HR: 0800h
AN: GP11D-0858    [Abstracts]
TI: First Paleo- and Rock Magnetic Results From Erlongwan Maar Lake, Long Gang Volcanic Field, NE China
AU: * Frank, U
EM: ufrank@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, D-14473 Germany
AB: Two 23 m long sediment cores were recovered from the Erlongwan maar lake in 2001. The crater is sitting within Archean migmatites and the mostly minerogenic sediments are finely laminated. Graded layers with thickness from 5 mm up to 1.5 m are intercalated into the sedimentary sequence especially in the uppermost 6 m and below 17 m depth. Both cores were continuously subsampled and all samples were subjected to detailed paleo- and rock magnetic investigations. The inclination and declination records are similar in both cores indicating that the sediments recorded the paleosecular variations of the Earth magnetic field. Based on this assumption a provisional chronology for the profile was created, using published PSV records from the region. The profile probably covers the last 30 kyr. A statistical analysis of the rock magnetic results confirmed the division into lithozones based on a visually inspection of the cores. High temperature runs of saturation magnetizations revealed that magnetite is the dominant magnetic carrier mineral. Further investigations of the sediments will include geochemical and sedimentological analysis in order to reveal additional information about the magnetic recording behaviour of the sediments as well as the influence of post-depositional processes.
DE: 1500 GEOMAGNETISM AND PALEOMAGNETISM
DE: 1522 Paleomagnetic secular variation
DE: 1540 Rock and mineral magnetism
DE: 1599 General or miscellaneous
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2004 AGU Fall Meeting