Articles | Volume 11, issue 1
https://doi.org/10.5194/esurf-11-51-2023
https://doi.org/10.5194/esurf-11-51-2023
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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Cited articles

Aburto, F. and Southard, R.: Refined Geomorphologic Interpretation of Glacial Deposits using Combined Soil Development Indices and LiDAR Terrain Analysis, Soil Sci. Soc. Am. J., 81, 109–123, https://doi.org/10.2136/sssaj2016.07.0211, 2017. 
Anderson, S. P., Dietrich, W. E., and Brimhall, G. H.: Weathering profiles, mass-balance analysis, and rates of solute loss: Linkages between weathering and erosion in a small, steep catchment, Bull. Geol. Soc. Am., 114, 1143–1158, 2002. 
Bazilevskaya, E., Lebedeva, M., Pavich, M., Rother, G., Parkinson, D. Y., Cole, D., and Brantley, S. L.: Where fast weathering creates thin regolith and slow weathering creates thick regolith, Earth Surf. Proc. Land., 38, 847–858, https://doi.org/10.1002/esp.3369, 2013. 
Bazilevskaya, E., Rother, G., Mildner, D. F. R., Pavich, M., Cole, D., Bhatt, M. P., Jin, L., Steefel, C. I., and Brantley, S. L.: How Oxidation and Dissolution in Diabase and Granite Control Porosity during Weathering, Soil Sci. Soc. Am. J., 79, 55, https://doi.org/10.2136/sssaj2014.04.0135, 2014. 
Blackmer, G. C.: Bedrock geology of the Coatesville quadrangle, Chester County, Pennsylvania, Pennsylvania Geological Survey, 4th ser., 2004. 
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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.