Variations in depositional rates affect the temporal depositional resolutions of proxies used for paleoenvironmental reconstructions; for example, condensation can make reconstructed environmental changes appear very abrupt. This is commonly addressed by transforming proxy data using age models, but this approach is limited to situations where numerical ages are available or can be reliably inferred by correlation. Here we propose a new solution, in which relative age models are constructed based on proxies for depositional rates. As a case study, we use the onset of the late Silurian Lau Carbon Isotope Excursion (LCIE) in Gotland, Sweden. The studied succession is a gradual record of shallowing upward in a tropical, neritic carbonate platform. As proxies for depositional rates we tested thorium concentration, carbonate content, and the concentration of pelagic palynomorphs. These three proxies were used to create relative age models using the previously published DAIME model. We applied these models to transform the δ¹³C_carb values as well as concentrations of selected redox‐sensitive elements. The three relative age models yielded qualitatively similar results. In our case study, variations in depositional rates resulted in peaks of redox proxies appearing up to 76% higher when taken at face value, compared to when accounting for these rates. In the most extreme cases, our corrections resulted in a reversal in the stratigraphic trend of elemental concentrations. This approach can be applied and developed across depositional setting and types of paleoenvironmental proxies. It provides a flexible tool for developing quantitative models to improve our understanding of the stratigraphic record.

中文翻译：

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重建沉积率及其对古环境的影响：以瑞典哥得兰岛的劳碳同位素游览为例

沉积速率的变化会影响用于古环境重建的代理的时间沉积分辨率；例如，凝结会使重建的环境变化看起来非常突然。通常可以通过使用年龄模型来转换代理数据来解决此问题，但是这种方法仅限于可以使用数字年龄或可以通过相关性可靠推断出数字年龄的情况。在这里，我们提出了一种新的解决方案，其中基于沉积速率的代理构建相对年龄模型。作为案例研究，我们使用瑞典哥得兰岛晚志留纪刘氏碳同位素游览（LCIE）的开始时间。所研究的演替是在热带，含碳酸盐碳酸盐岩台地中向上逐渐变浅的逐步记录。作为沉积速率的代理，我们测试了concentration浓度，碳酸盐含量，和上层浮游植物的浓度。这三个代理用于使用先前发布的DAIME模型创建相对年龄模型。我们应用这些模型来转换δ ¹³ Ç_{碳水化合物}值以及选择氧化还原敏感的元素浓度。这三个相对年龄模型得出的定性结果相似。在我们的案例研究中，与考虑这些比率相比，按面值计算，沉积速率的变化导致氧化还原代理的峰高出76％。在最极端的情况下，我们的修正导致元素浓度的地层趋势发生逆转。这种方法可以在沉积环境和古环境代理类型之间应用和发展。它为开发定量模型提供了灵活的工具，以增进我们对地层记录的理解。