Japan Geoscience Union Meeting 2015

Presentation information


Symbol M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT44] Frontiers in Geochemistry: Prospect for geochemistry in 30 years

Tue. May 26, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Takafumi Hirata(Graduate School of Science, Kyoto University), Yoshio Takahashi(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Urumu Tsunogai(Graduate School of Environmental Studies, Nagoya University), Hajime Obata(Marine inorganic chemistry division, Atmosphere and Ocean Research Institute, University of Tokyo), Shogo Tachibana(Department of Natural History Scieces, Hokkaido University), Katsuhiko Suzuki(Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology), Gen Shimoda(Geological Survey of Japan, AIST), Hiroyuki Kagi(Geochemical Laboratory, Graduate School of Science, University of Tokyo), Yusuke Yokoyama(Atmosphere and Ocean Research Institute, University of Tokyo), Tetsuya Yokoyama(Department of Earth and Planetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology)

6:15 PM - 7:30 PM

[MTT44-P02] Attempt to measure magnetization of single pollen in microgravity condition

*Chiaki UYEDA1, Satoshi OGINO1, Keiji HSAYOSHI1 (1.Graduate School of Science)

Keywords:pollen, fossil, identification, magnetic field gradient, microgravity

Precise analyses performed on microfossil pollen included in the soil have provided quantitative information to reconstruct the paleoclimate. In order to improve the precision of the chronical data, it is necessary to reduce the lower limit of detectable number of pollen included in the sample per unit volume. In analyzing an aggregate sample composed of heterogeneous grains, it is often difficult to conclude by visual observations whether or not the minor grains included in the sample are completely discovered and identified without omission. In such cases, it is desirable to separate the aggregate in to single grains and identify their material prior to various scientific researches. It was proposed that identification of solid grain is possible by comparing the grain's magnetization obtained by field-induced translation, with the compiled data of magnetization [1]. The proposed principle of identification has significance in investigating rare samples, such as primitive meteorites, because the method can analyze the small grains in a simple manner without consuming them.
In order to quantitatively evaluate the practicability of separating the microfossil pollen from the soil mineral grains, it is necessary to the precise value of magnetic susceptibility of pollens. Therefore, M-H curves were measured for two kinds of pollen, namely plum and hinokia cypress using a vibrating sample magnetometer VSM. The measurements were performed by sweeping static field between -0.5 and 0.5 T at room temperature. In addition to the diamagnetic relationship expected for the organic chemical composition of pollen, features that indicate saturated moments Ms were observed in the M-H curves of plum pollen, while no evidence of Ms was observed for hinokia cypress. The Ms values showed linear correlations with sample mass m for the two samples. The above-mentioned results magnetization results chemical analysis.
[1] K. Hisayoshi & C. Uyeda, J. Jpn. Soc. Microgravity Appl., (2012).