Fig. 1 Thermal diffusion model to quantify water loss during thermal metamorphism at temperatures of 600° to 800°C. Thermal diffusion model to quantify.

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Presentation transcript:

Fig. 1 Thermal diffusion model to quantify water loss during thermal metamorphism at temperatures of 600° to 800°C. Thermal diffusion model to quantify water loss during thermal metamorphism at temperatures of 600° to 800°C. The model is based on the analytical solution to the diffusion equation discussed by Ingrin and Blanchard (22). A sphere 25 km in radius with pyroxene composition was heated to temperatures of 600° and 800°C for a duration of 10 Ma. The water contents in pyroxene grains at distances of 100 m (A), 1 km (B), and 10 km (C) from the top surface of the sphere are plotted against the duration of thermal metamorphism. Dashed lines indicate the measured concentrations of water in two Itokawa grains. Higher temperatures and shallower depths result in larger diffusivity and enhanced loss of water. At a distance of 100 m, heating at 800°C would result in a loss of up to ~213 ppm water. When the distance from the surface is larger than 1 km, water loss is less than 25 ppm. Ziliang Jin, and Maitrayee Bose Sci Adv 2019;5:eaav8106 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).