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• W2046075128 abstract "The percentage of normal and reversed magnetization in land-based paleomagnetic studies of Phanerozoic rocks (0 to − 570 m.y.) have been compiled in order to determine the long-term variation in polarity bias of the geomagnetic field. Where possible the results are compared with the record from marine magnetic anomalies. Only rarely is there an even balance between normal and reversed polarity. During the past 350 m.y. two quiet intervals can be recognized when few reversals occurred, the Cretaceous (KN about − 81 to − 110 m.y.) and Permo-Carboniferous (PCR about − 227 to − 313 m.y.). Less firmly established are two other quiet intervals, one in the Jurassic (JN about − 145 to − 165 m.y.), and one in the Triassic (TRN about − 205 to − 220 m.y.). Between these quiet intervals there are disturbed intervals when reversals were comparatively frequent. From − 680 to − 350 m.y. the paleomagnetic record is inadequate to delineate a succession of quiet and disturbed intervals although one is probably present. Maximum entropy spectral analysis reveals three periodicities, a dominant one at about 300 m.y. and others, less well-defined, at 113 and 57 m.y. The variations in polarity bias are compared with the paleosecular variation, and it is shown that the magnitude of the paleosecular variation is greater in disturbed than in quiet intervals. This indicates that the magnitude of paleosecular variation and polarity bias are governed by variations in the balance between non-dipole and dipole components of the field, and that these variations probably had their origin in processes near the core—mantle interface. The correspondence between the dominant periods of 300 m.y. and plate tectonics is noted and a causal relationship suggested." @default.
• W2046075128 created "2016-06-24" @default.
• W2046075128 creator A5004172603 @default.
• W2046075128 creator A5004541669 @default.
• W2046075128 date "1976-03-01" @default.
• W2046075128 modified "2023-10-16" @default.
• W2046075128 title "Reversals of the geomagnetic field, magnetostratigraphy, and relative magnitude of paleosecular variation in the phanerozoic" @default.
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• W2046075128 doi "https://doi.org/10.1016/0012-8252(76)90053-2" @default.
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