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.

韵律交替的碳酸盐岩岩性在其成因方面一直是激烈讨论的主题。它们经常被用作天文学强迫气候变化的记录，尽管已经表明成岩作用可以增强或掩盖环境信号，甚至引入节奏性。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周期，以评估哪些沉积环境和年龄特别受到影响，并评估时间是如何分布在一个天文强迫岩性周期。为了实现这一点，两种新的方法，从成岩作用（基于地球化学，“矢量长度法”）和旋回地层学（统计方法，“阿尔法法”）将应用于不同的记录从IODP核心和露头记录从不同的水深，纬度和年龄与现有的解释成岩作用或旋回地层。此外，还将建立一个数据库，其中载有关于碳酸盐岩有节奏地交替变化的数据，并用于实现项目目标。这种成岩作用和旋回地层学的结合是前所未有的，并有可能测试这两种方法的界限，并改善沉积物成分，沉积速率，因此，地质时间的重建。