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首页> 外文期刊>Nature >Optical and radiocarbon dating at Jinmium rock shelter in northern Australia
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Optical and radiocarbon dating at Jinmium rock shelter in northern Australia

机译：澳大利亚北部Jinmium岩石避难所的光学和放射性碳测年

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The Jinmium rock shelter is located in the Kimberley region of northern Australia. Claims for ancient rock art and an early human presence at this site were based on thermoluminescence ages of 50-75 thousand years (kyr) for quartz sands associated with buried circular engravings (pecked cupules) and on thermoluminescence ages of 116-176 kyr for the underlying artefact-bearing deposits. Here we report substantially younger optical ages for quartz sand, and ages based on measurements of radioactive carbon in charcoal fragments, from the occupation deposit. Using conventional (multiple-grain) optical dating methods, we estimate that the base of the deposit is 22 kyr. However, dating of individual grains shows that some have been buried more recently. The single-grain optical ages indicate that the Jinmium deposit is younger than 10 kyr. This result is in agreement with the late-Holocene ages obtained for the upper two-thirds of the deposit from radiocarbon measurements. We suggest that some grains have older optical ages because they received insufficient exposure to sunlight before burial. The presence of such grams in a sample will cause age overestimates using multiple-grain methods, whether using thermoluminescence or optical dating.
机译：Jinmium岩石掩体位于澳大利亚北部的金伯利地区。对古代岩石艺术的宣称以及人类在此地的早期存在是基于与埋入式圆形雕刻（啄形吸盘）相关的石英砂的热致发光年龄为50-7.5万年（基尔），而对于石英砂的热致发光年龄为116-176吉尔。潜在的人工制品沉积物。在这里，我们报告了石英砂的光学年龄显着年轻，并且根据对来自占领矿床的木炭碎片中放射性碳含量的测量得出了年龄。使用常规的（多颗粒）光学测年方法，我们估计该矿床的基数为22年。但是，对单个谷物的测年表明，有些谷物是最近被埋藏的。单晶光学年龄表明，金矿床年龄小于10年。这一结果与从放射性碳测量获得的上部三分之二沉积所获得的晚全新世年龄一致。我们建议某些谷物具有较宽的光学年龄，因为它们在埋葬之前没有充分暴露在阳光下。样品中这种克的存在，无论是使用热致发光还是光学测年法，都会通过多粒度方法导致年龄被高估。

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