亥姆霍兹地球科学中心Taylor Schildgen小组近日取得一项新成果。经过不懈努力，他们研究出南巴塔哥尼亚地幔驱动、气候调节的景观演化。该项研究成果发表在2025年12月2日出版的《地质学》上。

该研究组探讨了构造、地球动力学和地表过程在驱动阿根廷巴塔哥尼亚景观演变中的相对重要性，主题是沿shehusamen河和Santa Cruz河（50°S）保存的河流阶地超过250公里的64个新的10Be暴露年龄。阶地年龄在33万年 ~ 150万年之间，与巴塔哥尼亚冰期吻合。研究证实，地貌系统能够直接响应中更新世气候转型驱动下的气候变化：结果显示阶地形成周期转变为10万年，并在约100万年前开始出现阶段性加速下切侵蚀。自100万年以来，区域一致的130-180米/百万年的下切速率表明，该抬升与巴塔哥尼亚板片窗软流圈加热作用相关，而阶段性加速下切则揭示了低黏度地幔中的对流不稳定现象。本研究建立了气候震荡、河流下切侵蚀与地幔驱动的造陆抬升之间的时间关联。

附：英文原文

Title: Mantle-driven, climatically modulated landscape evolution in Southern Patagonia

Author: Victoria M. Fernandes, Andreas Ruby, Fergus McNab, Hella Wittmann, Andrew D. Wickert, Lennart Grimm, Taylor Schildgen

Issue&Volume: 2025-12-02

Abstract: We explore the relative importance of tectonic, geodynamic, and surface processes in driving landscape evolution in Argentine Patagonia using 64 new 10Be exposure ages of fluvial terraces preserved over >250 km along the Shehuén and Santa Cruz rivers (50°S). Terrace ages range from 33 ka to 1.5 Ma and coincide with Patagonian glaciations. We demonstrate that landscapes can respond directly to changes in climate forcing driven by the Mid-Pleistocene Transition: our results reveal a transition to 100-k.y. terrace periodicity, and a transient phase of accelerated incision starting at ca. 1 Ma. A regionally uniform incision rate of 130180 m m.y-1 since 1 Ma suggests uplift linked to asthenospheric heating in the Patagonian slab window, while transient accelerated incision suggests convective instabilities in a low-viscosity mantle. We establish a temporal link between climate oscillations, fluvial incision, and mantle-driven epeirogenic uplift.

DOI: 10.1130/G53764.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G53764.1/721405/Mantle-driven-climatically-modulated-landscape