HR: 11:40h
AN: GP52B-02 INVITED    [Abstracts]
TI: Saturation Isothermal Remanent Magnetization (IRMs) Normalization of Natural Remanent Magnetization (NRM): a Simple Observation with Interpretive Value.
AU: * Fuller, M
EM: mfuller@soest.hawaii.edu
AF: HIGP-SOEST, University of Hawaii at Manoa, Honolulu, HI 96822, United States
AB: A fundamental problem in paleomagnetism is the separation of magnetization acquired at the time interest from subsequent remagnetization. IRMs normalization of NRM can be useful because it is well known that igneous rock samples carrying NRM acquired as a Thermal Remanent Magnetization (TRM) in typical geomagnetic field intensities have a normalization, value of approximately 0.02. Strong departures from this value indicates the presence of secondary magnetizations, or anomalous field conditions. The method has also been used as a rough estimator of the intensity of field in which NRM of igneous rocks was acquired. The difficulty of this approach is the necessary demonstration that the magnetization is a TRM. Recently, the method has received some theoretical consideration (Kletetschka et al, 2003) in terms of TRM efficiency and its observed inverse relationship with saturation magnetization. We have been testng these ideas and focusing on the effects of different magnetic mineralogies upon the success, or failure of the normalization technique.
DE: 1521 Paleointensity
DE: 1533 Remagnetization
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting