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Phosphorus as a geochemical tracer of petrogenetic processes (co-organized)
Convener: Ioannis Baziotis  | Co-Convener: M.J. Toplis 
 / Fri, 17 Apr, 13:30–16:30

The composition of igneous and metamorphic rocks as well as their constituent minerals provide critical information on the geologic history of the Earth and other planetary bodies, including the durations and rates of chemical and thermal events. There has been widespread interest recently in the use of phosphorus (P) — a moderately incompatible and very slowly diffusing element — to constrain the history of mineral growth and timescales of petrogenetic processes. P-rich mineral phases have been identified in many terrestrial and extraterrestrial rocks. However, the processes influencing the formation of P-rich silicates are varied, including among others, non-equilibrium incorporation, melt composition, temperature, oxygen fugacity, and apatite saturation. Additionally, the presence of phosphorus may be critical during partial melting, with high concentrations of P acting to lower the silica content of primary liquids in diverse contexts relevant to planetary or meteorite parent-body magmatism.
In this session we welcome experimental, natural, and computational studies of terrestrial and extra-terrestrial materials focused on, but not restricted to, kinetics, temperature-time estimates, crystal growth rates, melt effects and partitioning of phosphorus.

Invited talks:
Alexander Sobolev (Talk title: Phosphorus as indicator of magmatic olivine residence time, morphology and growth rate)
Timm John (Talk title: Using apatite as a fluid probe for halogens to decipher fluid-rock interaction )