【摘要】 根据中国大陆东部十八个洞穴区域、五十余个洞穴沉积物的²³⁰Th/²³⁴U年代及部分试样的碳、氧同位素测定,讨论了35万年以来洞穴沉积古环境。年龄测定表明,其沉积期集中在1)2.0万年以来;2)7.5—12.0万年;3)17.0—23.0万年;4)25.0—31.0万年等,他们代表着四个温暖湿润的间冰期,并可与海洋古气候记录的温暖高水位期对比。更多还原

【Abstract】 Based on 53230Th-234U ages for 40 different speleothems in 18 cave system sites from the Eastern Mainland of China and studies of stable isotopes of carbon and oxygen, the paleoenvironment of speleothems since 350,000 years is discussed. Attributing episodes of deposition to interglacials and nondeposition to glacial periods, interglacials are recognized at 1) present to 20 ka; 2) 75-120 ka; 3)170 -230 ka; 4) 250-310 ka. These iaterglacals correlate with periods of high sea level and warm-wet climate observed on the isotopic record of marine foraminifera更多还原