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| DOI | 10.1111/jmg.12772 |
| Metasomatism of the continental crust and its impact on surface uplift: Insights from reactive-transport modelling | |
| 发表日期 | 2024 |
| ISSN | 0263-4929 |
| EISSN | 1525-1314 |
| 英文摘要 | High-elevation, low-relief continental plateaus are major topographic features and profoundly influence atmospheric circulation, sediment transport and storage, and biodiversity. Although orogenic surface-uplift mechanisms for modern continental plateaus near known plate margins like Tibet are well-characterized, they cannot account for examples in intracontinental settings like the Colorado Plateau. In contrast to canonical plate-tectonic uplift mechanisms, broad-scale hydration-induced metasomatism of the lower crust has been suggested to reduce its density and increase its buoyancy sufficiently to contribute to isostatic uplift. However, the relationships between key petrophysical properties in these environments are not fully quantified, which limits application of this model. Here, we develop a series of petrological models that describe the petrological and topographic effects of fluid-rock interaction in non-deforming continental crust of varying composition. We apply an open-system petrological modelling framework that utilizes reactive-transport calculations to determine the spatial and temporal scales over which mineralogic transformations take place compared with the magnitude of infiltration of aqueous fluids derived from devolatilization of subducting oceanic lithosphere. The buoyancy effect of hydration-induced de-densification is most significant for metabasic lower crust, intermediate for metapelitic crust, and minimal for granodioritic crust. We apply these results to a case study of the similar to 2 km-high Colorado Plateau and demonstrate that under ideal conditions, hydration of its lower-middle crust by infiltrating aqueous fluids released by the Farallon slab during Cenozoic low-angle subduction could have uplifted the plateau surface by a maximum of similar to 1 km over 16 Myr. However, realistically, although hydration likely has a measurable effect on surface tectonics, the uplift of orogenic plateaus is likely dominantly controlled by other factors, such as lithospheric delamination. |
| 英文关键词 | crustal hydration; metasomatism; petrological modelling; plateau uplift |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| WOS记录号 | WOS:001204949200001 |
| 来源期刊 | JOURNAL OF METAMORPHIC GEOLOGY
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/303609 |
| 作者单位 | University of California System; University of California San Diego; Scripps Institution of Oceanography; University of Oxford |
| 推荐引用方式 GB/T 7714 | . Metasomatism of the continental crust and its impact on surface uplift: Insights from reactive-transport modelling[J],2024. |
| APA | (2024).Metasomatism of the continental crust and its impact on surface uplift: Insights from reactive-transport modelling.JOURNAL OF METAMORPHIC GEOLOGY. |
| MLA | "Metasomatism of the continental crust and its impact on surface uplift: Insights from reactive-transport modelling".JOURNAL OF METAMORPHIC GEOLOGY (2024). |
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