1-1-1-1-1-1-1-1-1-1-1-1-1-1 From: Romain Tilhac <romain.tilhac@xxxxxxxxx> Dear colleagues, Please consider contributing to this sub-arc mantle session as the deadline for Goldschmidt 2020 in Hawaii is approaching (this Friday). Volcanic studies relevant to lava source compositions in arc context are welcome! 03a: Development and Recycling of Chemical and Isotopic Heterogeneities in the Sub-Arc Mantle: Observations, Models and Experiments Keynote: Sarah Lambart (University of Utah) Conveners: Romain Tilhac (Kanazawa Uni / Macquarie Uni), Carlos J. Garrido (IACT) The sub-arc mantle is the locus of interaction between mantle-derived melts and fluids, and includes a wide range of lithologies that have previously evolved in various oceanic and continental environments. As such, it is a key region for understanding the genesis and differentiation of arc magmas and the evolution of the lithospheric mantle. The sub-arc mantle also provides a favorable combination of magmatic and tectonic processes for the introduction of physical and chemical heterogeneities in the upper mantle. The characterization and quantification of mantle heterogeneities has major implications for our understanding of the source and genesis of mantle-derived magmas, the composition and nature of geochemical reservoirs, and the thermo-chemical evolution of the Earthâ??s mantle. This session proposes to bring together studies of melt-peridotite interaction in exposed mantle peridotites and xenoliths (petrological, geochemical and isotopic) with experimental and geophysical work to explore how sub-arc processes contribute to the development and recycling of mantle heterogeneities. In order to characterize the signature of subduction- and arc-derived lithologies, contributions from numerical models and experimental petrology tackling heterogeneous melt sources, and of related works on the geochemistry of erupted lavas, are also targeted. Tectonic models, studies on the thermal structure of the mantle wedge, phase changes and metasomatic reactions associated with slab dehydration are welcome in order to provide a multi-disciplinary forum on sub-arc mantle processes and their impact on the major geochemical cycles and geodynamic reconstructions. https://goldschmidt.info/2020/program/programViewThemes#session_469_4374 Aloha! 1-1-1-1-1-1-1-1-1-1-1-1-1-1 ------------------------------
