Paleomagnetic Study of Recent Cascade Lavas, Three Sisters, Oregon
JOURNAL OF GEOPHYSICAL RESEARCH（1973）
摘要
The natural remanent magnetization of 94 oriented cores from nine recent lava flows was measured. The field area is located in the Three Sisters area of the Oregon Cascades. The maximum possible age range for the flows is from 300 to 12,000 years B.P.; eight of the nine flows are younger than 3850 years. The mean direction of magnetization (D _-- 2.2 ø, I . -{-49.6 ø, a -- 5.2 ø) is statistically distinct from the axial geomagnetic dipole field (D 0 ø, I = -62.9ø). It is not clear whether this mean direction is a significant, departure of the main geomagnetic field from an axial direction or part of the 'normal' secular change.
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关键词
the mean direction found here diverges from an axial dipole direction. the magnetic inclination of each individual flow mean direction of mag- netization is consistently too shallow,are coincident with those of an axial dipole,the dec- linations center around geographic north,eight of the nine individual flow mean directions are statistically distinct from both the present geomagnetic field direction and a geocentric axial dipole field,how- ever. after demagnetization,natural remanent magnetization,geomagnetic field
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