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Geology; January 2004; v. 32; no. 1; p. 69-72; DOI: 10.1130/G19974.1
© 2004 Geological Society of America
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Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry

William C. Evans1, Matthijs C. van Soest2, Robert H. Mariner3, Shaul Hurwitz3, Steven E. Ingebritsen3, Charles W. Wicks, Jr.3 and Mariek E. Schmidt4

1 U.S. Geological Survey, Menlo Park, California 94025, USA
2 Isotope Geochemistry Center, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
3 U.S. Geological Survey, Menlo Park, California 94025, USA
4 Department of Geosciences, Oregon State University, Corvallis, Oregon 97370, USA

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.

Key Words: Three Sisters • Oregon • springs • gases • intrusions




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J. A. Walker, S. Templeton, and B. I. Cameron
The chemistry of spring waters and fumarolic gases encircling Santa Maria volcano, Guatemala: Insights into regional hydrothermal activity and implications for volcano monitoring
Geological Society of America Special Papers, January 1, 2006; 412(0): 59 - 83.
[Abstract] [Full Text] [PDF]


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