铀系测年和石笋同位素曲线调谐年代表明,位于南京直立人头骨化石层位之上的一支石笋发育年代为381～166kaB.P.,这一结果反映南京直立人生存时代早于381kaB.P从石笋方解石晶体液相包裹体δD测试结果定量计算了该时段内各冷、暖期的古气温。石笋显微剖面中方解石结晶习性和生长条带的特征揭示了洞穴干湿度的变化。
230Th/234U ages are determined on one stalagmite from Tangshan Cave in which fossil hominid craniums were discovered previously. The growth interval of the stalagmite suggests that the Nanjing Man fossils were older than 381 ka B.P.. An oxygen isotope temperature record from 381 to 166 ka B.P. has been obtained by combining data on the isotopic composition of calcites with that of fluid inclusions trapped in the stalagmite. The result of the isotope temperature indicates that temperature of the glacial stages were on average about 10℃ lower than those of the interglacial stages. The variations of crystal habits of calcites and laminated bandding on the stalagmite slice could represent dry and humid changes of cave environment. A comparison between the δ18 O curve and a petrographical microsequence of the stalagmite reveals that the several laminae were geochronologically related to the paleoclimatic events. Our study on trace elements of the stalagmite could not support the opinion that Mg/Sr ratio can be used as a proxy indicator for paleoclimate.
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