Join us for an upcoming EarthByte Seminar featuring Luca Magri, Postdoctoral Researcher in the EarthByte Group at the School of Geosciences, University of Sydney. Luca will be presenting on “Post-Emplacement Rifting of Oceanic Large Igneous Provinces,” sharing fresh insights and innovative methods in geoscience.
Date: November 27
Time: 11:00 a.m. – 12:00 p.m. AEDT
Location: Room 449 (Conference Room), Madsen Building (F09), School of Geosciences
We look forward to seeing you there in person or joining us online!
https://uni-sydney.zoom.us/j/88229147852?from=addon
Post-Emplacement Rifting of Oceanic Large Igneous Provinces
Abstract
Oceanic Large Igneous Provinces (LIPs) are scattered across the global seafloor, typically formed by mantle plumes at divergent plate boundaries and in intraplate settings. Their inaccessibility limits our understanding of post-emplacement evolution, particularly regarding the role of extensional processes. Significant lithospheric weakening and break up of oceanic LIPs result from plume-driven thermal weakening combined with extension at divergent plate boundaries. Fragmentation in the Eocene is linked to the ~50 Ma plate reorganization that triggered spreading ridge jumps, while Cretaceous separations are associated with thermal weakening, rapid extension rates, warm lithosphere, and the ~100 Ma major plate reorganization. Some LIPs have not rifted apart, likely due to their distance from mantle plumes and plate boundaries. ASPECT numerical models and observational data from the Kerguelen Plateau-Broken Ridge rift system support these observations and show that the rift flanks of oceanic LIPs uplift to shallow marine and subaerial conditions during early rifting before subsiding.
