Orbital Influences on Geomagnetic field in the Matuyama and the Gauss Chron at IODP site U1314 in the North Atlantic

大野 正夫; 趙 夢

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インターナショナルセッション（ポスター発表）

セッション記号 S (固体地球科学) » S-EM 固体地球電磁気学

[S-EM05] Full vector geomagnetic and paleomagnetic secular variation: direction, intensity and dynamo simulations

2016年5月22日(日) 17:15 〜 18:30 ポスター会場 (国際展示場 6ホール)

コンビーナ:*渋谷秀敏(熊本大学大学院自然科学研究科)、山本裕二(高知大学海洋コア総合研究センター)、Paterson Greig(Institute of Geology and Geophysics Chinese Academy of Sciences)、Brown Maxwell(GFZ German Research Centre for Geosciences)

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17:15 〜 18:30

[SEM05-P03] Orbital Influences on Geomagnetic field in the Matuyama and the Gauss Chron at IODP site U1314 in the North Atlantic

*大野正夫¹、趙夢¹ (1.九州大学大学院比較社会文化研究院)

キーワード：geomagnetic excursion, Milankovitch cycle

We have investigated the detailed geomagnetic field variation during the Matuyama and the Gauss Chron from a sediment core (IODP Site U1314) with high sedimentation rate (≥ 10 cm/kyr) and good age control. Characteristic remanent magnetization directions were well resolved by stepwise alternating field demagnetization. As a proxy of relative paleointensity, natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization (ARM) was used after testing that the influence of magnetic interaction in ARM is negligible. We discuss the variation of the geomagnetic field with the period close to those of the Earth's orbital elements.