南极半岛西北海域表层沉积物~(14)C年龄测定及其年代误差问题的探讨

本文报道了应用~(14)C年龄测定法对南极半岛西北海域所采集的12个表层沉积物样品~(14)C年龄测定结果,以及在乔治王岛采集的2个现代碳样品~(14)C比度测定结果。这些结果表明,该海区大气CO_2中~(14)C比度与海水中的~(14)C比度存在一定的差异,作者对这种差异所造成的沉积物年龄偏老现象进行了初步的讨论,认为南极半岛西北海域表层沉积物的~(14)C年龄比真实年龄至少要老456年(该值仅反映海洋贮存库效应的表观年龄,没有作由于原子弹爆炸使大气中~(14)C比度增加而造成~(14)C年龄偏低的校正)。

CARBON-14 DATING OF THE SURFACE SEDIMENTS FROM SEA AREA NORTHWEST OF THE ANTARCTIC PENINSULA AND ITS ERRORS

This paper deals with a result of radiocarbon dating of the surface sediments dreged from the sea area northwest of the Antarctic Peninsula and measurement of modern radiocarbon on two specimens (living byophtes and penguin bones ) collected on King George Island. The information of two modern carbon samples indicates that the concentration of car-bon-14 in the sediments from the sea area northwest of the Antarctic Peninsula is different from that in atmospheric CO2.This difference in 14C concentration resulted in increasing age of surface sediments is preliminarily discussed in the paper. The author points out that the 14C age of the surface sediments in the sea area northwest . of the Antarctic Penisula is 456 years older than the actual ages at least (the increasing concentration of 14C was caused by nuelar explosion which is not considered) .