10Be SIGNATURE IN THE MIOCENE SECTION OF BDP CORES (LAKE BAIKAL): TESTING MAGNETOSTRATIGRAPHIC AGE MODELS
K. Horiuchi, E.L. Goldberg*, H. Matsuzaki**, K.K. Kobayashi**, and Y. Shibata***
Department of Earth and Environmental Sciences, Faculty of Science and Technology, Hirosaki University, Hirosaki, 036-8561, Japan
* Limnological Institute, Siberian Branch of the RAS, 3 ul. Ulan-Batorskaya, Irkutsk, 664033, Russia
** Research Center for Nuclear Science and Technology, the University of Tokyo, 2-11-16 Yayoi, Tokyo, 113-0032, Japan
*** Environmental Chemistry Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-0053, Japan
Keywords: Magnetostratigraphy, cosmogenic 10Be, Miocene, paleoclimate, global change, Lake Baikal
Pages: 386-390
Abstract
The concentrations of cosmogenic radionuclide 10Be in the Miocene section of the BDP-96-1 (100 to 200 m) and BDP-98-2 (200 to 600 m) cores from Lake Baikal were used as independent geochronology to test the previous magnetostratigraphic age models and to time the core base. Only one of three alternative models for the BDP-98 core showed perfect consistency with decay-corrected 10Be concentrations (with a half-life T1/2=1.5 myr). The basal age of the 600 m BDP-98 section was estimated at 8.4 myr.
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