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

Details 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 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

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30l...4h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 12, pp. 4-1, CiteID 1602, DOI 10.1029/2003GL017488

Physics

1

Geochemistry: Geochronology, Geomagnetism And Paleomagnetism: Magnetostratigraphy, Meteorology And Atmospheric Dynamics: Paleoclimatology, Information Related To Geographic Region: Asia

Scientific paper

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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