Laschamp excursion at Mono Lake?

Publication Type  Journal Article
Year of Publication  2002
Authors  Kent, D. V.; Hemming, S. R.; Turrin, B. D.
Journal Title  Earth and Planetary Science Letters
Volume  197
Issue  3-4
Pages  151-164
Journal Date  Apr 15
ISBN Number  0012-821X
Accession Number  ISI:000175551700002
Key Words  magnetic field; c-14; argon; ash; sanidine; earths magnetic-field; enhanced be-10 deposition; c-14 calibration curve; last glacial period; project ice core; geomagnetic excursion; north-atlantic; antarctic ice; volcanic ash; nordic seas

The Laschamp Geomagnetic Excursion (ca. 41 ka) and a related increase of cosmogenic nuclides provides a global tie point among sedimentary and ice core records. In the Wilson Creek Formation, Mono Lake, California, the Laschamp Excursion has not been recognized although the so-called Mono Lake excursion was found in the section with an estimated age of about 28 C-14 ka. However, our reevaluation of the age of the Mono Lake excursion at its type locality using new C-14 dates on carbonates and Ar-40/Ar-39 sanidine dates on ash layers yields an estimate of 38-41 ka. This chronology and the absence of a second excursion in the Wilson Creek Formation suggest that the distinct paleomagnetic feature with negative inclinations at Mono Lake is correlative with the Laschamp Excursion. (C) 2002 Elsevier Science B.V. All rights reserved.


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URL  <Go to ISI>://000175551700002
DOI  Pii S0012-821x(02)00474-0