Stack of late quaternary paleomagnetic records from various sites of Lake Baikal (Siberia)

Details Stack of late quaternary paleomagnetic records from various sites of Lake Baikal (Siberia) Stack of late quaternary paleomagnetic records from various sites of Lake Baikal (Siberia)

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....1831d&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #1831

Physics

Scientific paper

In order to date the climatic variations in Central Asia lakes which are important archives for studying at high resolution the continental climatic variability during the Late Quaternary, an age model using paleomagnetism has to be established. We propose for Lake Baikal a mastercurve stacking various relative paleointensity records of the geomagnetic field. This is anchored by punctual OSL and C14 dating. Paleomagnetic records from all over Lake Baikal, rock and paleomagnetic investigations have been performed on cores from new sites on the margins of the northern, central and southern basins of Lake Baikal. On pilot and piston cores with continuous sedimentation, relative paleointensity curves have been correlated, and tuned to different well dated lacustrine and marine relative paleointensity records. A full excursion of the geomagnetic field is documented in a core from the site close to the northern basin. This excursion has been previously shown in a core from Academician Ridge (Oda et al., 2002) as well as in core BDP-93-1 located at the central and southern basins boundary (BDP-93 Baikal Drilling Project Members, 1997). This event has been stratigraphically positioned in the marine oxygen isotope stage 6, at ~ 180-190 ka. This new evidence for a geomagnetic excursion is an additional anchor point for extending at higher confidence level the age model down to 200 ka. BDP-93 Baikal Drilling Project Members, 1997. Preliminary results of the first scientific drilling on Lake Baikal, Buguldeika Site, Southeastern Siberia. Quarternary International, 37: 3-17. Oda, H., Nakamura, K., Ikehara, K., Nakano, T., Nishimura, M., Khlystov O., 2002. Paleomagnetic record from Academician Ridge, Lake Baikal: a reversal excursion at the base of marine oxygen isotope stage 6. Earth and Planetary Science Letters, 202(1): 117-132.

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