Preprints
https://doi.org/10.5194/gchron-2024-18
https://doi.org/10.5194/gchron-2024-18
26 Jun 2024
 | 26 Jun 2024
Status: this preprint is currently under review for the journal GChron.

Cosmogenic 21Ne exposure ages on late Pleistocene moraines in Lassen Volcanic National Park, California, USA

Joseph P. Tulenko, Greg Balco, Michael A. Clynne, and L. J. Patrick Muffler

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.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Joseph P. Tulenko, Greg Balco, Michael A. Clynne, and L. J. Patrick Muffler

Status: open (until 14 Aug 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gchron-2024-18', Benedikt Ritter, 15 Jul 2024 reply
Joseph P. Tulenko, Greg Balco, Michael A. Clynne, and L. J. Patrick Muffler
Joseph P. Tulenko, Greg Balco, Michael A. Clynne, and L. J. Patrick Muffler

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Short summary
Cosmogenic nuclide exposure dating is an exceptional tool for reconstructing glacier histories, but reconstructions based on common target nuclides (e.g., 10Be) can be costly and time consuming to generate. Here, we present a low-cost proof-of-concept 21Ne exposure age chronology from Lassen Volcanic National Park, CA, USA that broadly agrees with nearby 10Be chronologies but at lower precision.