A Revised Adiabatic Temperature Profile for the Mantle

This study reevaluates the adiabatic temperature profile of Earth's mantle. The global average at 410-km discontinuity is estimated to be 1839 (38) K by comparing globally averaged depths with previously determined phase diagram olivine-wadsleyite transition in system (Mg,Fe)2SiO4 two temperatures. extrapolated shallower and deeper regions using gradient, which from pressure-volume-temperature relations heat capacities major mantle minerals, namely, olivine, wadselyite, ringwoodite, bridgmanite. experimental temperatures pressures original studies used these evaluations are recalculated recently proposed pressure correction on EMF W97Re3-W75Re25 thermocouple. uncertainties evaluated Monte Carlo simulation. found 1646 (35), 1994 (40), 1960 2587 (60) K, respectively, a 50-km depth, just above 660-km discontinuity, below 2,800-km depth. lower current estimation than those given Katsura et al. (2010), https://doi.org/10.1016/j.pepi.2010.07.001. depth slightly higher but generally agrees that melting depleted peridotite.