The Matuyama-Brunhes Reversal: a Global and Temporal Perspective

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1521 Paleointensity, 1535 Reversals: Process, Timescale, Magnetostratigraphy

Scientific paper

We present new palaeointensity and palaeodirectional results from the Matuyama-Brunhes geomagnetic field reversal. Dated volcanic sequences from four global locations: La Palma, Chile, Iceland and Guadeloupe, are investigated. These sections sample the Matuyama-Brunhes boundary, possible precursors, and fluctuations in the magnetic field prior to the main polarity reversal. Absolute palaeointensity values were determined using the 14 GHz microwave systems at the Geomagnetism Laboratory, University of Liverpool. New directional results (from thermal demagnetisation) and published directional data are combined with new microwave intensity data to define the full vector of the field during the reversal. We compare our data with 1) other published data for the Matuyama-Brunhes reversal and other reversal records that have both intensity and directional data; 2) a simple mathematical reversal model based upon CALS7K.2 (Brown et al., Geophys. J. Int, 168, 541-551, 2007); 3) the iterative Bayesian model of the Matuyama-Brunhes reversal, IMMAB4 (Leonhardt and Fabian, Earth Planet. Sci. Lett., 253, 172-195, 2007).

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