1. Fig. 4 Reconciling magnetotelluric observations with the experimental results.
Reconciling magnetotelluric observations with the experimental results. (A) The conductivity structure of the Northern East Pacific Rise. Warm colors show the melting regime under the ridge. Black lines show the nominally anhydrous solidus (dot-dashed) and 200 μg/g H2O solidus (dashed) of previous studies (left side) (11, 12), corresponding to a mantle potential temperature (Tp) of 1350°C. White lines show the 0 μg/g H2O (dot-dashed) and 450 μg/g H2O solidi (dashed) from this study (right side) at the same Tp. Red lines are the 0 μg/g H2O (dot-dashed) and 200μg/g H2O solidi (dashed) from this study, corresponding to a mantle Tp of 1410°C. From (22); reprinted by permission from Macmillan Publishers Ltd., copyright 2013, (B) The solidi and conductivity structure with depth beneath the ridge from (A), and the corresponding 1350° (bold black) and 1410°C (bold dashed black) mantle adiabats. Black lines are the nominally anhydrous (solid) and corresponding 200 μg/g H2O (dashed) solidi from previous studies (11, 12). Red lines are the 0 μg/g H2O (solid), and corresponding 200 (dashed) and 450 μg/g H2O (dot-dashed) solidi based on this study. The kink in the solidi at 2.8 GPa represents the spinel to garnet transition. The adiabat-solidi intersections illustrate depth where melting begins.
Emily Sarafian et al. Science 2017;355:
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