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首页> 外文期刊>Quaternary geochronology >Cosmogenic isotope burial dating of fluvial sediments from the Lower Rhine Embayment, Germany
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Cosmogenic isotope burial dating of fluvial sediments from the Lower Rhine Embayment, Germany

机译：来自德国下莱茵河谷的河流沉积物的宇宙成因同位素埋葬年代

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Cosmogenic isotope burial dating, using ~(10)Be and ~ (26)Al, was applied to Plio-Pleistocene fluvial successions from the Lower Rhine Embayment, Germany. The approach consists of three principal steps: (1) measurement of cosmogenic nuclides in depth profiles, (2) modelling of hypothetical nuclide concentrations based on a first-order conceptualisation of the geological context and the principal succession of depositions and subsequent erosional and burial phases, and (3) using parameter estimation to identify values for the a priori unknown model parameters (burial age, initial nuclide concentrations, terrace erosion rates) that result in minimal disagreement between hypothetical and measured nuclide concentrations.The Late Pliocene Kieseloolite Formation was dated to 3650 ± 1490 ka and the Early Pleistocene Waalre Formation to 900 ± 280 ka. The unconformably overlying Upper Terrace Formation revealed ages of 740 ± 210 ka and 750 ± 250 ka for the two different sites. These findings are in good agreement with independent age control derived by bio-, magneto-, and litho-stratigraphy. Furthermore, identifiability and uncertainty analysis reveal a relationship between burial depth and sensitivity of isotope concentrations to burial age and erosion rate. Our results indicate that using shallower buried samples would enable a considerably more robust estimation of the burial age and the terrace erosion rate. Uncertainties arose mainly from nuclide measurements, and not from the uncertainties derived from modelling or insufficient knowledge of nuclide production and decay properties.
机译：使用〜（10）Be和〜（26）Al的宇宙成因同位素埋藏年代测定法已应用于德国下莱茵河谷的上新世更新世河流相演替。该方法包括三个主要步骤：（1）在深度剖面中测量宇宙成因核素;（2）基于对地质环境和沉积物的主要演替以及随后的侵蚀和埋藏阶段的一级概念，对假设的核素浓度进行建模（3）使用参数估计来确定先验未知模型参数（埋葬年龄，初始核素浓度，阶地侵蚀速率）的值，这些参数导致假设的和测量的核素浓度之间的差异最小。 3650±1490 ka和早更新世Waalre组至900±280 ka。不整合的上层台地层揭示了两个不同地点的年龄分别为740±210 ka和750±250 ka。这些发现与通过生物，地磁和岩性地层学得出的独立年龄控制非常吻合。此外，可识别性和不确定性分析揭示了埋藏深度与同位素浓度对埋葬年龄和侵蚀速率的敏感性之间的关系。我们的结果表明，使用较浅的埋藏样本将能够对埋葬年龄和阶地侵蚀速率进行更可靠的估计。不确定性主要是由核素测量引起的，而不是由于建模或对核素产生和衰变特性的了解不足而产生的不确定性。

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