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

March 22, 2017

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. 

Citation Information

Publication Year 2017
Title Age of the youngest volcanism at Eagle Lake, northeastern California—<sup>40</sup>Ar/<sup>39</sup>Ar and paleomagnetic results
DOI 10.3133/ofr20171027
Authors Michael A. Clynne, Andrew T. Calvert, Duane E. Champion, L.J.P. Muffler, Michael G. Sawlan, Drew T. Downs
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2017-1027
Index ID ofr20171027
Record Source USGS Publications Warehouse
USGS Organization Volcano Science Center