Magnetic stratigraphy observed in ferromanganese crust |
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| Authors: | Lung S Chan Chau L Chu Teh L Ku |
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| Institution: | Department of Geology and Geophysics, University of California, Berkeley, CA 94720, USA;Department of Geological Sciences, University of Southern California, Los Angeles, CA 90089, USA |
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| Abstract: | Summary. A sample of ferromanganese crust deposit (SCHW-1D) was cut into two sets of 1 mm slices for palaeomagnetic study. Alternating field and thermal demagnetization, and isothermal remanent magnetization analyses were performed on each thin slice. The results reveal the presence of a stable magnetism and both normal and reversed polarity intervals in the specimens. The observed polarity intervals cannot be confidently correlated with the geomagnetic polarity time-scale of the last 10 Myr due to the polarity overlap inherent in the sampling technique. But the results confirm the slow accretion rate of ferromanganese deposit determined by 10Be method and suggest potential use of ferromanganese deposits in palaeomagnetic and tectonic studies. |
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