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首页> 外文期刊>Radiocarbon >INTERPRETING RADIOCARBON DATES FROM THE PALEOLITHIC LAYERS OF THEOPETRA CAVE IN THESSALY, GREECE
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INTERPRETING RADIOCARBON DATES FROM THE PALEOLITHIC LAYERS OF THEOPETRA CAVE IN THESSALY, GREECE

机译：从希腊浅海层的白垩纪古岩石层解释放射性碳年代

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摘要

Theopetra Cave is a unique prehistoric site for Greece, as the Middle and Upper Paleolithic, Mesolithic, and Neolithic periods are present here, bridging the Pleistocene with the Holocene. During the more than 20 yr of excavation campaigns, charcoal samples from hearths suitable for ~(14)C dating were collected from all anthropogenic layers, including the Paleolithic ones. Most of the samples were initially dated using the ABA chemical pretreatment protocol in the Laboratory of Archaeometry of NCSR Demokritos, Greece, and the Radiocarbon Dating and Cosmogenic Isotopes Laboratory of the Weizmann Institute of Science, Israel. The ~(14)C results, which were not always consistent versus depth, showed that the earliest limit of human presence is ~50,000 yr BP, thus reaching the age limits of the ~(14)C dating method. However, 10 TL-dated burnt flint specimens unearthed from the lower part of the Middle Paleolithic sequence of the cave gave ages ranging between -110 and 135 kyr ago. These results are in disagreement with the ~(14)C dates, as they support a much later date for these layers. In order to clarify the situation further, charcoal samples originating from hearths were conventionally dated in the Laboratory of Archaeometry of NCSR Demokritos using the ABA pretreatment. Additionally, hand-picked charcoal fragments also underwent ~(14)C dating by AMS in the Oxford Radiocarbon Accelerator Unit using the acid-base Wet oxidation (ABOX-SC) pretreatment protocol. The ~(14)C dates from the cave's Paleolithic layers obtained by both pretreatment protocols suggest a probable charcoal diagenesis affecting the ~(14)C results of these very old samples. However, the dates obtained with ABOX-SC pretreatment are considered more reliable and in the younger stratigraphic part produced consistent results with the TL dating.
机译：Theopetra洞穴是希腊独特的史前遗址，这里存在中，旧石器时代，中石器时代和新石器时代，将更新世与全新世联系起来。在20多年的挖掘活动中，从所有人类活动层（包括旧石器时代）收集了适合于〜（14）C年代的炉床的木炭样本。大多数样品最初是使用希腊NCSR Demokritos考古实验室的ABA化学预处理方案以及以色列魏兹曼科学研究所的放射性碳定年和宇宙成因实验室的日期确定的。 〜（14）C结果在深度上并不总是一致的，它表明人类存在的最早极限是〜50,000 yr BP，从而达到了〜（14）C测年方法的年龄极限。然而，从洞穴中古石器时代序列的下部发掘出的10个TL日期的火石标本的年龄介于-110至135年前。这些结果与〜（14）C日期不一致，因为它们支持这些图层的更晚日期。为了进一步澄清这种情况，通常在ABA预处理的NCSR Demokritos考古实验室中对源自炉膛的木炭样品标明日期。此外，还使用酸碱湿式氧化（ABOX-SC）预处理方案在牛津放射性碳加速器装置中通过AMS对手工挑选的木炭碎片进行了〜（14）C测年。 〜（14）C的数据来自两种预处理方案获得的洞穴旧石器时代，表明可能是木炭成岩作用，影响了这些非常老的样品的〜（14）C结果。但是，用ABOX-SC预处理获得的日期被认为是更可靠的，并且在年轻的地层部分与TL年代产生了一致的结果。

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