Change search
ReferencesLink to record
Permanent link

Direct link
Effusive and explosive volcanism on the ultraslow-spreading Gakkel Ridge, 85 degrees E
Show others and affiliations
2012 (English)In: Geochemistry Geophysics Geosystems, ISSN 1525-2027, Vol. 13, Q10005- p.Article in journal (Refereed) Published
Abstract [en]

We use high-definition seafloor digital imagery and multibeam bathymetric data acquired during the 2007 Arctic Gakkel Vents Expedition (AGAVE) to evaluate the volcanic characteristics of the 85 degrees E segment of the ultraslow spreading Gakkel Ridge (9 mm yr(-1) full rate). Our seafloor imagery reveals that the axial valley is covered by numerous, small-volume (order similar to 1000 m(3)) lava flows displaying a range of ages and morphologies as well as unconsolidated volcaniclastic deposits with thicknesses up to 10 cm. The valley floor contains two prominent volcanic lineaments made up of axis-parallel ridges and small, cratered volcanic cones. The lava flows appear to have erupted from a number of distinct source vents within the similar to 12-15 km-wide axial valley. Only a few of these flows are fresh enough to have potentially erupted during the 1999 seismic swarm at this site, and these are associated with the Oden and Loke volcanic cones. We model the widespread volcaniclastic deposits we observed on the seafloor as having been generated by the explosive discharge of CO2 that accumulated in (possibly deep) crustal melt reservoirs. The energy released during explosive discharge, combined with the buoyant rise of hot fluid, lofted fragmented clasts of rapidly cooling magma into the water column, and they subsequently settled onto the seafloor as fall deposits surrounding the source vent.

Place, publisher, year, edition, pages
2012. Vol. 13, Q10005- p.
Keyword [en]
mid-ocean ridge, seafloor morphology, submarine explosive volcanism, ultraslow spreading
National Category
URN: urn:nbn:se:su:diva-82424DOI: 10.1029/2012GC004187ISI: 000309612900001OAI: diva2:567893


Available from: 2012-11-14 Created: 2012-11-14 Last updated: 2012-11-14Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Jakobsson, Martin
By organisation
Department of Geological Sciences
In the same journal
Geochemistry Geophysics Geosystems

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 30 hits
ReferencesLink to record
Permanent link

Direct link