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

Geology

By:
, , , , , , and
DOI: 10.1130/G19974.1

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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.

Additional Publication Details

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
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
69
Last page:
72