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首页> 外文期刊>Quaternary geochronology >Time-integrating cosmogenic nuclide inventories under the influence of variable erosion, exposure, and sediment mixing
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Time-integrating cosmogenic nuclide inventories under the influence of variable erosion, exposure, and sediment mixing

机译：在可变侵蚀，曝光和沉积物混合的影响下，时间整合美容核素库存

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摘要

Cosmogenic nuclide concentrations in rocks and sediments are widely used to study the evolution of landscapes that have experienced complex exposure/burial and erosion histories. Measured nuclide concentrations are typically compared with those obtained by time-integrating hypothetical histories of erosion and exposure. The presence of erosion, in particular, complicates the time-integration of nuclide concentrations, because erosion removes nuclides while at the same time increasing their production in new material advected towards the surface. This relative movement between sample and surface calls for a choice between a Eulerian reference frame, in which the integration point is fixed relative to the surface, or a Lagrangian reference frame, in which the integration point rides the sample on its way to the surface. The equations developed in the early 1990s to compute changes in cosmogenic nuclide inventories for geological settings undergoing steady erosion are now used routinely, but they are not directly applicable for time-integrating nuclide concentrations related to variable exposure and erosional transience. In this study, we lay out the fundamental equations associated with the Eulerian and Lagrangian approaches to compute cosmogenic nuclide concentrations under the influence of variable exposure and erosion, and discuss the pros and cons of the two approaches for different scenarios. We then extend our analysis to unconsolidated sediment/soil profiles by outlining a new and flexible approach to modelling cosmogenic-nuclide depth profiles that include depth-dependent mixing processes, combined with variable erosion rates and complex exposure/burial histories. We conclude with a few guidelines for reporting the steps involved with computing cosmogenic nuclide concentrations in geological settings influenced by variable exposure and erosional transience.
机译：岩石和沉积物中的富含核素核素浓度被广泛用于研究经历复杂的暴露/埋葬和侵蚀历史的景观的演变。通常将测量的核素浓度与通过时间侵蚀和暴露的假想历史获得的核浓度进行比较。特别是侵蚀的存在使核素浓度的时间结合起来，因为侵蚀除去核素，同时增加其在朝向表面的新材料中的生产。样品和表面之间的这种相对运动在欧拉方参考帧之间进行选择，其中集成点相对于表面固定，或者是集成点在其到表面的方式上乘以样品的拉格朗日参考帧。在20世纪90年代初期开发的等式，以计算正在经常使用稳定侵蚀的地质环境中的富含核素核素库存的变化，但它们不可用于时间整合与可变暴露和侵蚀性交相关的核素浓度。在这项研究中，我们布置了与欧拉和拉格朗日方法相关的基本方程，以在可变暴露和侵蚀的影响下计算富含核素浓度，并讨论两种方法的不同情景的利弊。然后，通过概述包括深度依赖性混合过程的宇宙 - 核素深度型材建模的新的和灵活的方法，将我们的分析扩展到未掩盖的沉积物/土壤分布。结合可变侵蚀率和复杂的暴露/埋葬历史。我们结束了一些关于报告通过可变暴露和侵蚀性转诊的地质环境中计算的富含核酸核素浓度相关的步骤的指导方针。

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