应用六氯化苯测年法对厦门港现代沉积速率的测定

岩芯柱样用静力岩芯采样器于1986年采自福建省厦门港一九龙江口海域。通过对这些岩芯柱样中六氯化苯(BHC)的垂直分布状况和生物扰动类型的分析,应用 S_R=D_(BHC-D_(mix)/Y的计算模式,获得了这些岩芯的现代沉积速率数据。将这些数据、方法与原理完全不同的~(210)Pb放射性同位素测年法同岩芯测年数据比较,其结果在数据和数量级上有一定可比性。初步认为,再经进一步探索和改进,BHC测年法有可能应用于近岸河口港湾几十年来现代沉积速率的测定而与其它测年法互为补充。

ESTIMATION OF THE RECENT SEDIMENTATION RATE OF XIAMEN HARBOR BY BHC DATING

BHC is an environmental pollutant produced during agricultural production, sanitation and epidemic prevention. BHC features relatively stable molecular structure, high ability against degradation and destruction. Therefore, it can be used as a useful chemical tracer to measure the recent sedimentation rate in ocean and lake. This paper described the first study of recent sedimen dating carried out with BHC Dating in coast from Xiamen Harbor to estuary of Jiulong River in Fujian Province in 1986 by analysis of ten sets of undisturbed sediment cores of relevant sea areas and comparison of data obtained for same cores with 210Pb radioisoto-pic dating, which is completely different in principle and procedures. The results show that these two dating methods are comparable to certain extent. It is tentatively concluded that BHC Daing, after improved with further study, could be applicable for determination of recent sedimentation rate in recent several decades for coastal estuaries and harbors. Dating results for this type of sea areas with this method are also discussed in this paper.