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Dr. Craig Magee - Continental passive margins: Where are all the dykes?

Hovedinnhold

Dear colleagues,

From the 23-25th of April, we are running a workshop at the department on igneous intrusions in sedimentary basins. Some of the participants will give presentations at the department during this time. 

The first presentation, for Monday April 23rd, will be given by Craig Magee from Imperial College, London in the PhD lunchroom.

See details below.

Best regards
Christian Haug Eide

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Title:
Continental passive margins: Where are all the dykes?

Presenter:
Dr. Craig Magee
Junior Research Fellow
Department of Earth Science & Engineering
Imperial College, London

When:
Monday 23rd of April
12:15

Where:
PhD lunch room, 3rd floor

Abstract:
Dykes are key components of volcanic plumbing systems and Large Igneous Provinces. Over the last 20 years, we have also recognised that during magma-assisted continental break-up, the intrusion of localised dyke swarms can accommodate and may drive extension. Given the vast areal coverage of continental passive margins, many of which have experienced magmatism to some extent, it may be expected that many contain dykes and dyke swarms. Such dykes and dyke swarms could have significantly influenced the evolution of passive margins and the development of petroleum systems. However, whilst igneous sills and inclined sheets are commonly imaged in seismic reflection data, the sub-vertical nature of dykes means that they have rarely been recognised on passive margins. We thus have little idea how dykes and dyke swarms: (1) are distributed across the passive margins; (2) influence margin evolution; or (3) impact hydrocarbon generation, migration, and accumulation. Here, I discuss how dykes can be delimited in seismic reflection data offshore southern Norway and NW Australia, providing a means for recognising dykes and dyke swarms on continental margins worldwide.