2010 Fiscal Year Final Research Report

Establishment of a standard high-resolution Plio-Pleistocene stratigraphy using a detrital marine sequence distributed in the Boso Peninsula, Japan.

Research Project

Project/Area Number	20540453
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Stratigraphy/Paleontology
Research Institution	Ibaraki University
Principal Investigator	OKADA Makoto Ibaraki University, 理学部, 准教授 (00250978)
Project Period (FY)	2008 – 2010
Keywords	層序 / 古地磁気学 / 古海洋学 / 房総半島
Research Abstract	Our research group has reconstructed magnetostratigraphy and oxygen isotopic stratigraphy for the Plio-Pleistocene Chikura Group distributed on the southern Boso Peninsula, Japan. The results indicate that, the studied sequence is comparable from the upper Gauss chronozone including the Kaena sub-chronozone to the lower Matuyama chronozone, and the oxygen isotopic curve is correlated between from MIS G16 through 93, which are derived by the LR04 standard curve. We define 15 tephra layers, named as from Okr1 to Okr15, in which 8 layers are identified as key tephra layers widely distributed in central Japan by means of lithologies, mineral asembrages and chemical compositions of glass shards. The Matuyama/Gauss boundary at this studied sequence is situated on MIS 103, not on MIS 104 that is described in the LR04 time scale.

(5 results)