Potential for14C Dating of Biogenic Carbonate in Hackberry (Celtis) Endocarps
Potential for14C Dating of Biogenic Carbonate in Hackberry (Celtis) Endocarps
复制标题
朴树 (Celtis) 内果皮中生物碳酸盐的 14C 测年潜力
作者：
Yang Wang;A. Jahren;R. Amundson
朴树内果皮 (Celtissp.) 含有大量（高达 70 wt%）的生物碳酸盐，几乎是纯文石 (CaCO3)。由于其矿物质含量高，朴树内果皮在第三纪和第四纪沉积物中大量发现，并且在许多北美考古遗址中非常常见。我们分析了现代朴树不同成分的 14 C 含量，包括上个世纪已知时间收集的朴树内果皮中的生物碳酸盐。内果皮碳酸盐的 14 C 含量准确地记录了大气中 14 C 的含量。内果皮碳酸盐化石的 14 C 年代与考古和地质遗址中通过其他方法获得的年代相比具有优势，其年代从更新世晚期到全新世早期。因此，我们建议朴树内果皮是 14 C 测年的合适基质，前提是其形态和矿物学完整性得以保留。
Hackberry endocarp (Celtissp.) contains significant amounts (up to 70 wt%) of biogenic carbonate that is nearly pure aragonite (CaCO3). Because of their high mineral content, hackberry endocarps are found abundantly in Tertiary and Quaternary sediments and are very common in many North American archaeological sites. We analyzed the14C content of different components of modern hackberries including the biogenic carbonate in hackberry endocarps collected at known times over the past century. The14C content of the endocarp carbonate accurately records the14C content of the atmosphere.14C dates of fossil endocarp carbonates compared favorably with dates obtained by other means at archaeological and geological sites ranging in age from the late Pleistocene through the early Holocene. We therefore suggest that hackberry endocarp is a suitable substrate for14C dating provided that its morphological and mineralogical integrity is preserved.