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首页> 外文期刊>Quaternary geochronology >Marine reservoir corrections for the Caribbean demonstrate high intra- and inter-island variability in local reservoir offsets
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Marine reservoir corrections for the Caribbean demonstrate high intra- and inter-island variability in local reservoir offsets

机译：加勒比海的海洋水库矫正在本地储层偏移中展示了高岛内部变异性

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The abundance of marine mollusks found in Pre-Columbian archaeological sites in the Caribbean has made them enticing sample types for radiocarbon dating. Unfortunately, a paucity of local marine reservoir corrections (AR) for most of the region limits building chronologies using marine-based carbonates. Here we present a suite of 33 new AR values for 22 islands in both the Greater and Lesser Antilles derived from known-age shells pre-dating A. D. 1950 (i.e., pre-atomic testing) and is the first intensive radiocarbon dating effort in the region to examine AR effects. The spatial coverage and corrections presented here demonstrate wide variation within and between islands across the Antilles, Bahamian archipelago, and islands that skirt the coast of northern South America. Correction values range from 282 +/- 24 yr in Grenada to -547 +/- 36 yr in Anegada. Calibration of published radiocarbon dates on archaeological marine shell using these new AR values demonstrates the need for caution when dating marine shell in the Caribbean, but illustrates the potential for these corrections to provide more accurate radiocarbon chronologies. Research is now focused on identifying the causal mechanisms behind the high variability in Caribbean AR and the implications these data have for refining radiocarbon sequences in the region, particularly for islands where there are currently no AR values.
机译：在加勒比海哥伦布之前的考古遗址中发现了大量的海洋软体动物，这使得它们成为放射性碳年代测定的诱人样本类型。不幸的是，该地区大部分地区缺乏本地海相储层校正（AR），这限制了使用海相碳酸盐岩的建筑年表。在这里，我们为大安的列斯群岛和小安的列斯群岛的22个岛屿提供了一套33个新的AR值，这些AR值来自于公元1950年（即原子试验前）之前的已知年代贝壳，是该地区第一次密集的放射性碳测年工作，以检查AR效应。这里展示的空间覆盖率和校正表明，安的列斯群岛、巴哈马群岛和南美洲北部海岸附近岛屿内部和之间存在巨大差异。修正值范围从格林纳达的282+/-24岁到阿内加达的-547+/-36岁。使用这些新的AR值对考古海洋贝壳上公布的放射性碳年代进行校准，表明在加勒比海海洋贝壳年代测定时需要谨慎，但也说明了这些校正的潜力，以提供更准确的放射性碳年代。目前，研究的重点是确定加勒比海AR高可变性背后的因果机制，以及这些数据对精炼该地区放射性碳序列的影响，特别是对于目前没有AR值的岛屿。

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