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(2020) Examining Formation and Dissolution of Fe-Rich Incipient Weathering Products Using Field, Laboratory, and Reactive Transport Modeling Approaches

Hausrath E, Feldman A, Luu N, Peretyazhko T, Provow A, Ralston S, Rampe E & Sanchez A


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14g: Plenary Hall, Thursday 25th June 00:45 - 00:48

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Submitted by Mohit Melwani Daswani on Monday 22nd June 20:15
[Thank you for your interesting presentation. We want to prioritize questions from the audience over the questions from the conveners, but if there is time and no other questions, please feel free to address these questions.] 1) In one of the slides about the reaction-transport models, it was mentioned that hematite and oxidized minerals would be more abundant at depth than at the surface. Why is that? If the source of water was from the surface, wouldn't the rock layers at depth remain more reduced? 2) Would the modeled mineralogy results change significantly if the source of water was groundwater and not surface weathering? 3) The model that matches the observations closest is the one with acidic pH and increasing temperature with depth. Does the acidic pH of the fluid have any implications for the atmospheric pCO2 content? Does the pH neutralize and change with depth? Also, if I interpreted the graphs correctly, the temperature increases from 1 C to 75 C in about 15 m. Isn't that a steep temperature gradient? Thank you! Mohit

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