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

William C. Evans, Matthijs C. van Soest, Robert H. Mariner, Shaul Hurwitz, Steven E. Ingebritsen, Charles W. Wicks, Mariek E. Schmidt

Research output: Contribution to journalArticle

29 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)69-72
Number of pages4
JournalGeology
Volume32
Issue number1
DOIs
StatePublished - Jan 1 2004

Keywords

  • Gases
  • Intrusions
  • Oregon
  • Springs
  • Three sisters

ASJC Scopus subject areas

  • Geology

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    Evans, W. C., van Soest, M. C., Mariner, R. H., Hurwitz, S., Ingebritsen, S. E., Wicks, C. W., & Schmidt, M. E. (2004). Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry. Geology, 32(1), 69-72. https://doi.org/10.1130/G19974.1