马坝人地点南支洞铀系定年初步结果

报道马坝人地点南支洞次生碳酸盐岩和骨化石样的铀系年代. 根据表层钙板 2 个样品 3 次测试的平均结果,其下含化石堆积应早于 237 ka. 出自第二层堆积的骨化石样分析结果显著小于上覆表层钙板,可引为骨化石铀系年代结果可信度欠佳的例证. 基于洞穴地点骨化石样铀系年代总体偏低的认识,并基于南支洞与出土马坝人化石裂隙堆积层位相当的假设,我们认为可暂以南支洞表层钙板年代 (237 ka),代表马坝人化石的最小年代. 南支洞尚存较多的含化石堆积,多学科综合研究或可为马坝人的年代位置提供进一步的证据.

Preliminary U-series dating of Southern Branch Cave of Maba hominid site

This paper reports the U-series dating results of calcites and mammalian fossils from Southern Branch Cave of Maba hominid site. Three times of ^230Th/^234U analysis on two samples from capping flowstone present an average results of 237 ka, indicating the minimum age of fossiliferous deposits here. Age result of the mammalian fossils from the 2th layer is much younger than that of capping flowstone. This can be cited as an example of the limited reliability of U-series analysis on mammalian fossils. Based on the hypothesis that deposits of South Branch Cave are generally contemporaneous with those containing the Maba Man, we recommend the result of 237 ka can be temporarily used to represent the minimum age of it. There are still a lot of fossiliferous deposits in South Branch Cave. Further multidisciplinary studies may provide further evidence for verifying the age of Maba Man.