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| DOI | 10.1016/j.tecto.2020.228458 |
| The effect of slab gaps on subduction dynamics and mantle upwelling | |
| Király Á.; Portner D.E.; Haynie K.L.; Chilson-Parks B.H.; Ghosh T.; Jadamec M.; Makushkina A.; Manga M.; Moresi L.; O'Farrell K.A. | |
| 发表日期 | 2020 |
| ISSN | 00401951 |
| 卷号 | 785 |
| 英文摘要 | Gaps within a subducting plate can alter the surrounding mantle flow field and the overall subduction zone dynamics by allowing hot sub-slab mantle to flow through the gaps and into the mantle wedge. This through-slab flow can produce melting of the slab gap edges as well as significant upwelling that can lead to anomalous alkaline volcanism and/or dynamic uplift in the overriding plate, while the altered mantle flow patterns affect the trench evolution. Numerous geodynamic models have investigated the processes that form slab gaps, but few studies have examined the dynamics of slab gap-altered mantle flow, its effects on trench morphology and kinematics, or the controlling parameters on these processes. Here, laboratory subduction models with a pre-cut gap in a subducting silicone plate are used to explore how slab gap size, and slab gap depth influence the surrounding mantle flow field and trench dynamics. Results suggest that both the vertical extent and the depth of the top (trailing edge) of the slab gap are crucial parameters for modulating overall subduction dynamics. They show that a slab gap, which occurs near the surface and initially comprises 30% of the subducting plate width, can extend enough vertically in the slab to produce significant vertical flow through the gap. Changes to the trench geometry and kinematics are also evident in the models, such that double- and triple-arc geometries are formed during subduction of a shallow slab gap. All of these results are consistent with observations of slab gaps and their induced surface expressions, or the lack thereof, in Eastern Anatolia, East Java, Italy, and Argentina. © 2020 |
| 关键词 | Analog modelingMantle flowPIVSlab gapSubduction dynamics |
| 英文关键词 | Flow fields; Kinematics; Silicones; Alkaline volcanism; Controlling parameters; Crucial parameters; Geodynamic models; Mantle upwellings; Subducting plate; Subduction dynamics; Surface expression; Morphology; mantle upwelling; plate tectonics; slab; subduction zone; trench; uplift; Anatolia; Argentina; East Java; Indonesia; Italy; Turkey |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207792 |
| 作者单位 | Centre for Earth Evolution and Dynamics, University of Oslo, Norway; Department of Geosciences, University of Arizona, United States; Department of Terrestrial Magnetism, Carnegie Institution for Science, United States; Department of Geology, University at Buffalo, SUNY, United States; U.S. Geological Survey, National Earthquake Information Center, United States; Department of Geosciences, University of Connecticut, United States; Department of Earth & Atmospheric Sciences, University of Houston, United States; Institute for Computational and Data Sciences, University at Buffalo, SUNY, United States; Research School of Earth Sciences, Australian National University, Canberra, Australia; Department of Earth and Planetary Science, University of California, Berkeley, United States; School of Earth Sciences, University of Melbourne, Melbourne, Australia; Department of Earth and Environmental Sciences, University of Kentucky, United States |
| 推荐引用方式 GB/T 7714 | Király Á.,Portner D.E.,Haynie K.L.,et al. The effect of slab gaps on subduction dynamics and mantle upwelling[J],2020,785. |
| APA | Király Á..,Portner D.E..,Haynie K.L..,Chilson-Parks B.H..,Ghosh T..,...&O'Farrell K.A..(2020).The effect of slab gaps on subduction dynamics and mantle upwelling.Tectonophysics,785. |
| MLA | Király Á.,et al."The effect of slab gaps on subduction dynamics and mantle upwelling".Tectonophysics 785(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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