Includes the following sessions:
SM4.4. Hotspots, LIPs and LLSVPs: a global investigation with joint constraints from geochemistry, seismology and geodynamics
Convenors: Maria Tsekhmistrenko (maria.tsekhmistrenko@gmail.com), Eva Bredow (eva.bredow@gfz-potsdam.de), Juliane Dannberg (juliane.dannberg@ufl.edu)
Seismic tomography images large low-velocity provinces (LLVPs) at the core-mantle boundary (CMB), deep mantle plumes, and the connection between them. Geochemistry provides constraints on the age and nature of the material sampled by plumes. Geodynamic modelling suggests interaction of subducting slabs with low-velocity piles at the CMB and traces the geographical source of erupted material. What is needed now is to combine approaches and confront observations from the different fields to build a clear picture of the link between deep structures and surface expressions in volcanoes.
This session aims to bring together scientists from these different fields to better constrain the complex processes in the mantle at all depths with a focus on mantle plumes. We invite contributions from (1) seismic observations and seismic tomography models of mantle plumes and LLSVPs. (2) geodynamic modelling on the origin of LLSVPs and their connection to mantle plumes. (3) tectonic studies with new data (or old data with new flavour). (4) geochemical and petrological studies constraining the nature and evolution of thermochemical plumes. (5) all studies that use novel data collection and visualization techniques to further understand deep mantle structures and their connections to the surface observables.
SSP2.14. Volcanism, impacts, and extinctions: links between deep time and the Anthropocene
Convenors: Thierry Adatte (thierry.adatte@unil.ch), David Bond (d.bond@hull.ac.uk), Alicia Fantasia (alicia.fantasia@unil.ch), Sverre Planke (planke@vbpr.no), Nicolas Thibault (nt@ign.ku.dk)
We are presently facing the 6th mass extinction, what can be learnt from the past?
The session will focus on the six major Phanerozoic mass extinctions including the Anthropocene one, but contributions from other environmental crises (e.g. OAEs, PETM) are also welcome.