Alluvial processes acting on scoria cones cause the development of a drainage network composed of radially distributed rills and gullies parallel to the volcanic edifice's downslope direction. We quantify the degree of drainage network development by applying the Average Erosion Index (AEI) method to scoria cones from the arid to semi-arid Lunar Crater volcanic field (Nevada, United States) and comparing our results with previously obtained results from two tropical volcanic fields (Sierra Chichinautzin volcanic field and the Parícutin-Tancítaro region, both in central Mexico). We show that the AEI method is useful in determining geomorphic age relations when calibrated separately for each field. Furthermore, the differences in AEI results for the three studied fields indicate that the method provides a way of quantifying the effects of different alluvial erosion rates at volcanic fields across various environments, including a delay in alluvial processes on cones in arid settings that has been qualitatively inferred by previous studies.

中文翻译：

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火山渣锥因切割而侵蚀退化：三个火山场的不同行为反映了环境条件


作用于火山渣锥的冲积过程导致排水网络的发展，该排水网络由与火山建筑物下坡方向平行的放射状分布的细沟和沟壑组成。我们通过对干旱至半干旱月球火山口火山场（美国内华达州）的火山渣锥应用平均侵蚀指数（AEI）方法来量化排水网络的发育程度，并将我们的结果与之前从两个热带火山获得的结果进行比较油田（Sierra Chichinautzin 火山田和 Parícutin-Tancítaro 地区，均位于墨西哥中部）。我们证明，当对每个区域进行单独校准时，AEI 方法在确定地貌年龄关系方面非常有用。此外，三个研究领域 AEI 结果的差异表明，该方法提供了一种量化不同环境下火山田不同冲积侵蚀速率影响的方法，包括干旱环境中锥体冲积过程的延迟，这已被定性根据之前的研究推断。