Show simple item record

dc.contributor.authorEide, Christian Haug
dc.contributor.authorSchofield, Nick
dc.contributor.authorHowell, John Anthony
dc.contributor.authorJerram, Dougal Alexander
dc.description.abstractIgneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of the magma transport system or have low resolution. In the Jameson Land Basin in East Greenland, seismic reflection data and extensive outcrops give unparalleled constraints on mafic intrusions down to 15 km. This dataset shows how sill-complexes develop and how magma is transported from the mantle through sedimentary basins. The feeder zone of the sill-complex is a narrow zone below a basin, where a magmatic underplate body impinges on thinned crust. Magma is transported through the crystalline crust through dykes. Seismic data and published geochemistry indicate that magma is supplied from a magmatic underplate without perceptible storage in crustal magma chambers and crustal assimilation. As magma enters the sedimentary basin, it forms distributed, bowl-shaped sill-complexes throughout the basin. Large magma volumes in sills (4–20 times larger than the Skaergaard Intrusion) and the presence of few dykes highlight the importance of sills in crustal magma transport. On scales smaller than 0.2 km, host-rock lithology, and particularly mudstone tensile strength anisotropy, controls sill architecture in the upper 10 km of the basin, whereas sills are bowl-shaped below the brittle–ductile transition zone. On scales of kilometres and towards basin margins, tectonic stresses and lateral lithological changes dominate architecture of sills.en_US
dc.publisherGeological Society of Londonen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleTransport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenlanden_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.source.journalJournal of the Geological Societyen_US
dc.relation.projectNorges forskningsråd: 193059en_US
dc.relation.projectNorges forskningsråd: 267689en_US
dc.relation.projectNorges forskningsråd: 223272en_US
dc.identifier.citationJournal of the Geological Society. 2021en_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal