内蒙古湖相沉积^(14)C年代测定中“硬水”影响的发现  

A Finding of the Influence of "Hard Water" on Radio Carbon Dating for Lake Sediments in Inner Mongolia, China

作　　者：任国玉[1] 

机构地区：[1]国家气候中心,北京100081

出　　处：《湖泊科学》1998年第3期80-82,共3页Journal of Lake Sciences

基　　金：国家攀登计划资助!27-1

摘　　要：对内蒙古科尔沁沙地巴克窑泡子湖相沉积物分别做了210Pb和14C测年。比较这两种方法测定结果发现，14C年龄比210Pb估计年龄偏老约2000年，内蒙古其它湖泊的沉积物14C测年资料一般也都存在年龄偏老问题。作者认为，这一现象主要是由干燥和半干燥地区湖泊“硬水”影响引起的。Bakeyao Lake is located in the Horqin Sand Land, in the eastern part of Inner Mongolia. In estimating the dates of the lake sediment, the author found that the radiocarbon dates were nearly 2000 years older than thoes derived from 210 Pb measurements. In order to find out the reason,the author made sonce investigations on some other carbon dating results for lake sediments in the arid and semi-arid areas of China, and found that most of them seemed to be 1000- 2000 years older than expected. This makes the author conclude that the usually older dates derived from the radio carbon dating may have been induced by the 'hard water' effect. Caution therefore should be paid to the carbon dating problem in the future studies in North and West China.

关 键 词：古湖泊 沉积 碳14 同位素年代 硬水影响 

分 类 号：P512.3[天文地球—地质学] P597.3