| 桂林44kaB.P.石笋同位素记录及其环境解译 |
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| 关键词:Guilin stalagmite isotope paleoenvironme |
| 基金项目:国家自然科学基金(批准号:49632100)资助重点项目; 国土资源部重点科技项目(批准号:9501104) |
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| Isotopic Records of Stalagmites from Guilin since 44 ka B.P. and Their Environmental Interpretation |
| This paper has studied the correlation between the precipitation and other climatic factors, as well as the oxygen and carbon isotopes in the calcite of the stalagmites deposited in last glaciation and Holocene.The results show that the δ values of the oxygen and carbon isotopes in stalagmite calcite have a negative correlation with the annual mean surface temperature. The parallel high resolution studies of two stalagmites since 44 ka B.P. gave the same results. It is shown the that there are 3 climatic stages, i.e. 10.7ka ～present,25.6～10.7ka B.P. and 44～25.6ka B.P.. Stage 1 is Holocene, which was warm and wet.Stages 2 and 3 mean the last glaciation, which was cold and dry,Stage 2 being the coldest.These three stages can be correlated with the oxygen isotopic records of the deep sea sediments and climatic records of Vostok ice core. The overall trend of climatic changes were from warm to cold, and the temperature varied from low to high in the last glaciation in the study area. Around 11kaB.P., expression of Younger Dryas was obvious in this area. After that period, the air temperature went up rapidly and was close to the pressent level in 10.7kaB.P.. |
| QIN Jia-ming,YUAN Dao-xian,LIN Yu-shi,ZHANG Mei-liang,LI Bin.2000.Isotopic Records of Stalagmites from Guilin since 44 ka B.P. and Their Environmental Interpretation[J].Acta Geoscientica Sinica,21(4):407-416. |
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