Annual cycle of magmatic CO2 in a tree-kill soil at Mammoth Mountain, California: Implications for soil acidification
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Abstract
Time-series sensor data reveal significant short-term and seasonal variations of magmatic CO2 in soil over a 12 month period in 1995–1996 at the largest tree-kill site on Mammoth Mountain, central-eastern California. Short-term variations leading to ground-level soil CO2 concentrations hazardous and lethal to humans were triggered by shallow faulting in the absence of increased seismicity or intrusion, consistent with tapping a reservoir of accumulated CO2, rather than direct magma degassing. Hydrologic processes closely modulated seasonal variations in CO2 concentrations, which rose to 65%–100% in soil gas under winter snowpack and plunged more than 25% in just days as the CO2 dissolved in spring snowmelt. The high efflux of CO2 through the tree-kill soils acts as an open-system CO2 buffer causing infiltration of waters with pH values commonly of <4.2, acid loading of up to 7 keqH+ṁha−1ṁyr−1, mobilization of toxic Al3+, and long-term decline of soil fertility.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Annual cycle of magmatic CO2 in a tree-kill soil at Mammoth Mountain, California: Implications for soil acidification |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1998)026<0463:ACOMCI>2.3.CO;2 |
| Volume | 26 |
| Issue | 5 |
| Year Published | 1998 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 4 p. |
| First page | 463 |
| Last page | 466 |
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