EarthRef.org Reference Database (ERR) -- Shibuya et al. 1995

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Shibuya et al. 1995

Shibuya, H., Cassidy, J., Smith, I.E.M. and Itaya, T. (1995). Paleomagnetism of young New Zealand basalts and longitudinal distribution of paleosecular variation. Journal of Geomagnetism and Geoelectricity 47(10): 1,011-1,022. doi: 10.5636/jgg.47.1011.

A paleosecular variation (PSV) study was carried out on monogenic basalt volcanoes of the northern part of North Island, New Zealand. A new method of calculating angular standard deviation (ASD) by fitting a combination of Fisher distributions to the cumulative histogram of VGP data is presented, which avoids the necessity of applying an arbitrary cut-off angle to exclude intermediate magnetic directions. The resultant ASD of 11.5 degrees for northern New Zealand is smaller than that predicted by previous PSV models. Using this new method, recalculation of published data from elsewhere spanning the last 10Ma suggests that the ASD commonly has been over-estimated and that the global distribution of ASD exhibits a significant longitudinal variation. This relatively long-term non-axisymmetric distribution of ASD implies that the core dynamo process may be strongly influenced by the thermal and/or mechanical regime of the solid mantle.

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Keywords
angular standard deviation; Australasia; basalts; igneous rocks;, longitude; New Zealand; North Island; Northland New Zealand;, paleomagnetism; secular variations; volcanic rocks, 17A, General geophysics

Journal
Journal of Geomagnetism and Geoelectricity
http://www.terrapub.co.jp/journals/EPS/JGG/

Publisher
Terra Scientific Publishing Co., Tokyo
5-27-19 Okusawa
Setagaya-ku, Tokyo 158-0083
Japan
+81-3-3781-7500
+81-3-3718-4406
gj@ess.sci.osaka-u.ac.jp