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A general model for growth trajectories of linear carbonate platforms
Journal of Sedimentary Research ( IF 2.0 ) Pub Date : 2020-10-06 , DOI: 10.2110/jsr.2020.55
Nicolas Goudemand 1 , Pulkit Singh 1 , Jonathan L. Payne 1
Affiliation  

A key challenge regarding development of carbonate platforms is predicting the temporal pattern of platform-margin progradation, aggradation, retrogradation, and drowning. Numerical forward models of carbonate sedimentation have been widely applied to this problem, shedding substantial light on the roles of sediment production, transport, tectonic subsidence, and eustasy on the evolution of carbonate platforms. However, forward models are typically complex and computationally expensive, preventing comprehensive exploration of parameter space. In addition, the interactions among parameters are often nonlinear, preventing the development of simple expressions relating the position of the platform margin to the governing parameters of the model. To complement the considerable insights derived from numerical forward models, this study presents analytical expressions for the temporal evolution of the position of platform margins using the simplest possible assumptions regarding sediment production and transport. These expressions provide useful null models, deviations from which can be used to identify the particular effects of biology or seawater chemistry on carbonate factories in influencing the development of these important sedimentary deposits. Application of the model to synthetic and outcrop examples demonstrates that these simple equations are useful for parameter estimation that can then be used to guide more detailed, process-based numerical forward models.

中文翻译:

线性碳酸盐平台生长轨迹的通用模型

关于碳酸盐岩平台开发的一个关键挑战是预测平台边缘的渐进,凝结,回生和溺水的时间模式。碳酸盐沉积的数值正演模型已被广泛地应用于该问题,从而大大揭示了沉积物的产生,运移,构造沉降和摇晃对碳酸盐平台演化的作用。但是,正向模型通常很复杂且计算量很大,从而无法全面探究参数空间。另外,参数之间的相互作用通常是非线性的,从而阻止了将平台裕度的位置与模型的控制参数相关联的简单表达式的发展。为了补充从数值正向模型中得出的大量见解,这项研究使用关于沉积物生产和运输的最简单假设,提出了平台边缘位置随时间演变的分析表达式。这些表达式提供了有用的无效模型,可以使用这些模型的偏离来确定生物学或海水化学对碳酸盐工厂的特殊影响,从而影响这些重要沉积物的发育。该模型在合成和露头示例中的应用表明,这些简单的方程式对于参数估计很有用,然后可用于指导更详细的基于过程的数值正向模型。这些表达式提供了有用的无效模型,可以使用这些模型的偏离来确定生物学或海水化学对碳酸盐工厂的特殊影响,从而影响这些重要沉积物的发育。该模型在合成和露头示例中的应用表明,这些简单的方程式对于参数估计很有用,然后可用于指导更详细的基于过程的数值正向模型。这些表达式提供了有用的无效模型,可以使用这些模型的偏离来确定生物学或海水化学对碳酸盐工厂的特殊影响,从而影响这些重要沉积物的发育。该模型在合成和露头示例中的应用表明,这些简单的方程式对于参数估计很有用,然后可用于指导更详细的基于过程的数值正向模型。
更新日期:2020-11-17
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