洞穴碳酸钙沉积的古气候记录研究

洞穴碳酸钙是陆地环境中一种极好的古气候信息库。本文比较论述了中外科学家在该领域的研究历史与最新进展，指出该项研究需要通过高精度地质年代学、同位素地球化学和洞穴沉积学密切配合；并结合作者自己的工作，提出洞穴碳酸钙的稳定同位素和年轮记录是我国东部季风区古季风强弱、干湿变化、干旱事件及强降水事件的极好的高分辨档案

STUDY ON THE PALEOCLIMATIC RECORDS FROM SPELEOTHEMS

Speleothems are important repositories of palaeoclimatic data. Both 14 C and uranium series methods can be used to date the deposit and their precision have been improved with AMS supplied for 14 C and TIMS supplied for U series methods. The stable isotopic sequences of speleothems can give much imformation about palaeoenvironmemt the excellent one of which was from the vein calcite of Devils Hole. The relation between the mean δ 18 O of precipitation and near land surface temperature is complex. The stable isotopic sequences of speleothems from East China could show mainly the condition of wet and dry according to the characteristics of the isotopic change of the precipitation in the monsoon regions of China and the fractional principle of carbonate deposits in caves. The high resolution stable isotopic records from speleothems in East China can supply change of 10 0～10 1a scale of the monsoon, and annual rings of speleothems can supply annual records of precipitation.