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DOI: 10.1002/2016GL068721
论文题名:
Understanding the link between circumferential dikes and eruptive fissures around calderas based on numerical and analog models
作者: Corbi F.; Rivalta E.; Pinel V.; Maccaferri F.; Acocella V.
刊名: Geophysical Research Letters
ISSN: 0094-9552
EISSN: 1944-9283
出版年: 2016
卷: 43, 期:12
起始页码: 6212
结束页码: 6219
语种: 英语
英文关键词: analog models ; caldera ; dike propagation ; eruptive fissure pattern ; finite element models ; topographic unloading
Scopus关键词: Finite element method ; Hydraulic structures ; Unloading ; Air injection ; Analog models ; Caldera ; Dike propagation ; Fissure development ; Fissure patterns ; Magmatic complexes ; Stress orientations ; Levees ; analog model ; caldera ; dike ; felsic rock ; finite element method ; fissure ; mafic rock ; numerical model ; unloading ; volcanic eruption
英文摘要: Active calderas are seldom associated with circumferential eruptive fissures, but eroded magmatic complexes reveal widespread circumferential dikes. This suggests that, while the conditions to emplace circumferential dikes are easily met, mechanisms must prevent them from reaching the surface. We explain this discrepancy with experiments of air injection into gelatin shaped as a volcano with caldera. Analog dikes show variable deflection, depending on the competition between overpressure, Pe, and topographic unloading, Pl; when Pl/Pe = 4.8–5.3, the dikes propagate orthogonal to the least compressive stress. Due to the unloading, they become circumferential and stall below the caldera rim; buoyancy is fundamental for the further rise and circumferential fissure development. Numerical models quantitatively constrain the stress orientation within the gelatin, explaining the observed circumferential dikes. Our results explain how dikes propagate below the rim of felsic and mafic calderas, but only in the latter they are prone to feed circumferential fissures. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977137646&doi=10.1002%2f2016GL068721&partnerID=40&md5=9a1b9b9cd4100e5e205f2a0460821e33
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10515
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: GFZ German Centre for Geosciences, Section 2.1, Telegrafenberg, Germany

Recommended Citation:
Corbi F.,Rivalta E.,Pinel V.,et al. Understanding the link between circumferential dikes and eruptive fissures around calderas based on numerical and analog models[J]. Geophysical Research Letters,2016-01-01,43(12).
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