八が岳火山東北部に分布する火山岩の古地磁気学的研究
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概要
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The writer studied the paleomagnetism of volcanic rocks, distributed in the northeastern part of Yatsugatake Volcanic Chain (Lat. 36°N, Long. 138.5°E) in central Japan. This volcanic chain is situated in the Fossa Magna and has very interesting geological problems. He discovered the reversely magnetized rocks from the lowermost lava flows of the Yatsugatake volcanic deposits, most of which have westward declinations. Virtual geomagnetic north poles obtained from the orientation of rock magnetism are located near the present geographical north pole, and there is no pole which is distributed in the low latitude region. At one locality, the Oishigawa scoria beds are situated between two reversely magnetized flows, with 7 meter intervals, but all of them are normally magnetized. This problem will be solved after stability tests. Lastly paleomagnetic correlation with some Quaternary deposits of other regions are shown by the writer.
- 地学団体研究会の論文
- 1966-01-30