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咖啡沙龙第一百四十六期——运用多种测年技术为重要古生物及古人类遗址建立可靠的年代学基础 — 精确与准确之间的权衡

发表日期:2016-10-25来源:放大 缩小

嘉宾(Guest): Dr. Kira WestawayGeochronologist from Macquarie University, Sydney Australia 

讨论主题(Topic): Establishing robust chronologies for important but complex palaeontological and paleoanthropological sites using multiple dating techniques - a trade off between precision and accuracy 

时间(Time): 2016.11.2下午3:00-4:002016.11.2 3:00-4:00 PM 

地点(Location): 北楼602 Room No.602, North Building 

  
 

    Establishing chronologies for evidence found in complex caves sites in the Southeast Asian region can be challenging. The application of only one dating technique with its associated limitations reduces the precision and accuracy of the final age. But apply multiple techniques can also be difficult. Techniques such as U-series dating are good at establishing the minimum and maximum age ranges of fossil evidence found in cave sediments or breccia to a high degree of precision, but direct association between the dating material and evidence to be dated can often be an issue. Luminescence dating can be applied to the burial sediments so offers better association with the fossil evidence but often has lower precision, while ESR can be used to date the fossil itself but often suffers from problems of leaching. What is required is the use of multiple dating techniques that are used in conjunction to reduce the effects of each limiting factor associated with each technique to enable a robust chronological framework to be established for the site. Examples of this approach will be discussed from Liang Bua cave in western Flores, Tamp Pa Ling cave in northern Laos and Lida Ajer cave in northern Sumatra.     

                                         

                                            脊椎动物演化与人类起源重点实验室&研究生会   

                                            Key Laboratory of Vertebrate Evolution and Human Origins 

                                          of Chinese Academy of Sciences & Student Union 

                                                        2016.10.25 

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