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对采集于川东北诺水河溶洞群狮子洞的石笋SI3进行了TIMS U-Th定年和高精度氧稳定同位素(δ18O)分析,对其气候环境意义及与东亚夏季风演化之间的关系进行了研究。在54～46ka之间,SI3的δ18O记录相对变化趋势与同样位于东亚季风区的葫芦洞和董哥洞石笋δ18O记录、与极地冰芯GISP2和中东以色列Soreq洞次生碳酸盐沉积的δ18O记录具有很好的可比性,显示了其与东亚夏季风气候演化和全球气候变化的密切关系。但与其他石笋数据的对比显示SI3的δ18O记录明显偏重,可能与SI3生长地点接近洞口的环境有关,SI3发生了18O富集。对SI3的δ18O记录与气候环境密切相关的机制进行了探讨。
The TIMS U-Th dating and high-precision oxygen stable isotope (δ18O) analyzes of the stalagmite SI3 collected from the Lion Cave cave in Nuosu River in northeastern Sichuan were carried out. The relationship between climate and environmental significance and the evolution of East Asian summer monsoon was also studied the study. Between 54 and 46 ka, the relative trend of δ18O records of SI3 and the δ18O records of the calabash and Dongdong Cave stalagmites also located in the monsoon region of East Asia, and the δ18O records of the polar carbonate GISP2 and the Soreq Cave of Middle East Israel Has a good comparability, showing its close relationship with the evolution of the East Asian summer monsoon climate and global climate change. However, comparison with other stalagmite data shows that the δ18O record of SI3 is obviously biased, which may be related to the environment close to the hole in the SI3 growth site and that SI3 has been enriched by 18O. The mechanism of δ18O record of SI3 closely related to climatic environment was discussed.