Includes the following sessions:
SSP1.3 Mass extinctions and environmental changes throughout the geological time: causes and consequences
Convenors: Alicia Fantasia (alicia.fantasia@univ-lyon1.fr), Thierry Adatte (thierry.adatte@unil.ch), Sverre Planke (sverre.planke@geo.uio.no), David Bond (d.bond@hull.ac.uk), Eric Font (font_eric@hotmail.com)
Mass extinctions and severe environmental changes in the Phanerozoic are temporarily associated with large volcanic eruptions and meteorite impacts, suggesting causal relationships. This session invites contributions presenting new data and results from the end-Ordovician, Late and end-Devonian, end-Permian, end-Triassic, end-Cretaceous, and other paleoenvironmental crises, such as the Paleocene-Eocene Thermal Maximum and Oceanic Anoxic Events in the Mesozoic. The goal of the session is to bring together researchers from geological, geophysical, and biological disciplines to improve our knowledge of the cause-effect scenario of these major environmental changes.
GD2.2 Geochemical and geodynamic perspectives on the origin and evolution of deep-seated mantle melts and their interaction with the lithosphere
Convenors: Igor Ashchepkov (igor.ashchepkov@igm.nsc.ru), Sonja Aulbach (s.aulbach@em.uni-frankfurt.de), Kate Kiseeva (kate.kiseeva@earth.ox.ac.uk), NV Chalapathi Rao (nvcraobhu@gmail.com), Evgenii Sharkov (sharkov@igem.ru)
The origin and evolution of the continental lithosphere is closely linked to changes in mantle dynamics through time, from its formation through melt depletion to multistage reworking and reorganisation related to interaction with melts formed both beneath and within it. Understanding this history is critical to constraining terrestrial dynamics, element cycles and metallogeny. We welcome contributions dealing with: (1) Reconstructions of the structure and composition of the lithospheric mantle, and the influence of plumes and subduction zones on root construction; (2) Interactions of plume- and subduction-derived melts and fluids with the continental lithosphere, and the nature and development of metasomatic agents; (3) Source rocks, formation conditions (P-T-fO2) and evolution of mantle melts originating below or in the mantle lithosphere; (4) Deep source regions, melting processes and phase transformation in mantle plumes and their fluids; (5) Modes of melt migration and ascent, as constrained from numerical modelling and microstructures of natural mantle samples; (6) Role of mantle melts and fluids in the generation of hybrid and acid magmas.These topics can be illuminated using the geochemistry and fabric of mantle xenoliths and orogenic peridotites, mantle-derived melts and experimental simulations.