In this study, results of Be isotopic analyses of sediments collected from the three longest cores drilled in Lake Baikal, i.e. BDP-98 (600 m long), BDP-96 (200 m long) and BDP-93 (102 m long), are presented in relation to their lithological variation. The sediment used in the study has a relatively uniform grain size distribution and mineral composition dominated by detrital feldspars and quartz. Biogenic silica is present in all samples, with amounts up to 40 %. The limited variability in textural and mineralogical (± biogenic silica) composition of the sediment resulted in a constrained 10Be concentration distribution that is mainly related to its production and radioactive decay. Normalization of 10Be to 9Be concentrations shows a trend similar to that of the 10Be distribution. The 10Be-based chronology for the BDP-98 and BDP-96 cores provides time spans of about 8 and 5.5 Myr respectively. Estimation of the 10Be flux indicates high values in the Late Miocene, which can be related to relatively low geomagnetic field intensity during that time.
|Number of pages||57|
|Journal||Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen|
|Publication status||Published - Dec 2005|
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