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High-resolution Rock-magnetic Variability in Shallow Marine Sediment: a Sensitive Paleoclimatic Metronome by Kohsaku Arai; Hideo Sakai; Kenji Konishi is a Earth and Planetary Sciences article available to read on EtoBox.

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An outer shelf deposit in central Japan centered on the Olduvai normal polarity event in the reversed Matuyama chron reveals a close correlation of both the magnetic susceptibility and remanent intensity with the sedimentary cyclicities apparent in lithologies and molluscan assemblages. Two sedimentary cycles are characterized by distinctly similar, but double-peaked magnetic cyclicities. The rock-magnetic variability is primarily attributed to the relative abundance of terrigenous magnetic minerals, and the double peak of the variability is characterized by the concentration of finer-grained magnetic minerals. The concentration is suspected to be controlled by both climatic change and shifting proximity of the shoreline as a function of rise and fall of the sea level due to glacio-eustasy. Rock-magnetic study reveals the record of a 21 ka period of orbital precession cycles within the sedimentary cyclicity attributable to a 41 ka period of orbital obliquity forcing.

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Author

Kohsaku Arai; Hideo Sakai; Kenji Konishi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0037-0738)

Published

1997

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)