Understanding geological time: An innovative fusion of diagenetic and cyclostratigraphic concepts to reconstruct sediment composition, deposition rate, and geological time spans

了解地质时间：成岩和旋回地层概念的创新融合，以重建沉积物成分、沉积速率和地质时间跨度

• 批准号: 498286524
• 负责人: Dr. Theresa Nohl
• 金额: --
• 依托单位: Institut für Paläontologie
• 依托单位国家: 德国
• 项目类别: WBP Position
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/498286524?language=en
• 关键词: Understanding; geological; time; innovative; fusion

Rhythmically alternating carbonate lithologies have been subject of intense discussion in terms of their origin. They are often used as a record of astronomically forced climate change, even though it has been shown that diagenesis can enhance or disguise the environmental signal, or even introduce rhythmicity. The aims of the project are to scrutinise how diagenesis affects original astronomically forced sedimentary cycles, to evaluate which depositional environments and ages are especially affected, and to evaluate how time is distributed within an astronomically forced lithological cycle. To achieve this, two new methods from diagenesis (based on the geochemistry, "vector length methode") and cyclostratigraphy (statistical method, "alpha method") will be applied to different records from IODP cores and outcrop records from different water depths, latitudes and ages with existing interpretations on diagenesis or cyclostratigraphy. Further, a database with data on rhythmically alternating carbonate lithologies will be established and used to archieve the projects objectives. This combination of diagenesis and cyclostratigraphy is unprecedented and holds the potential to test the boundaries of both methods, and to improve the reconstruction of sediment composition, deposition rate and, as a consequence, geological time.

有节奏交替的碳酸盐岩性一直是其起源的激烈讨论的主题。它们经常被用作天文强迫气候变化的记录，尽管已经证明成岩作用可以增强或掩盖环境信号，甚至引入节律性。该项目的目的是仔细研究成岩作用如何影响原始的天文强迫沉积旋回，评估哪些沉积环境和年龄受到特别影响，并评估时间在天文强迫岩性旋回中的分布情况。为了实现这一目标，成岩作用（基于地球化学，“矢量长度法”）和旋回地层学（统计方法，“α法”）的两种新方法将应用于IODP岩心的不同记录和不同水深、纬度和年龄的露头记录以及现有的成岩作用或旋回地层学解释。此外，还将建立一个数据库，其中包含有节奏交替的碳酸盐岩性数据，并用于实现项目目标。成岩作用和旋回地层学的这种结合是前所未有的，有可能测试两种方法的边界，并改善沉积物成分、沉积速率以及地质时间的重建。