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Title Transcription
ドウイツ ガンタイ ノ スウカショ デ カンソク サレタ シゼン ザンリュウ ジキ ノ シンライセイ
Title Alternative (English)
The Reliability of Natural Remanent Magnetization observed at Several Sites in a Rock Unit
File
language
eng
Author
Ito, Haruaki
Description
Results of palaeomagnetic observations are discussed on the assumption that rocks were magnetized along the direction of the geomagnetic field at the time of formation. It is a matter of great importance that the natural remanent magnetization (NRM) of rocks has stably been preserved against the later change of the geomagnetic field or other physico-chemical influences. Stability of the NRM is examined either by field or laboratory tests (Graham, 1949 ; Nagata, 1961 ; Irving, 1964). However, although the NRM of a rock unit is shown to be stable, it is often unknown whether the direction of the NRM is a primary one of the rock unit or not. For example, the directions of magnetization obtained from rocks of the same time or a single rock mass must closely coincide with one another, but inconsistent examples are rarely observed in such rocks. The inconsistent example suggests that the direction of the stable magnetization of samples collected at a site in a single mass is not always representative of the primary magnetization of the rock unit. Especially, the Japanese Islands are in a zone of active tectonic movement in the Tertiary or Quaternary, and it is of a great importance to confirm that a rock mass has not been deformed by such tectonic movement, and to find out the direction of the original NRM.
Journal Title
島根大学論集. 自然科学
Volume
15
Start Page
26
End Page
32
ISSN
04886542
Published Date
1965-12-25
NCID
AN0010814X
Publisher
島根大学
Publisher Aalternative
Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Faculty of Science and Engineering
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