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Inside the volcano; three-dimensional magmatic architecture of a buried shield volcano

Faye Walker, Nick Schofield, John Millett, Dave Jolley, Simon Holford, Sverre Planke, Dougal A. Jerram and Reidun Myklebust
Inside the volcano; three-dimensional magmatic architecture of a buried shield volcano
Geology (Boulder) (October 2020) Pre-Issue Publication


The nature and growth of magmatic plumbing systems are of fundamental importance to igneous geology. Traditionally, magma chambers have been viewed as rapidly emplaced bodies of molten rock or partially crystallized "magma mush" connected to the surface by a narrow cylindrical conduit (referred to as the "balloon-and-straw" model). Recent data suggest, however, that magma chambers beneath volcanoes are formed incrementally through amalgamation of smaller intrusions. Here we present the first high-resolution three-dimensional reconstruction of an ancient volcanic plumbing system as a large laccolithic complex. By integrating seismic reflection and gravity data, we show that the approximately 200 km3 laccolith appears to have formed through partial amalgamation of smaller intrusions. The complex appears to have fed both surface volcanism and an extensive sill network beneath the volcanic edifice. Numerous sills are imaged within the volcanic conduit, indicating that magma stalled at various levels during its ascent. Our results reveal for the first time the entire multicomponent plumbing system within a large ancient shield volcano.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: Pre-Issue Publication
Title: Inside the volcano; three-dimensional magmatic architecture of a buried shield volcano
Affiliation: University of Aberdeen, Geology and Petroleum Geology, Aberdeen, United Kingdom
Published: 20201012
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 35
Accession Number: 2020-079586
Categories: Igneous and metamorphic petrologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch maps
N62°00'00" - N62°00'00", W01°00'00" - W01°00'00"
Secondary Affiliation: University of Adelaide, AUS, AustraliaVolcanic Basin Petroleum Research, NOR, NorwayUniversity of Oslo, NOR, NorwayTGS, NOR, Norway
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 202022
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