Earth Surface Dynamics
Earth Surface Dynamics
ESurf
Articles | Volume 11, issue 1
Articles | Volume 11, issue 1
https://doi.org/10.5194/esurf-11-51-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esurf-11-51-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 11, issue 1
Research article
 | 
31 Jan 2023
Research article |  | 31 Jan 2023

Mineral surface area in deep weathering profiles reveals the interrelationship of iron oxidation and silicate weathering

Beth A. Fisher, Kyungsoo Yoo, Anthony K. Aufdenkampe, Edward A. Nater, Joshua M. Feinberg, and Jonathan E. Nyquist

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Short summary
We measured the surface area of minerals in two 21 m cores from soil to bedrock to test hypotheses on the formation of the surface area of weathered rock. A sharp increase in high-surface-area secondary minerals extended from 3 m to the ground surface. Half the total surface area was from corroded iron minerals, which form in the presence of oxygen, even though corroded iron comprised less than 0.1 % of the rock. Element removal by rock dissolution started at 7 m but did not form new minerals.
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