墨西哥国立自治大学M.C. Zarazúa-Carbajal研究小组近日取得一项新成果。他们在研究火山渣锥体侵蚀退化的切口时发现，三个火山区中的不同行为反映不同的环境条件。2024年4月26日，国际知名学术期刊《地质学》发表了这一成果。

作用于火山渣锥体的冲积过程促进了水系网络的发展，该网络由平行于火山大厦下坡方向的放射状分布的小沟和沟壑组成。

研究通过将平均侵蚀指数(AEI)方法应用于干旱至半干旱的月球火山口火山场(美国内华达州)的火山渣锥体，并将结果与先前从两个热带火山区(墨西哥中部的Chichinautzin火山区和Parícutin-Tancítaro地区)获得的结果进行比较，以量化排水网络的发展程度。

研究表明，AEI方法在确定地貌年龄关系时是有效的，每个领域应单独校准。此外，三个研究区AEI结果的差异表明，该研究提供了一种量化不同环境下火山区不同冲积侵蚀速率影响的方法，包括先前研究定性推断的干旱环境下冲积过程对锥体的延迟。

附：英文原文

Title: Scoria cone erosional degradation by incision: Different behaviors in three volcanic fields reflect environmental conditions

Author: M.C. Zarazúa-Carbajal, G.A. Valentine, S. De la Cruz-Reyna

Issue&Volume: 2024-04-26

Abstract: 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.

DOI: 10.1130/G52113.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52113.1/638898/Scoria-cone-erosional-degradation-by-incisionredirectedFrom=fulltext