Presentation Information
[PPS07-P12]Experimental Investigation of Martian Mantle Mineral Phase Transitions under High Pressure and High Temperature Conditions
*Dongliang Jiang1, Takashi Yoshino2 (1.Research Center for Earth and Planet Material Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310058, China, 2. Institute for Planetary Materials, Okayama University, Tottori 682-0193, Japan)
Keywords:
Martian mantle,Phase transitions,BML
The internal structure of Mars remains not well understood, and recent seismic evidence suggests potential mantle heterogeneity. High pressure and high temperature experiments are crucial for testing competing thermal compositional models and for interpreting planetary geophysical observations. We conducted experiments at 6~19GPa using molybdenum capsules to simulate Martian mantle conditions. Two distinct starting compositions were investigated: one based on the recent meteorite derived model of Yoshizaki & McDonough (2020), and the other corresponding to the widely used geochemical model of Wanke & Dreibus (1994). Both compositions were equilibrated under IW buffered conditions to replicate Martian oxygen fugacity. Two geotherms were applied: a Homogeneous Mantle geotherm consistent with conventional layered interior models, and a Heterogeneous Mantle geotherm which includes a hot basal molten silicate layer (BML). The resulting phase assemblages may provide key mineralogical constraints for interpreting seismic velocity profiles and for refining models of the Martian interior.