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Horiuchi et al. 2003
Horiuchi, K., Matsuzaki, H., Kobayashi, K., Goldberg, E.L. and Shibata, Y. (2003). 10Be record and magnetostratigraphy of a Miocene section from Lake Baikal: Re-examination of the age model and its implication for climatic changes in continental Asia. Geophysical Research Letters 30: doi: 10.1029/2003GL017488. issn: 0094-8276.

We determined the concentration of the cosmogenic radionuclide 10Be in the Miocene section of a sediment core (5--12 My BP) retrieved from Lake Baikal (BDP98-hole2) that had been previously dated by the magneto-stratigraphic (MS) method. Using our new 10Be geochronology we reexamined the MS age-depth assignments and found inconsistencies. We therefore reexamined the MS record and propose a new model which is consistent with the 10Be data, with an age of 8.4 My BP at a depth of 600 meters. Accepting the revised MS ages, we found the profile of the decay-corrected 10Be concentration, which shows ca. 50% decreases of 10Be during the periods 0--2.7 My BP and 5.3--5.8 My BP. We also detected considerable increases of the 10Be flux into sediments before 4.5 My BP.

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Abstract

Keywords
Geochemistry, Geochronology, Geomagnetism and Paleomagnetism, Magnetostratigraphy, Meteorology and Atmospheric Dynamics, Paleoclimatology, Information Related to Geographic Region, Asia
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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