【摘要】 对采自重庆金佛山梁天湾洞穴的一根长达295mm的石笋进行了高精度的T IM S-U系定年和碳氧稳定同位素测试分析,初步建立了末次冰期晚期(31.90~15.21 ka B.P.)以来长江中游地区较高分辨率的古气候变化序列。石笋大约从31.90kaB.P.开始沉积,至15.21kaB.P.沉积结束,属于末次冰期晚期的产物,其平均沉积速率为1.77mm/100a。从石笋的氧同位素曲线中明显地检出了H e inrich事件,并且氧同位素曲线与周边地区的石笋记录有着良好的对比关系。更多还原

【Abstract】 High precision TIMS-U dating and carbon-oxygen stable isotope measurement are conducted to a 295mm stalagmite sampled from Liangtianwan cave,Jinfushan,Chongqing.A relatively high resolution paleo-climatic series in the middle reaches of the Yangtze River since the late period of the Last Glacial Epoch(31.90～15.21 ka B.P.) is constructed roughly by the results.The stalagmite,an outcome of the late period of the Last Glacial Epoch,began to precipitate at about 31.90ka B.P.with an average growth speed of about 1.77mm/100a and stopped at about 15.21 ka B.P.The Heinrich Events obviously were checked out from the oxygen isotopic curve of the stalagmite.And the oxygen isotopic curve of the stalagmite is better related and corresponded with the records of the other stalagmites froms the adjacent area.更多还原