钙华测年中不同方法的对比研究  

]A Comparison of Different Dating Methods for Tufa

作　　者：王华[1] 李强[1] 杨琰[1] 覃嘉铭[1] 冯玉梅[1] 涂林玲[1] 应启和[1] 

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541004

出　　处：《岩矿测试》2006年第4期306-310,共5页Rock and Mineral Analysis

基　　金：四川省地矿局区调队科技资助项目(川发改[2004]161号)

摘　　要：通过14C法、α-铀系法和等离子体质谱(ICPMS)-铀系法对四川黄龙张家沟钙华进行定年对比,以期达到寻找到钙华测年最佳方法的目的。结果表明:ICPMS测年法由于样品需要量极低,比较容易获取高纯度的碳酸盐样品,不但使年龄数据更接近钙华沉积的真实年代,而且还具有样品可反复测量、易于操作等优点,从而使该法成为钙华测年的最佳方法。In order to select the suitable methods to record the environmental change by using tufa, a comparison of different dating methods for tufa was made. From the results, it can be seen that ^14C dating method is not suitable for tufa because the dating results are often disturbed if the sample is contaminated and α energy dating method also has above shortcoming. However, ICPMS dating method not only has the character of litde sample consumption （less than 15 mg）, which makes the use of scarce and high-purity sample possible and therefore makes the results even close to the actual ages, but also has the character of low cost and easy to operate. So ICPMS method is more suitable for tufa dating comparing with other dating methods.

关 键 词：钙华 ^14C测年 α铀系测年 等离子体质谱-铀系测年 

分 类 号：P533[天文地球—古生物学与地层学] P588.245[天文地球—地质学]