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Large-volume lateral magma transport from the Mull volcano: An insight to magma chamber processes

Large-volume lateral magma transport from the Mull volcano: An insight to magma chamber processes
Large-volume lateral magma transport from the Mull volcano: An insight to magma chamber processes
Long-distance lateral magma transport within the crust has been inferred for various magmatic systems including oceanic island volcanoes, mid-oceanic ridges, and large igneous provinces. However, studying the physical and chemical properties of active fissure systems is difficult. Hence, this study investigates the movement of magma away from the Mull volcano in the North Atlantic Igneous Province, where erosion has exposed its upper crustal dike networks. Magmatic lineations within dikes indicate that the magma flow in the Mull dike suite changed from near vertical to horizontal within 30 km of the volcanic center. This implies that distal dikes were fed by lateral magma transport from Mull. Geochemical characteristics indicate that many <50 km long dikes have deep crustal signatures, reflecting storage and assimilation in Lewisian basement. Following crystallization and assimilation in the lower crust, magma fed an upper crustal reservoir, where further fractionation and incorporation of Moinian rocks generated felsic compositions. Distal dikes are andesitic and reflect events in which large volumes of mafic and felsic magma were combined by mixing between lower and upper crustal reservoirs to generate the 30–80 km3 required to supply the long-distance dikes. Once propagated, compositions along dikes were not significantly affected by assimilation and crystallization. Supplying the distal dikes with magma would have required a large-scale evacuation of the crustal reservoirs that acted as a potential trigger for explosive volcanism and the caldera formation recorded in Mull central complex.
1525-2027
1618-1640
Ishizuka, Osamu
1fb98a88-bff7-4200-a09d-92ddf1616058
Taylor, Rex N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Geshi, Nobuo
0974d7ec-3252-41ca-b2b7-ba9c5c2a2067
Mochizuki, Nobutatsu
e9627183-9d55-45e4-b2a6-79bf70543d25
Ishizuka, Osamu
1fb98a88-bff7-4200-a09d-92ddf1616058
Taylor, Rex N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Geshi, Nobuo
0974d7ec-3252-41ca-b2b7-ba9c5c2a2067
Mochizuki, Nobutatsu
e9627183-9d55-45e4-b2a6-79bf70543d25

Ishizuka, Osamu, Taylor, Rex N., Geshi, Nobuo and Mochizuki, Nobutatsu (2017) Large-volume lateral magma transport from the Mull volcano: An insight to magma chamber processes. Geochemistry, Geophysics, Geosystems, 18 (4), 1618-1640. (doi:10.1002/2016GC006712).

Record type: Article

Abstract

Long-distance lateral magma transport within the crust has been inferred for various magmatic systems including oceanic island volcanoes, mid-oceanic ridges, and large igneous provinces. However, studying the physical and chemical properties of active fissure systems is difficult. Hence, this study investigates the movement of magma away from the Mull volcano in the North Atlantic Igneous Province, where erosion has exposed its upper crustal dike networks. Magmatic lineations within dikes indicate that the magma flow in the Mull dike suite changed from near vertical to horizontal within 30 km of the volcanic center. This implies that distal dikes were fed by lateral magma transport from Mull. Geochemical characteristics indicate that many <50 km long dikes have deep crustal signatures, reflecting storage and assimilation in Lewisian basement. Following crystallization and assimilation in the lower crust, magma fed an upper crustal reservoir, where further fractionation and incorporation of Moinian rocks generated felsic compositions. Distal dikes are andesitic and reflect events in which large volumes of mafic and felsic magma were combined by mixing between lower and upper crustal reservoirs to generate the 30–80 km3 required to supply the long-distance dikes. Once propagated, compositions along dikes were not significantly affected by assimilation and crystallization. Supplying the distal dikes with magma would have required a large-scale evacuation of the crustal reservoirs that acted as a potential trigger for explosive volcanism and the caldera formation recorded in Mull central complex.

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Ishizuka_et_al-2017-Geochemistry,_Geophysics,_Geosystems - Version of Record
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e-pub ahead of print date: 19 April 2017
Organisations: Ocean and Earth Science, Geochemistry

Identifiers

Local EPrints ID: 411926
URI: http://eprints.soton.ac.uk/id/eprint/411926
ISSN: 1525-2027
PURE UUID: 2f713c04-37a6-41e6-988d-827d50e9fbc2
ORCID for Rex N. Taylor: ORCID iD orcid.org/0000-0002-9367-0294

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Date deposited: 30 Jun 2017 16:30
Last modified: 28 Apr 2022 05:22

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Contributors

Author: Osamu Ishizuka
Author: Rex N. Taylor ORCID iD
Author: Nobuo Geshi
Author: Nobutatsu Mochizuki

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