近日，印度物理研究实验室K.B. Kimi及其团队人员对月球上Gruithuisen地区熔岩管进行研究，发现了其在压缩应力作用下的变形。相关论文于2024年5月31日发表在《地质学》杂志上。

团队人员对研究区某熔岩管的不同塌陷和隆起特征进行了形态计量学分析，揭示了从曲线沟道状到椭圆状的8种特征形态。值得注意的是，折皱脊的平均法向应力和应变值为约70MPa和2×10^-3，褶皱脊向北伸展。这些量化参数被用作初始化三维模型的基础。此外，模型的结果接近复制了Gruithuisen地区的变形，强调了挤压应力在熔岩管变形中的重要作用。

这些模型表明，观察到的与熔岩管相关的8个独特特征是由沿三个轴(x, y, z)的位移幅度和方向的差异引起的。该研究揭示了在不同的挤压应力作用下熔岩管的结构变化，并加深了对挤压构造活动和熔岩管特征之间相互作用形成月球表面的方式的理解。

据研究人员介绍，月球Gruithuisen地区的熔岩管非常有趣，因为它具有独特的塌陷坑和凸起特征，为了解月球熔岩管在压缩应力下的潜在形态变形提供了机会。本研究旨在了解Gruithuisen地区熔岩管在压缩应力作用下的形态变形，并将数值模拟和形态计量学分析相结合，以实现这一目标。

附：英文原文

Title: Deformation of the Gruithuisen region lava tube under compressional stress on the Moon

Author: K.B. Kimi, Harish, Harish, K.S. Sharini, Anil Chavan, S. Vijayan

Issue&Volume: 2024-05-31

Abstract: The lava tube in the Gruithuisen region on the Moon is intriguing because it is characterized by a distinctive chain of collapsed pits and raised features, providing an opportunity to understand the potential morphologic deformation of lunar lava tubes under compressional stress. This study aimed to understand the morphological deformation in the Gruithuisen region’s lava tube when subjected to compressional stress. A combination of numerical simulations and morphometric analysis was employed to achieve this objective. The morphometric analysis of different collapsed and raised features associated with a lava tube in the study area revealed eight characteristic morphologies ranging from curvilinear channel-like to elliptical shape. Notably, average normal stress and strain values derived from a wrinkle ridge were found to be ～70 MPa and 2 × 10^-3, respectively, and wrinkle ridges exhibited a northward orientation. These quantified parameters were utilized as the foundation for initializing three-dimensional models. Furthermore, the outcomes of the models closely replicated the deformation in the Gruithuisen region, emphasizing the significant role of compressional stress in the deformation of the lava tube. These models suggest that the observed eight unique features associated with the lava tube arise from disparities in displacement magnitude and direction along three axes (x, y, z). Our research sheds light on the structural transformations of lava tubes when subjected to varying compressional stress and enhances understanding of the ways in which the interplay between compressional tectonic activity and lava tube features has shaped the Moon’s surface.

DOI: 10.1130/G52143.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52143.1/644595/Deformation-of-the-Gruithuisen-region-lava-tuberedirectedFrom=fulltext