Coevolution of Weathering Front and Water Table

Wei Wang, Po Chen, Ken Dueker, Ye Zhang, En jui Lee, Dawei Mu, Ian Keifer, Jianying Jiao

研究成果: Article同行評審

3 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號e2021GL092916
期刊Geophysical Research Letters
48
發行號20
DOIs
出版狀態Published - 2021 10月 28

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 一般地球與行星科學

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