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- Title
Cosmogenic <sup>21</sup>Ne exposure ages on late Pleistocene moraines in Lassen Volcanic National Park, California, USA.
- Authors
Tulenko, Joseph P.; Balco, Greg; Clynne, Michael A.; Muffler, L. J. Patrick
- Abstract
We report new cosmogenic 21Ne-in-quartz exposure ages from 18 samples on three distinct moraines deposited in the Lost Creek drainage, approximately 3–7 km down-valley from Lassen Peak in Lassen Volcanic National Park. Although measuring 21Ne in quartz is generally straightforward, accurate 21Ne exposure dating of deposits of late Pleistocene-age is rarely possible due to the significant quantities of non-cosmogenic 21Ne present in most lithologies. Young quartz-bearing volcanic rocks have been observed to be an exception. We take advantage of moraine boulders sourced from the ~28 ka dacite of Lassen Peak to generate a chronology of alpine deglaciation in Lassen Volcanic National Park. Ages from three distinct moraines are in stratigraphic order, ranging ~22–15 ka, and generally agree with other terminal and some recessional moraine ages across the Cascades and Sierra Nevada Range of the western United States. To date, these are among the youngest surfaces ever dated using cosmogenic 21Ne and provide a cost-effective proof-of-concept approach to dating moraines where applicable.
- Subjects
LASSEN Volcanic National Park (Calif.); MORAINES; NATIONAL parks &; reserves; PLEISTOCENE Epoch; VOLCANIC ash, tuff, etc.; GLACIAL landforms; DACITE
- Publication
Geochronology, 2024, p1
- ISSN
2628-3697
- Publication type
Article
- DOI
10.5194/gchron-2024-18