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DOI | 10.1002/2017GL073130 |
Propagation and arrest of dikes under topography: Models applied to the 2014 Bardarbunga (Iceland) rifting event | |
Urbani, S.1; Acocella, V.1; Rivalta, E.2; Corbi, F.3 | |
2017-07-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | Italy; Germany; France |
英文摘要 | Dikes along rift zones propagate laterally downslope for tens of kilometers, often becoming arrested before topographic reliefs. We use analogue and numerical models to test the conditions controlling the lateral propagation and arrest of dikes, exploring the presence of a slope in connection with buoyancy and rigidity layering. A gentle downslope assists lateral propagation when combined with an effective barrier to magma ascent, e.g., gelatin stiffness contrasts, while antibuoyancy alone may be insufficient to prevent upward propagation. We also observe that experimental dikes become arrested when reaching a plain before opposite reliefs. Our numerical models show that below the plain the stress field induced by topography hinders further dike propagation. We suggest that lateral dike propagation requires an efficient barrier (rigidity) to upward propagation, assisting antibuoyancy, and a lateral pressure gradient perpendicular to the least compressive stress axis, while dike arrest may be induced by external reliefs. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000406257400026 |
WOS关键词 | MAGMA-FILLED CRACKS ; VOLCANIC EDIFICE ; PHYSICAL-PROPERTIES ; SILL FORMATION ; BENEATH ; DYKES ; FRACTURES ; INTRUSION ; STRESSES ; GELATIN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25984 |
专题 | 气候变化 |
作者单位 | 1.Univ Roma Tre, Dipartimento Sci, Rome, Italy; 2.Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany; 3.Univ Montpellier, Geosci Montpellier Lab, Montpellier, France |
推荐引用方式 GB/T 7714 | Urbani, S.,Acocella, V.,Rivalta, E.,et al. Propagation and arrest of dikes under topography: Models applied to the 2014 Bardarbunga (Iceland) rifting event[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(13). |
APA | Urbani, S.,Acocella, V.,Rivalta, E.,&Corbi, F..(2017).Propagation and arrest of dikes under topography: Models applied to the 2014 Bardarbunga (Iceland) rifting event.GEOPHYSICAL RESEARCH LETTERS,44(13). |
MLA | Urbani, S.,et al."Propagation and arrest of dikes under topography: Models applied to the 2014 Bardarbunga (Iceland) rifting event".GEOPHYSICAL RESEARCH LETTERS 44.13(2017). |
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