杭州地区石笋稳定同位素古气候探索

Study by Stable Isotope method on for Stalagmite from Hangzhou area

用１４Ｃ测年技术和稳定同位素地球化学古温度方法，对浙江省临安瑞晶洞穴的石笋进行了１４Ｃ的测年和碳、氢、氧同位素测试，获得５～１万年间杭州地区古气候演化记录、该记录表明，在５～１万年间有三次较明显的周期性古温度变化，最高温度为１４．９℃，最低温度为６．６℃，最大温差为８℃左右，平均温差３～５℃。这段时期正处在大理冰期后期，但大理冰期并不是一个持续的低温阶段，它至少有３次温度波动。与我们获得的石笋同位素古温度相一致。另外，我们将５～１万年间杭州地区古气候变化与同期东南沿海的海平面变化进行了对比，在时间上也较为吻合，也就是温度上升、海平面也上升，温度下降。

C 14 dating and isotope determination of C.H nad O have been adopted for the staglamite in ruijing cave,LinAn,zhejiang by means of C 14 dating and stable isotope geochemistiy.The records of paleoclimate evolution from 5 to 1×10 4 a B.P. obtained from Hangzhou area show that there were obviously three periodic paleoclimate changes during the preiodwith the highest tempdrature 14.9℃,the lowest 6.6℃ and the biggest temperatwre difference about 8℃ and the mean 3～5℃.The period was just in the late stage of Daliice age,but the age was not a continuous low temperature stage and it had, at least,three temperature fluctuation,which is in line with isotopic paleotemperatnre of the staglamite measured by us.In addition,We have correlated the paleoclimate changesfrom 5 to 1×10 4 a B.P. of Hangzhou area with the synchronological sealevel changes of the coastal area in Southwest China. The result shows that thay are basically cojcident, i.e.,when the temperature rises.the sealevel rises,too,and the femperature falls,and the sealevel falls as well.