1 / 8

Reviewed by Richard Fletcher

Insights to extensional processes during magma assisted rifting: Evidence from aligned scoria cones. Reviewed by Richard Fletcher. Overview. Studies of continental or passive margin rifting in and around the Ethiopian rift zone.

howell
Download Presentation

Reviewed by Richard Fletcher

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Insights to extensional processes during magma assisted rifting: Evidence from aligned scoria cones. Reviewed by Richard Fletcher

  2. Overview • Studies of continental or passive margin rifting in and around the Ethiopian rift zone. • Faulting in rift zone, may in part, be due to magmatic intrusions. • Alignment of scoria cones and flows allow for insight to development and lifespan of spreading zones. • Preferential Lithospheric thinning plays a role in the intrusions of magmas.

  3. Local Overview

  4. Continental Rifts • Generally characterized by the relatively broad zones of ‘mechanical’ extension in which faulting and stretching of the lithosphere accommodates strain. The broad reach of initial strain must shift towards narrow zones of magma intrusion at a new oceanic spreading centre.

  5. Continental Rifts

  6. Magma Induced Rifting • Thought to have caused extension but is now thought to be a by-product of strains. • Dike induced normal faulting aligns with more developed rifts such as Iceland. • Other studies show that magma may ascend through tail-cracks, releasing bends, extensional relay zones, and fault intersections.

  7. Recap • Scoria cones align with faulting along rift zone. • Extruding magma shows development of spreading center. • Intrusive magma now the cause of continued extension and strain. • In real time we are witnessing the development of and oceanic spreading center.

  8. Thanks!!!

More Related