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本文报道了用高精度热电离质谱（ＴＩＭＳ）法测定的贵州郑家洞ＡＺＪ－２号石笋的铀系年代。该石笋经历了三个速度不同的生长阶段，顶部９０ｃｍ及底部２１ｃｍ生长迅速，ＴＩＭＳ铀系法高分辨率年代结果仍不足以给出其确切的生长速率。精确建立碳氧同位素演化时间坐标的困难，应是从新生碳酸盐提取古气候演变信息的重要制约因素之一。ＡＺＪ－２的生长起止年代为距今１４．７～１３．８万年，贵州在此期间可能处于温暖湿润的气候条件，似支持Ｗｉｎｏｇｒａｄ等认为氧同位素第５期始于距今１４．５万年的观点。本文数据也可解释为在距今１４．７和１３．８万年前，有二个暖湿气候事件
This paper reports the dating of the uranium ages of the stalagmite AZJ-2 at Chengjiazong, Guizhou, using high-precision thermal ionization mass spectrometry (TIMS). The stalagmite experienced three different growth stages, the top of 90cm and the bottom of 21cm rapid growth, TIMS uranium method high-resolution results are still not enough to give the exact growth rate. The difficulty of accurately establishing the time coordinate of evolution of carbon and oxygen isotopes should be one of the most important constraints on the extraction of paleoclimate information from newborn carbonates. AZJ-2 growth starting and ending dates from 14.7 ~ 138,000 years ago, Guizhou during this period may be in a warm and humid climate conditions, it seems to support Winograd so that the first five oxygen isotope dating from 145,000 Years of view. The data in this paper can also be interpreted as 14.7 and 138,000 years ago, two warm and humid climate events