Laschamp excursion at Mono Lake
Abstract 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 L...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
| Published: |
2002
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1044.1497 http://www.rci.rutgers.edu/%7Edvk/dvk_REPRINTS/Kent%2B2002b.pdf |
| Summary: | Abstract 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 14 C ka. However, our reevaluation of the age of the Mono Lake excursion at its type locality using new 14 C dates on carbonates and 40 Ar/ 39 Ar 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. ß |
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