Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry
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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 |
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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 |
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