North China.Geochemical information suggests that:(1)the variations in dripping rates respond rapidly to the atmospheric precipitation outside the cave.(2)Although the Ca2+,Mg2+,Sr2+and Ba2+concentrations display significant seasonal variations,their behaviors and influencing mechanisms are rather different.(3)The Sr/Ca and Ba/Ca ratios of the drip water may respond to certain degree to the atmospheric precipitation outside of the cave,and,especially,the Mg/Ca,Sr/Ca and Mg/Sr ratios may well indicate heavy rainfall.However,the variations in Mg/Sr in the drip water do not respond obviously to surface air temperature.