S. Racano, P. A. van der Beek, T. F. Schildgen, C. Faccenna, V. Buleo Tebar, D. Cosentino
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引用次数: 0
摘要
通过研究岩石隆起在时间和空间上的变化,可以深入了解驱动山带演变的过程。意大利亚平宁山脉经历了第四纪岩石隆升,形成了今天的地形。在此,我们对亚平宁山脉中北部东侧的 28 个流域进行了线性河流剖面反演,以重建岩石隆升的历史。我们根据宇宙成因核素数据获得的侵蚀率和集水区平均侵蚀率估算出侵蚀系数(K),从而对这些结果进行了校准,并检验了统一或可变的 K 是否能产生一个令人满意地符合独立地质年代约束条件的岩石隆起模型。我们采用了地貌演化模型来证明,尽管在隆升过程中集水区向海大幅延长,我们的反演结果仍然是可靠的。我们的研究结果表明,岩石隆升脉冲开始于大约 3.0-2.5 Ma,与亚平宁山脉开始延伸的时间相吻合,并以∼90 km/Myr的速度向南迁移。重建的最高岩石隆起率(1 km/Myr)出现在亚平宁山脉地块最高的区域。这些结果与其他地区的数值模型和实地证据一致,都显示了与板块断裂有关的快速岩石上升脉冲和隆升迁移。我们的研究结果支持亚平宁半岛中部下的阿德里亚板块断裂及其在第四纪向南传播的假说。此外,研究结果表明,在中更新世之后,亚得里亚海沿岸的岩石隆起率再次上升,与阿普利亚前陆意大利南部东海岸近期的加速隆起同时发生。
Slab Driven Quaternary Rock-Uplift and Topographic Evolution in the Northern-Central Apennines From Linear Inversion of the Drainage System
Investigating rock-uplift variations in time and space provides insights into the processes driving mountain-belt evolution. The Apennine Mountains of Italy underwent substantial Quaternary rock uplift that shaped the present-day topography. Here, we present linear river-profile inversions for 28 catchments draining the eastern flank of the Northern-Central Apennines to reconstruct rock-uplift histories. We calibrated these results by estimating an erodibility coefficient (K) from incision rates and catchment-averaged erosion rates obtained from cosmogenic-nuclide data, and we tested whether a uniform or variable K produces a rock-uplift model that satisfactorily fits independent geochronological constraints. We employ a landscape-evolution model to demonstrate that our inversion results are reliable despite substantial seaward lengthening of the catchments during uplift. Our findings suggest that a rock-uplift pulse started around 3.0–2.5 Ma, coinciding with the onset of extension in the Apennines, and migrated southward at a rate of ∼90 km/Myr. The highest reconstructed rock-uplift rates (>1 km/Myr) occur in the region encompassing the highest Apennine massifs. These results are consistent with numerical models and field evidence from other regions exhibiting rapid rock-uplift pulses and uplift migration related to slab break-off. Our results support the hypothesis of break-off of the Adria slab under the central Apennines and its southward propagation during the Quaternary. Moreover, the results suggest a renewed increase in rock-uplift rates after the Middle Pleistocene along the Adriatic coast, coeval with recent uplift acceleration along the eastern coast of southern Italy in the Apulian foreland.
期刊介绍:
Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged.
Areas of interest for this peer-reviewed journal include, but are not limited to:
The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution
Principles and applications of geochemical proxies to studies of Earth history
The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them
The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales
Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets
The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets
Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.