摘要
对采自重庆金佛山梁天湾洞穴的一根长290mm的14号石笋进行了高精度的定年和稳定同位素分析.在此基础上,对石笋的沉积结构、层面构造、沉积间断等特征标志进行了研究,阐述了重庆梁天湾洞石笋的沉积特征以及洞穴古滴水的动态变化.TIMSU系测年结果表明:该石笋形成于31.9KaB.P.,结束于15.21KaB.P.,属于末次冰期晚期的产物.石笋的沉积基本连续,没有明显的沉积间断,共分为4个旋回,沉积速率从老到新分别为65.22mm/Ka,8.37mm/Ka,97.09mm/Ka,24.39mm/Ka.
A 290 mm length stalagmite, the LT14 stalagmite, was collected from the Liangtianwan Cave, located in Kingfo Mrs, south of Chongqing. Through the high resolution of TIMS-U series dating and stable isotope analyses, the authors study the depositional structure, band construct and deposition-interruption of the stalagmite and then expound the depositional characteristics and discuss the variation of the paleo-dripping water of the LT14. The TIMS-U series dating data shows that the LT14 stalagmite formed at 31.9 Ka 13. P. to 15.21 Ka 13. P. , in the late period of the Last Glaciation. The LT14 stalagmite deposited continuously and there is no visible deposit-interruption. The deposition of the LT14 can be divided into four cycles and the depositional rate from the oldest to the youngest cycle is 65.22 mm/Ka, 8.37 mm/Ka, 97.09 mm/Ka and 24.39 mm/Ka respectively.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第5期939-943,共5页
Journal of Southwest China Normal University(Natural Science Edition)
基金
重庆市科委院士专项基金资助项目"重庆地区全新世气候变化的高分辨率石笋记录研究"(7853).
