Japan Geoscience Union Meeting 2014

Presentation information

Poster

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS30_28PO1] Paleoclimatology and paleoceanography

Mon. Apr 28, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Yamada Kazuyoshi(School of Human Sciences, Waseda University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Tomohisa Irino Tomohisa(Faculty of Environmental Earth Science, Hokkaido University), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Kobe University Research Center For Inland Seas), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Masakazu Yoshimori(Atmosphere and Ocean Research Institute, University of Tokyo)

6:15 PM - 7:30 PM

[MIS30-P04] A chronostratigraphic study of the upper Anno formation, in the Awa group

*Yuuki HANEDA1 (1.Ibaraki Unioversity)

Keywords:paleomagnetic stratigraphy, oxygen isotopic stratigraphy, chronostratigraphy

We took oriented mini-core samples for paleomagnetic and rockmagentic measurements at 79 sites and rock samples to extract fossil folaminifera from at sites from the upper Anno formation distributed along the Shikoma river. We carried out rock magnetic, paleomagnetic, oxygen isotopic and carbon isotopic measurements. Magnetic carrier was interpreted as pused-single domain magnetites based on the results of hysteresis and thermal demagnetization, thermomagnetic analyses. We carried out analysis of principal component to results from the thermal demagnetization and extracted Characteristic Remanent Magentizations (ChRMs). In the result, a relatively short reversed polarity zone found in the previous study is defined as the Mammoth subchronozone. We obtained an oxygen isotopic curve from the result of isotopic measurements which is correlatable with the LR04 oxygen isotopic standard curve (Lisiecki & Raymo, 2005). Then we detected 6 tie points to establish an age model for this sequence