Dear all, We invite you to submit an abstract to Session 02f - *Diamonds, Xenoliths, and their host Magmas: Windows into the Deep Earth*, for the 2026 Goldschmidt Conference in Montreal, Canada (July 12-17th). We are pleased to announce that *Prof. Peng Ni (UCLA) will be the Keynote speaker* for this session. *Invited speakers include Prof. Dorrit Jacob* (Australian National University), *Dr. Qiwei Zhang* (University of Alberta, Canada) and *Dr. Andrea Curtolo* (Bayerisches Geoinstitut, Germany). *Session Description:* Diamonds are resilient, robust and direct probes of the deep Earth that extend to some of the earliest stages of Earth’s planetary evolution. Diamonds host mineral and fluid inclusions that provide crucial insights into the composition and evolution of mantle regions that are otherwise inaccessible. The carbon and nitrogen isotopic compositions of diamond continue to improve our understanding of how volatile cycling has changed throughout Earth’s history. Understanding how nitrogen and hydrogen impurities in diamond are incorporated during diamond formation, and how related defects evolve with time and temperature, is a crucial part of relating isotopic data to the types and sources of deep mantle diamond-forming fluids. Diamond surface textures provide a record of mantle-derived melts and fluids percolating through the lithospheric keels of cratons. The formation of kimberlite, lamproite and lamprophyre magmas, which bring fragments of the sub-cratonic mantle and diamonds to the surface, is defined by multiple competing hypotheses regarding their composition and origin. Recent advancements in analytical, experimental, and thermodynamic and computer modelling methods have significantly expanded our knowledge of mantle processes leading to kimberlite magmatism and the formation of diamond, the inclusions they contain, and enclosing mantle lithologies. *This session invites contributions from different disciplines of diamond research including studies of kimberlite, lamproite and lamprophyre magmatism, studies of kimberlite-borne mantle xenoliths and the processes that control their composition and texture, and studies of defects and inclusions in diamond.* Our session 02f is part of Theme 02: Deep Earth's Chemistry and Dynamics and links to Theme 03: Dynamics and Evolution of the Lithosphere, Theme 04: Magmatism and Volcanism: Impacts and Consequences and Theme 05: Energy, Resources, and the Environment: https://conf.goldschmidt.info/goldschmidt/2026/goldschmidt/2026/meetingapp.cgi/Session/8794 *Abstract submission details and session information can be found here:* https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8794 *The abstract submission deadline is February 26th, 2026.* We welcome abstracts from people of all career stages and research backgrounds. Please feel free to share this invitation with colleagues, collaborators, and students who might be interested in submitting an abstract to our session. If you have any questions please feel free to reach out to any of the session conveners; Yana Fedortchouk (email: yana@dal.ca); Maxwell C. Day (email: maxwell.day@unipd.it); Soumendu Sarkar (email: soumendu@ualberta.ca) or Francesca Innocenzi (email: francesca.innocenzi@unipd.it). We are looking forward to hosting a widely attended, diverse and productive session! [image: image.png] All the best, Session Conveners Maxwell C. Day, Ph.D. Postdoctoral Researcher - Mineralogy/Crystallography Department of Geosciences, University of Padova Via G. Gradenigo, 6, 35131, Padova, Italy Email: maxwell.day@unipd.it