Detrital zircon U‐Pb data are routinely used to assess provenance in sedimentary systems. However, recent studies have suggested that zircon provenance interpretation may be biased by grain‐size‐dependent selective transport and deposition. In this study, we present zircon grain‐size and U‐Pb data from 11 sandstone and 11 mudstone samples from the late Paleozoic Eagle and Paradox basins to test whether apparent provenance changes between sandstone and mudstone samples can be explained by changes in zircon grain‐size alone. The Eagle and Paradox basins formed in association with the Ancestral Rocky Mountains (ARM). These basins provide an excellent system to test grain‐size/provenance relationships because they are filled with cyclic stratigraphy that records, via grain size and facies changes, flooding/exposure driven by interglacial/glacial cycles. These cycles are interpreted to have substantially altered sediment transport pathways and provenance of ARM‐related sedimentary rocks. Data presented here suggest that although zircon grain size does correlate to sample grain size in most samples, age spectra appear to be independent of grain size. As such, differences in age spectra between sandstone and mudstone samples appear to be the result of changes in relative inputs of two endmember sources: (1) grains eroded from adjacent basement‐cored ARM uplifts and (2) far‐traveled sediment sourced from outside the ARM system. The data presented in this study also provide a successful proof‐of‐concept test for a manual method of determining zircon grain size. This method is simple and straightforward and can be applied to any sample analyzed using the Chromium off‐line targeting software.

中文翻译：

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美国晚古生代悖论和伊格尔盆地碎屑锆石环源的粒度控制

碎屑锆石U-Pb数据通常用于评估沉积系统中的物源。但是，最近的研究表明，锆石的物源解释可能会因晶粒尺寸依赖性的选择性迁移和沉积而有偏差。在这项研究中，我们提供了来自古生代鹰和悖论盆地的11个砂岩和11个泥岩样品的锆石粒度和U-Pb数据，以测试砂岩和泥岩样品之间的明显物产变化是否可以通过锆石晶粒的变化来解释。大小。Eagle和Paradox盆地与祖先的落基山脉（ARM）共同形成。这些盆地提供了一个很好的系统来测试晶粒尺寸/物源关系，因为它们充满了周期性地层，可以通过晶粒大小和相变记录，冰期/冰川周期驱动的洪水/暴晒。这些循环被解释为极大地改变了沉积物的输送途径和与ARM有关的沉积岩的出处。此处提供的数据表明，尽管在大多数样品中锆石晶粒尺寸确实与样品晶粒尺寸相关，但年龄谱似乎与晶粒尺寸无关。因此，砂岩和泥岩样品的年龄谱差异似乎是两个端元来源相对输入量变化的结果：（1）颗粒从相邻的以地下室为中心的ARM隆起侵蚀而来；（2）外部散布的远走沉积物ARM系统。这项研究中提供的数据还提供了一种成功的概念验证测试，可用于确定锆石晶粒尺寸的手动方法。