Preprints
https://doi.org/10.5194/gchron-2021-19
https://doi.org/10.5194/gchron-2021-19
16 Jun 2021
 | 16 Jun 2021
Status: this preprint was under review for the journal GChron. A final paper is not foreseen.

Paleomagnetic secular variation for a 21,000-year sediment sequence from Cascade Lake, north-central Brooks Range, Arctic Alaska

Douglas P. Steen, Joseph S. Stoner, Jason P. Briner, and Darrell S. Kaufman

Abstract. Two > 5-m-long sediment cores from Cascade Lake (68.38° N, 154.60° W), Arctic Alaska, were analyzed to quantify their paleomagnetic properties over the past 21,000 years. Alternating-field demagnetization of the natural remanent magnetization, anhysteretic remanent magnetization, isothermal remanent magnetization, and hysteresis experiments reveal a strong, well-defined characteristic remanent magnetization carried by a low coercivity magnetic component that increases up core. Maximum angular deviation values average < 2°, and average inclination values are within 4° of the geocentric axial dipole prediction. Radiometric ages based on 210Pb and 14C were used to correlate the major inclination features of the resulting paleomagnetic secular variation (PSV) record with those of other regional PSV records, including two geomagnetic field models and the longer series from Burial Lake, located 200 km to the west. Following around 6 ka (cal BP), the ages of PSV fluctuations in Cascade Lake begin to diverge from those of the regional records, reaching a maximum offset of about 2000 years at around 4 ka. Several correlated cryptotephra ages from this section (reported in a companion paper by Davies et al., this volume) support the regional PSV-based chronology and indicate that some of the 14C ages at Cascade Lake are variably too old.

This preprint has been withdrawn.

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.
Douglas P. Steen, Joseph S. Stoner, Jason P. Briner, and Darrell S. Kaufman

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gchron-2021-19', Anonymous Referee #1, 19 Jul 2021
    • AC1: 'Reply on RC1', Darrell Kaufman, 26 Aug 2021
  • RC2: 'Comment on gchron-2021-19', Anonymous Referee #2, 21 Jul 2021
    • AC2: 'Reply on RC2', Darrell Kaufman, 26 Aug 2021

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gchron-2021-19', Anonymous Referee #1, 19 Jul 2021
    • AC1: 'Reply on RC1', Darrell Kaufman, 26 Aug 2021
  • RC2: 'Comment on gchron-2021-19', Anonymous Referee #2, 21 Jul 2021
    • AC2: 'Reply on RC2', Darrell Kaufman, 26 Aug 2021
Douglas P. Steen, Joseph S. Stoner, Jason P. Briner, and Darrell S. Kaufman
Douglas P. Steen, Joseph S. Stoner, Jason P. Briner, and Darrell S. Kaufman

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This preprint has been withdrawn.

Short summary
Paleomagnetic data from Cascade Lake (Brooks Range, Alaska) extend the radiometric-based age model of the sedimentary sequence extending back 21 kyr. Correlated ages based on prominent features in paleomagnetic secular variations (PSV) diverge from the radiometric ages in the upper 1.6 m, by up to about 2000 years at around 4 ka. Four late Holocene cryptotephra in this section support the PSV chronology and suggest the influence of hard water or aged organic material.