Laschamp excursion at Mono Lake?

被引：71

作者：

Kent, DV

Hemming, SR

Turrin, BD

机构：

[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[2] Rutgers State Univ, Dept Geol Sci, Piscataway, NJ 08854 USA

[3] Columbia Univ, Dept Earth & Environm Sci, Palisades, NY 10964 USA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2002年 / 197卷 / 3-4期

关键词：

magnetic field; C-14; argon; ash; sanidine;

D O I：

10.1016/S0012-821X(02)00474-0

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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 40Ar/39Ar 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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收藏

页码：151 / 164

页数：14

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