摘要
作者使用质谱计以及电子探针仪对石笋同步进行高精度、高密度的碳氧稳定同位素以及元素含量的连续测定,以对桂林地区古气候的长期变化进行研究,结果如下:1.6500aB.P.～3000aB.P.期间,该石笋的δ^(15)O测定结果可作为古气温长期变化的标志。该期间的古气温变化幅度不大,无气候变化异常现象。3000aB.P.以来,该石笋的δ^(18)O测定结果不能作为该期间的古气温长期变化标志。2.3000aB.P.以来,可能存在三次强烈的溶蚀作用。3.上述三次强烈的溶蚀作用似乎反映了以雨水量增大为特点的古气候变化异常。
The authors, using the mass analyzer and electron probe microanalyzer, have made a successive and synchronous study of the δ13C,δ18O and elementary content of the stalagmite with high precision and high density, and obtained the following result of the long-term variation of palaeoclimate in the region of Guilin. 1. For the period from 6500 to 3000aB.P., the δ18O result of the stalagmite might serve as the indicator of the long-term variation of the palaeotemperature in Guilin. The result shows that the palaeotemperature during the period did not vary very much, and that the δ18O result of the stalagmite over the 3000aB.P. could not serve as the indicator of the long-term variation of the palaeotemperature. 2. Over the 3000 aB.P. or so there might have been three violent attacks of corrosion. 3. Over the 3000a B. P. or so there seems to have been three unusual palaeoclimatic changes characterized by the increase of rainfall.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1990年第6期689-696,共8页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金资助项目
关键词
岩溶
古气候
洞穴
沉积
石笋
palaeoclimate, karst, secondary chemical cave deposit, stalagmite,carbon isotopes, oxygen isotopes, Guilin.
