闽西石灰岩洞穴地质特征及其石笋发育过程的古气候变化

Geological feature of limestone caves in western Fujian and its paleoclimatic changes during stalagmite development

本文以宁化县天鹅洞和永定县仙湖洞为代表介绍闽西石灰岩洞穴地质特征，并通过石笋的14C、铀系年代测量等研究成果探讨石笋发育过程的古气候和石笋生长速率。结果表明，闽西石灰岩洞穴发育在70Ma，B．P．，鼎盛时期在12～1MaB．P．间，石笋发育从210ka，B．P．至11ka，B．P．经历5个不同气候期。石笋发育速度不仅受气候期影响，同一时期地方性气候不同的石笋生长速率亦有明显差异。

In this paper we give a brief review on the geological features of the limestone caves distributing in western Fujian,taking the Tian' e Cave in Ninhua County and Xianhu Cave in Yongding County as the examples. Also,the paleoclimate and the stalagmite growth-rate are discussed using the results of 14C and U-series dating. Results show that the caves developed at 70 Ma,B. P. and flourished at 12-1Ma, B. P. - During five different climate periods the stalagmite developed from 210 ka,B. P. to 11 ka,B. P.. Not only the growth rate of the stalagmite was influenced by the climate periods,but also at the same time the growth rate of the stalagmite shows clearily the differences during different local climate.