Abstract
A FUNDAMENTAL assumption in modelling seamount magnetic anomalies is that the contribution of induced magnetization is negligible. The general consistency of seamount and non-seamount palaeopoles, scarcity of poles skewed toward the present field direction and the high ratio of remanent to induced magnetization (Koenigsberger ratio) of many oceanic basalts have been cited as evidence supporting this assumption1,2. Recent discussions concerning the dominance of normally magnetized seamounts have focused attention on the possible role of viscous and induced magnetization in seamount anomalies3–6. Here we determine natural remanent magnetization, initial volume susceptibility and the Koenigsberger ratio for more than 2,000 samples from a subaerially exposed seamount section on La Palma, Canary Islands (Table 1). By contrast to results from the oceanic crust and ophiolites, these data indicate that a variety of rock types are potential magnetic sources. The significant induced component of intrusives underscores the importance of the lithological distribution in determining the character of seamount magnetic anomalies. The La Palma data, together with a plausible lithological distribution, indicate that induced magnetization may account for one-sixth of seamount magnetization.
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Gee, J., Staudigel, H. & Tauxe, L. Contribution of induced magnetization to magnetization of seamounts. Nature 342, 170–173 (1989). https://doi.org/10.1038/342170a0
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DOI: https://doi.org/10.1038/342170a0
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