Abstract Late Visean platform interior carbonate strata of northern England and Wales have traditionally been interpreted to comprise shallowing-up cyclothems, the upper boundaries of which are marked by unconformities that record subaerial exposure events. These strata were deposited during what is understood to be a greenhouse-to-icehouse transition, and the cyclothems are assumed to reflect glacioeustatic sea-level oscillations associated with this climatic change. Importantly, these interpretations reflect a qualitative model which assumes that facies respond in a simple way to water depth variations and so migrate and stack in a predictable pattern as eustatic sea-level fluctuates. Exposure surfaces and most facies are, however, laterally discontinuous across the platform tops. Quantitative statistical analysis and simple 1D stratigraphic forward modelling suggest that the observed vertical facies stacking patterns on the Derbyshire and North Wales Platforms are not cyclical. The most ordered arrangement of facies that could be interpreted as “ideal cycles” in each section are variable within and across the platforms. This observational and analytical evidence suggests that instead of a simple, dominant external glacioeustatic forcing on sedimentation, a model commonly proposed for the Late Visean carbonate strata of northern England and Wales, strata were deposited as a facies mosaic, under variable hydrodynamic conditions influenced by autogenic processes as well as local environmental fluctuations in salinity and temperature, and perhaps in conjunction with glacioeustasy and syn-rift tectonic processes which occurred from metre-scale to kilometre-scale, as suggested by the ideal cycles.

中文翻译：

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密西西比 (Viséan) 碳酸盐平台内部解剖，英国：沉积循环、冰川和相马赛克

摘要 英格兰北部和威尔士北部的晚 Visean 台地内部碳酸盐岩地层传统上被解释为包括变浅的回旋线，其上边界以记录地下暴露事件的不整合面为标志。这些地层是在被理解为温室到冰库的过渡期间沉积的，并且假设环流线反映了与这种气候变化相关的冰川静水海平面振荡。重要的是，这些解释反映了一个定性模型，该模型假设相以简单的方式响应水深变化，因此随着海平面的波动以可预测的模式迁移和叠加。然而，暴露表面和大多数相在平台顶部横向不连续。定量统计分析和简单的一维地层正演模型表明，在德比郡和北威尔士平台上观察到的垂直相堆积模式不是周期性的。每个部分中可以被解释为“理想旋回”的最有序的相排列在平台内和平台之间是可变的。这一观察和分析证据表明，在受自生作用影响的可变水动力条件下，通常为英格兰北部和威尔士北部的晚维森碳酸盐岩地层提出的模型不是简单的、占主导地位的外部冰川静力强迫沉积，而是以相镶嵌的形式沉积。过程以及盐度和温度的局部环境波动，