Search: onr:"swepub:oai:DiVA.org:uu-181586" >
Three-dimensional g...
Three-dimensional geometry of concentric intrusive sheet swarms in the Geitafell and the Dyrfjöll Volcanoes, Eastern Iceland
-
- Burchardt, Steffi, 1982- (author)
- Uppsala universitet,Institutionen för geovetenskaper,Solid Earth Geology,Berggrundsgeologi
-
- Tanner, David C. (author)
- Leibniz Institute for Applied Geophysics, Hannover, Germany
-
- Troll, Valentin R. (author)
- Uppsala universitet,Berggrundsgeologi
-
show more...
-
- Krumbholz, Michael (author)
- Geoscience Center, Georg-August University Göttingen, Göttingen, Germany
-
- Gustafsson, Ludvik E. (author)
- Association of Local Authorities in Iceland, Reykjavik, Iceland
-
show less...
-
(creator_code:org_t)
- Washington, DC : American Geophysical Union (AGU) and the Geochemical Society, 2011
- 2011
- English.
-
In: Geochemistry Geophysics Geosystems. - Washington, DC : American Geophysical Union (AGU) and the Geochemical Society. - 1525-2027. ; 12:7, s. Q0AB09-
- Related links:
-
https://uu.diva-port... (primary) (Raw object)
-
show more...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- Sheet intrusions (inclined sheets and dykes) in the deeply eroded volcanoes of Geitafell and Dyrfjöll,eastern Iceland, were studied at the surface to identify the location, depth, and size of their magmaticsource(s). For this purpose, the measured orientations of inclined sheets were projected in three dimensionsto produce models of sheet swarm geometries. For the Geitafell Volcano, the majority of sheetsconverge toward a common focal area with a diameter of at least 4 to 7 km, the location of which coincideswith several gabbro bodies exposed at the surface. Assuming that these gabbros represent part of the magmachamber feeding the inclined sheets, a source depth of 2 to 4 km below the paleoland surface is derived.A second, younger swarm of steeply dipping sheets crosscuts this gabbro and members of the first swarm.The source of this second swarm is estimated to be located to the SE of the source of Swarm 1, below thepresent‐day level of exposure and deeper than the source of the first swarm. For the Dyrfjöll Volcano,we show that the sheets can be divided into seven different subsets, three of which can be interpretedas swarms. The most prominent swarm, the Njardvik Sheet Swarm, converges toward a several kilometerswide area in the Njardvik Valley at a depth of 1.5 to 4 km below the paleoland surface. Two additionalmagmatic sources are postulated to be located to the northeast and southwest of the main source. Crosscuttingrelationships indicate contemporaneous, as well as successive activity of different magma chambers,but without a resolvable spatial trend. The Dyrfjöll Volcano is thus part of a complex volcanic cluster thatextends far beyond the study area and can serve as fossil analog for nested volcanoes such as Askja, whereasin Geitafell, the sheet swarms seem to have originated from a single focus at one time, thus defining a singlecentral volcanic complex, such as Krafla Volcano.
Keyword
- central volcano
- east Iceland
- inclined sheets
- magma chamber
- three‐dimensional projection
- Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
- Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
- NATURAL SCIENCES
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database