Linking rift propagation barriers to excess magmatism at volcanic rifted margins

Recent research found distinct along-margin variations in the distribution of seaward-dipping reflectors (SDRs), and abundance of volcanic material was found to be spatially linked to transfer fault systems. We develop a numerical model, which shows that rift-parallel mantle flow and locally enhanced rates of volcanism are the result of delays in rift propagation and segmented opening. Our model suggests that segmentation is one of the major factors in the distribution and localization of rift-related extrusive magmatism.

Figure: Model with sequentially activated segments. Along-strike flow of hot asthenosphere occurs when a new rift segment gets activated causing localised pulses of magmatism and SDR formation.


Cite as:

Koopmann, H., Brune, S., Franke, D., Breuer, S., 2014. Linking rift propagation barriers to excess magmatism at volcanic rifted margins. Geology G36085.1. doi:10.1130/G36085.1

Downloads and Resources:

Link to Paper | Link to Supplementary Information | 3D Model animation | Along-strike cross section pdfs: 0 My delay, 2.5 My delay5 My delay, 7.5 My delay