State shifts in the deep Critical Zone drive landscape evolution in volcanic terrains
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Abstract
Understanding the near-surface environment where atmospheric and solid earth processes interact, often termed the “Critical Zone,” is important for assessing resources and building resilient societies. Here, we examine a volcanic landscape in the Oregon Cascade Range, an understudied Critical Zone setting that is host to major regional water resources, pervasive silicate weathering, and significant geohazards. We leverage a bedrock age chronosequence to show that the volcanic Critical Zone undergoes a structural shift, from depth extents of >1 km to meters, over timescales of ~1 My. We map an active groundwater volume comparable to major continental lakes, stored at the Cascade Range crest. This state shift makes volcanic landscape evolution a unique probe of deep coupling between Earth systems.
Suggested Citation
Karlstrom, L., Klema, N., Grant, G., Finn, C., Sullivan, P.L., Cooley, S., Simpson, A., Fasth, B., Cashman, K., Ferrier, K., Ball, L.B., McKay, D., 2025, State shifts in the deep Critical Zone drive landscape evolution in volcanic terrains: PNAS, v. 122, no. 2, e2415155122, 9 p., https://doi.org/10.1073/pnas.2415155122.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | State shifts in the deep Critical Zone drive landscape evolution in volcanic terrains |
| Series title | PNAS |
| DOI | 10.1073/pnas.2415155122 |
| Volume | 122 |
| Issue | 2 |
| Publication Date | January 13, 2025 |
| Year Published | 2025 |
| Language | English |
| Publisher | National Academy of Sciences |
| Contributing office(s) | Geology, Geophysics, and Geochemistry Science Center |
| Description | e2415155122, 9 p. |