陆地和海洋环境演变研究中的释光测年进展

晚全新世以来所发生的特征环境事件的年龄测定,由于研究地区复杂及独特的地质条件,能够充分适用的测年方法有限,而释光测年方法(包括热释光和光释光方法)独有的揭示砂粒级无机成分末次曝光年龄的特点,正好适合于复杂的海岸带沉积环境,并且没有或者较少受到宇宙成因核素年代学分析方法中核素污染等干扰因素的影响。评述了释光测年方法的进展情况,并通过国内外在陆地、海洋和海陆带环境演变响应研究中几个成功运用释光测年方法的案例,分析了这种放射性测年方法的特点,并指出今后释光年代学方法研究的方向。

LUMINESCENCE DATING FOR ENVIRONMENTAL EVOLUTION STUDY IN TERRESTRIAL LAND,DEEP SEA AND COASTAL BELTS:A REVIEW

Due to the complicated geological situation in coastal belts,very limited methods have ever been used for environmental study dealing with these zones,in particular the evidence of age concerning the typical environmental events within the Holocene period.Young ages mean their correlation with human activities,and the limitations of radionuclide dating methods,e.g.,()(~(10)Be),radiocarbon and uranium/thorium,are normally used for coastal study.In contrast,luminescence dating method(both thermoluminescence and optical stimulated luminescence)can be successfully used for coastal belt study due to its exclusive feature of exploring age information of inorganic sand-size samples,whilst it is free of contamination resulting from radionuclide completely or partially.This paper discusses several cases and analyse the features of application of luminescence dating methods to studying environmental evolution in terrestrial land,deep sea and coastal belts as well as the future research work in this regard.