The origin and evolution of life-essential volatile elements in the rocky planets of the inner solar system have long been debated. Several mechanisms, including planetesimal evaporation and the late delivery of undifferentiated chondrite-like materials, are postulated to be responsible for establishing Earth's volatile inventory. The isotopes of some volatile elements such as sulfur can be used as a tool to trace the accretion processes of volatile elements. In this talk, Dr. Wang will introduce our recent work on sulfur isotope fractionation during planetesimal evaporation and core formation. We examine different hypotheses on the origin and evolution of Earth's sulfur and find that volatile evaporation from molten planetesimals should account for Earth's sulfur isotopic signature.
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