Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry
Geology
By: William C. Evans, M.C. van Soest, Robert H. Mariner, S. Hurwitz, S. E. Ingebritsen, C.W. Wicks Jr., and M.E. Schmidt
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Abstract
A geochemical investigation of springs near Three Sisters volcanoes was conducted in response to the detection of crustal uplift west of the peaks. Dilute, low-temperature springs near the center of uplift show 3He/4He ratios ≥7RA (RA is the ratio in air), and transport in total ∼16 MW of heat and ∼180 g/s of magmatic carbon (as CO2). These anomalous conditions clearly reflect the influence of magma, but they seemingly predate the onset of the present uplift and derive from a previous event. Episodes of intrusion may thus be more common in this area than the age of eruptive vents would imply.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry |
| Series title | Geology |
| DOI | 10.1130/G19974.1 |
| Volume | 32 |
| Issue | 1 |
| Year Published | 2004 |
| Language | English |
| Publisher | AGU Publications |
| Description | 4 p. |
| First page | 69 |
| Last page | 72 |