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Paleomagnetic study of sediments around the Komyoike Volcanic Ash Horizon in Osaka Group, Senpoku Area, Osaka Prefecture, Japan
Author(s) -
Maenaka Kazuaki
Publication year - 1979
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl006i004p00257
Subject(s) - paleomagnetism , geology , volcano , volcanic ash , sedimentary rock , paleontology , magnetostratigraphy , quaternary , group (periodic table) , sequence (biology) , horizon , stratigraphy , pleistocene , fission track dating , volcanic glass , geochemistry , volcanic rock , tectonics , chemistry , physics , organic chemistry , astronomy , biology , genetics
The Osaka Group is typical of the Plio‐Pleistocene Series in Japan. The correlation of paleomagnetic stratigraphy and biostratigraphy gives a clear picture of the Quaternary history of the Group. The Komyoike volcanic ash layer distributed only in the Senpoku area, in the southern part of Osaka Prefecture is shown to have normal polarity at 1.1 million years (fission track age). The remanent magnetizations of more than one hundred oriented samples collected in sequence from the out‐crop sediments intercalated with the Komyoike volcanic ash bed were measured. Paleomagnetic results after magnetic cleaning show that the sedimentary sequence is divided into three distinct zones by changes in the remanent polarity.