近日，美国加州大学Dylan A. Vasey和德国地球科学研究中心Frank Zwaan的团队取得一项新突破。他们的研究揭示了裂谷历史对陆内裂谷反转造山带构造样式的影响。相关论文于2024年3月1日发表在《地质学》杂志上。

研究建立了陆内裂谷反演数值模型，以探讨裂谷结构、裂谷持续时间、裂谷后冷却和辐合速度等参数对造山带构造的影响。研究模型再现了裂谷反转造山带的自然变异性，并可将其分为三种端元类型：不对称俯冲(AU)、分布增厚(DT)和局部极性翻转(PF)。与宽裂谷相比，窄裂谷的反转往往会产生更多局部变形的造山带(AU型和PF型)。然而，所研究参数的多种组合可以产生相同的结构样式。

研究模型表明造山构造与反转前后条件之间没有独特的关系。由于裂谷反转造山的样式高度依赖于反转之前的裂谷历史，因此了解裂谷反转之前的地质历史对于将造山构造转化为产生该构造的过程至关重要。

据悉，虽然许多碰撞造山带是在两个大陆之间的大洋岩石圈俯冲后形成的，但有些造山带是由大陆裂谷继承的构造反转，并在大陆内部产生应变局部化的结果。陆内裂谷反转造山带表现出一系列的构造样式，但这种可变性的根本原因尚未得到广泛探讨。

附：英文原文

Title: Impact of rift history on the structural style of intracontinental rift-inversion orogens

Author: Dylan A. Vasey, John B. Naliboff, Eric Cowgill, Sascha Brune, Anne Glerum, Frank Zwaan

Issue&Volume: 2024-03-01

Abstract: Although many collisional orogens form after subduction of oceanic lithosphere between two continents, some orogens result from strain localization within a continent via inversion of structures inherited from continental rifting. Intracontinental rift-inversion orogens exhibit a range of structural styles, but the underlying causes of such variability have not been extensively explored. We use numerical models of intracontinental rift inversion to investigate the impact of parameters including rift structure, rift duration, post-rift cooling, and convergence velocity on orogen structure. Our models reproduce the natural variability of rift-inversion orogens and can be categorized using three endmember styles: asymmetric underthrusting (AU), distributed thickening (DT), and localized polarity flip (PF). Inversion of narrow rifts tends to produce orogens with more localized deformation (styles AU and PF) than those resulting from wide rifts. However, multiple combinations of the parameters we investigated can produce the same structural style. Thus, our models indicate no unique relationship between orogenic structure and the conditions prior to and during inversion. Because the style of rift-inversion orogenesis is highly contingent upon the rift history prior to inversion, knowing the geologic history that preceded rift inversion is essential for translating orogenic structure into the processes that produced that structure.

DOI: 10.1130/G51489.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G51489.1/635785/Impact-of-rift-history-on-the-structural-style-of