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2005 year, number 4

FIRST PALEOMAGNETIC RESULTS FROM THE BOTTOM SEDIMENTS OF LAKE HЦVSGЦL BASED ON DRILLING DATA

A.Yu. Kazansky, A.P. Fedotov*, G.G. Matasova, A.A. Yuldashev**, G.A. Ziborova*, T.O. Zheleznyakova*, E.G. Vologina**, Ts. Oyuntcimeg***, Ts. Narantsetseg***, D. Tomurkhoo***
Institute of Geology, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
* Limnological Institute, Siberian Branch of the RAS, 3 ul. Ulan-Batorskaya, Irkutsk, 664033, Russia
** Institute of the Earth's Crust, Siberian Branch of the RAS, 128 ul. Lermontova, Irkutsk, 664033, Russia
*** Institute of Geology and Mineral Resources, Academy of Sciences of Mongolia,
POB 118, Ulaan Baatar, 210351, Mongolia
Keywords: Paleomagnetism, lake sediments, HЦvsgЦl Lake
Pages: 446-449

Abstract

First paleomagnetic results for a 53 m core obtained from the HÖvsgÖl lake deposits (Mongolia) in the framework of the Russian-Mongolian joint project are presented. On the basis of measured inclination of natural remanent magnetization (NRM), three distinct polarity zones corresponding to Brunhes and Matuyama Chrons and Jaramillo Subchron have been recognized. Intervals with shallow NRM inclination are interpreted as possible geomagnetic excursions. Using the boundaries of both polarity zones and excursions as time marks, sedimentation rate of lake deposits is calculated. Several layers with different magnetic properties have been distinguished within the core section. The periodic repetitions of layers with different characteristics, probably, reflect variations in magnetic material input to the lake, changes in water salinity, and fluctuations of the lake level.