贵州荔波第四纪晚近期石笋地质年表与气候事件  

THE GEOLOGICAL TIME SCALE AND CLIMATIC EVENTS FROM STALAGMITES IN THE LATE OR RECENT QUATERNARY PERIOD IN THE LIBO AREA, GUIZHOU, SOUTHWEST CHINA

作　　者：林玉石[1] 张美良[1] 程海[2] 袁道先[1] 覃嘉铭[1] 王兆荣[3] 冉景丞 

机构地区：[1]中国地质科学院岩溶地质研究所,岩溶动力学开放研究实验室,广西桂林541004 [2]美国明尼苏达大学地质与地球物理系同位素室,美国mn55455 [3]中国科技大学地球与空间科学系,安徽合肥230023 [4]国家级茂兰喀斯特森林自然保护处,贵州荔波558400

出　　处：《地学前缘》2003年第2期341-350,共10页Earth Science Frontiers

基　　金：IGCP44 8国际对比研究项目 ;国家自然科学基金项目( 4 0 15 2 0 0 2 )

摘　　要：南方岩溶区大型石笋年代地层学研究表明石笋是第四纪 (系 )研究的主要对象之一 ,石笋比其他第四纪沉积物更易高精度定年。贵州荔波地区以 6 8个TIMS U系正序平行测年 ,建立了第四纪晚近期 16 2 .3ka以来的地质年表 ,确定全新世与晚更新世以 9.36 3ka分界 ,而晚更新世与中更新世以12 8.5ka分界 ,提出距今 35 0年、2 30 0年……和新仙女木、类Heinrich等一系列冷事件的跃变年代 ,事件的冷暖转 (突 )变时限具区域对比意义。认定应以大型石笋系统测年建立第四纪地质年表 ,不宜用少数测年值按 2～ 3个沉积速率推算建年表 ,亦不宜以小型石笋“系统”测年建年表 ,以免因间断沉积造成自然的、人为的缺层和漏测 ,使年表失实。The chrono stratigraphy study of the large stalagmites in the karst area in south China shows that stalagmites are one of the main study object in the Quaternary period. The high precision estimation of the age of stalagmite is more possible than that of the other sediments in the Quaternary period. From the normal order of the parallel dating age with 68 TIMS U series samples in the Libo area of South Guizhou the geological time scale has been established since the late or recent Quaternary or since 162.3 ka B P, the boundary age of 128.5ka B P between Holocene and the late Pleistocene has been confirmed; the jump time of a series cold events which ranges from 350 year B P to 2 300 year B P, the younger Dryas and the similar Heinrich, and so on have been put forward; the trans chron of the cold and warm climate is of the region correlation significance . It has been firmly believed that the geological time scale should be established by using the data of the system dating ages of large stalagmites rather than a calculation from two or three sediment rates by using a few dating age value and the 'system' dating ages of the small stalagmites in order to avoid missing some important information such as depositional break, and the natural lack bed.

关 键 词：贵州 第四纪 石笋 沉积物 气候事件 地质年表 沉积速率 

分 类 号：P534.63[天文地球—第四纪地质学] P532[天文地球—古生物学与地层学]