DOI: 10.1002/2015GL065087
论文题名: Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland
作者: Urbani S. ; Trippanera D. ; Porreca M. ; Kissel C. ; Acocella V.
刊名: Geophysical Research Letters
ISSN: 0094-8634
EISSN: 1944-8365
出版年: 2015
卷: 42, 期: 15 起始页码: 6306
结束页码: 6313
语种: 英语
英文关键词: dike
; magmatic system
; rift
Scopus关键词: Aspect ratio
; Hydraulic structures
; Levees
; Magnetic anisotropy
; Magnetic susceptibility
; Anisotropy of magnetic susceptibility
; Geophysical data
; Magmatic systems
; Orders of magnitude
; Plate boundaries
; Regional tectonics
; Rift
; Surface observation
; Tectonics
; crustal deformation
; dike
; geophysical method
; magmatism
; magnetic anisotropy
; plate boundary
; rifting
; tectonic evolution
; Iceland
英文摘要: Recent rifting episodes highlight the role of magmatic systems with propagating dikes on crustal spreading. However, our knowledge of magmatic systems is usually limited to surface observations and geophysical data. Eastern Iceland allows direct access to extinct and eroded deeper magmatic systems. Here we collected field structural and AMS (anisotropy of magnetic susceptibility) data on 187 and 19 dikes, respectively, in the 10-12 Ma old Alftafjordur magmatic system. At a paleodepth of ∼1.5 km, the extension due to diking is at least 1-2 orders of magnitude larger than that induced by regional tectonics, confirming magmatism as the key mechanism for crustal spreading. This magma-induced extension, inferred from the aspect ratio of the magmatic system, was of ∼8 mm/yr, lower than the present one. AMS data suggest that most of dikes have geometrically normal fabric, at least at the margins, consistent with prevalent subvertical magma flow and propagation. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940447408&doi=10.1002%2f2015GL065087&partnerID=40&md5=a3600e2dffb531fe9c51397eed7840d3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8250
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: Dipartimento di Scienze, Università Roma Tre, Rome, Italy
Recommended Citation:
Urbani S.,Trippanera D.,Porreca M.,et al. Anatomy of an extinct magmatic system along a divergent plate boundary: Alftafjordur, Iceland[J]. Geophysical Research Letters,2015-01-01,42(15).