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

Evans, W. C.; van, Soest, M. C.; Mariner, R. H.; Hurwitz, S.; Ingebritsen, S. E.; Wicks, Jr. , C. W.; Schmidt, M. E.

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.

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Article

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70027726

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Evans, W. C.; van, Soest, M. C.; Mariner, R. H.; Hurwitz, S.; Ingebritsen, S. E.; Wicks, Jr. , C. W.; Schmidt, M. E.

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English

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Geology

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Magmatic intrusion west of Three Sisters, central Oregon, USA: The perspective from spring geochemistry; 2004; Article; Journal; Geology; Evans, W. C.; van, Soest, M. C.; Mariner, R. H.; Hurwitz, S.; Ingebritsen, S. E.; Wicks, Jr. , C. W.; Schmidt, M. E.