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Age of the youngest volcanism at Eagle Lake, northeastern California—40Ar/39Ar and paleomagnetic results

Open-File Report 2017-1027

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https://doi.org/10.3133/ofr20171027

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Abstract

The age of the youngest volcanism at Eagle Lake, California, was investigated using stratigraphic, paleomagnetic, and 40Ar/39Ar techniques. The three youngest volcanic lava flows at Eagle Lake yielded ages of 130.0±5.1, 127.5±3.2 and 123.6±18.7 ka, and are statistically indistinguishable. Paleomagnetic results demonstrate that two of the lava flows are very closely spaced in time, whereas the third is different by centuries to at most a few millennia. These results indicate that the basalt lava flows at Eagle Lake are not Holocene in age, and were erupted during an episode of volcanism at about 130–125 ka that is unlikely to have spanned more than a few thousand years. Thus, the short-term potential for subsequent volcanism at Eagle Lake is considered low. 

Suggested Citation

Clynne, M.A., Calvert, A.T., Champion, D.E., Muffler, L.J.P., Sawlan, M.G., and Downs, D.T., 2017, Age of the youngest volcanism at Eagle Lake, northeastern California—40Ar/39Ar and paleomagnetic results: U.S. Geological Survey Open-File Report 2017–1027, 24 p., https://doi.org/10.3133/ofr20171027.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

Abstract
Introduction
General Geology of the Eagle Lake Area
Previous Map Depiction of the Young Basalts at Eagle Lake
Unit Descriptions
Paleomagnetic Secular Variation
40Ar/39Ar Results
Discussion
Conclusions
Acknowledgments
References
Appendix 1. 40Ar/39Ar Analytical Techniques
Appendix 2. Tabulated 40Ar/39Ar data for basaltic flows of Eagle Lake

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Age of the youngest volcanism at Eagle Lake, northeastern California—40Ar/39Ar and paleomagnetic results
Series title:
Open-File Report
Series number:
2017-1027
DOI:
10.3133/ofr20171027
Year Published:
2017
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Volcano Science Center
Description:
iii, 24 p.
Country:
United States
State:
California
Other Geospatial:
Eagle Lake
Online Only (Y/N):
Y