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Wang, Wei ; Chen, Po ; Dueker, Ken ; Zhang, Ye ; Lee, En‐jui ; Mu, Dawei ; Keifer, Ian ; Jiao, Jianying ( , Geophysical Research Letters)
Abstract Water is known to play an essential role in initiating and maintaining subsurface weathering reactions. However, the interaction between the weathering front and the water table is unclear and under intense debate. Here, we present a high‐fidelity, 3D image of a variably saturated weathering front beneath a granite terrain in the Laramie Range, Wyoming, constructed using full‐3D ambient‐noise adjoint tomography and calibrated with data from an extensive drilling and hydraulic well testing effort. The imaged weathering front between saprolite and weathered bedrock is overall shallower than the water table under ridge but deeper than water table under valleys. We propose that downward‐advancing weathering front coevolves with water table in a positive cycle that gradually flattens the water table, enhances the rate of groundwater drainage, and exposes underlying bedrock to weathering. As a result, we expect this cycle to become “sluggish” with time as water table gradient decreases.
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Flinchum, Brady A. ; Holbrook, W. Steven ; Grana, Dario ; Parsekian, Andrew D. ; Carr, Bradley J. ; Hayes, Jorden L. ; Jiao, Jianying ( , Hydrological Processes)