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安徽蓬莱仙洞不同滴水点差异PCP作用及其古气候记录研究意义 被引量:7

Prior Calcite Precipitation at Different Drip-water Sites in Penglaixian Cave,Anhui Province and the Paleoclimatic Implications
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摘要 石笋由于分布广泛、定年准确,并且具有丰富的气候和环境代用指标(如氧碳稳定同位素[1,2]、微层厚度[3]、微量元素[4-6]等),因而受到古气候学家广泛关注.其中,微量元素和稳定碳同位素常被用来间接地反映局地干湿变化.当降水减少时,洞穴滴水在洞顶储存时间较长,使岩溶水在补给石笋之前已经发生了方解石沉积作用.由于Mg,Sr和Ba在方解石和溶液中的分配系数远小于1[7,8],从而使Ca优先于Mg,Sr和Ba沉积出来,使得溶液(渗流水及其所形成的滴水)和现代次生碳酸盐沉积物中的Mg,Sr和Ba富集,进而导致Mg/Ca,Sr/Ca和Ba/Ca比值增大[4,5,9],这种现象被称为方解石前期沉积作用(Prior Calcite Precipitation,简称PCP).
出处 《第四纪研究》 CAS CSCD 北大核心 2014年第4期905-906,共2页 Quaternary Sciences
基金 国家自然科学基金项目(批准号:41030103)资助
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