6-6-6-6-6-6-6-6-6-6-6-6-6 From: Val Finlayson <vfinlays@xxxxxxx> Dear colleagues, We invite you to submit your recent work to present in the upcoming Goldschmidt2022 session 2f: Insights into the deep and ancient Earth from geochemical studies of terrestrial and extraterrestrial materials. Our session focuses primarily on the use short-lived, traditional radiogenic and non-traditional stable isotopic systems along with other geochemical data that are oriented toward a better understanding of current research themes investigating past and present mantle heterogeneity. We also aim to integrate this discussion with cognate research, particularly in seismology and geodynamics. Note that Goldschmidt2022 is committed to being â??fully hybrid,â?? meaning that your decision to attend remotely or in person will not affect the potential audience of oral presentations. You will find the session description copied below. If you have any questions, please feel free to reach out. Best regards, The Session 2f conveners: Lauren Harrison, Valerie Finlayson, Katherine Bermingham, and Bradley Peters Session 2f description: Foundational events in Earthâ??s accretion and differentiation history can be investigated through geochemical investigations of samples from Earthâ??s deep interior. For example, study of Earthâ??s mantle by analysis of volcanic rocks and xenoliths has the potential to unlock information about its ancient past, including accretion, crust and continent formation, evolution of mantle composition, onset of subduction, and spatiotemporal scales of mixing that led to the deep Earth heterogeneity. Measurement of the mass-independent isotopic compositions of primitive terrestrial samples, as well as nucleosynthetic heterogeneities found in some extraterrestrial materials, provide critical constraints on the initial composition of the Earth. These observations can be tested further with seismic and dynamic studies. This session focuses on the observational insights provided by geochemical and isotopic (including short-lived, traditional radiogenic and non-traditional stable isotopic systems including nucleosynthetic component indicators) in a variety of materials that range from intraplate and oceanic island basalts, mantle xenoliths, lithospheric magmas, and meteorites. Parallel studies providing constraints on these observations from seismology and geodynamics are also welcomed in order to together provide a perspective into the scale, extent, and origins of deep Earth geochemical heterogeneity in the past and present. 6-6-6-6-6-6-6-6-6-6-6-6-6 ------------------------------
