[S-EM17] Geomagnetism, Paleomagnetism and Rock Magnetism

[SEM17-12] Examination of the properties of remanent magnetization carried by magnetotactic bacteria Magnetospirillum magnetotacticum MS-1

*Kohei Masaoka¹, Yusei Kataoka¹, Yuki Morono², Naotaka Tomioka², Goichiro Uramoto¹, Nana Yoshikane¹, Yuhji Yamamoto¹ (1.Kochi University, 2.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology)

Variation of the past geomagnetic field is recorded in marine sediments as a fossil magnetization, called natural remanent magnetization (NRM). It has begun to be pointed out that NRM of the sediment is carried not only by detrital and aeolian magnetic grains but also by biogenic magnetic grains originated from magnetotactic bacteria. To investigate characters of NRM carried by biogenic magnetic grains, we cultured the microaerobic bacteria Magnetospirillum magnetotacticum MS-1 in laboratory and made samples using them for remanent magnetization measurements by simulating a very early process of sediment formation. We will report properties and characters of the remanent magnetization carried by the samples including simulated NRMs.