日本地球惑星科学連合2018年大会

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[JJ] ポスター発表

セッション記号 H (地球人間圏科学) » H-QR 第四紀学

[H-QR04] 第四紀:ヒトと環境系の時系列ダイナミクス

2018年5月20日(日) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:小荒井 衛(茨城大学理学部理学科地球環境科学コース)、須貝 俊彦(東京大学大学院新領域創成科学研究科自然環境学専攻)、水野 清秀(国立研究開発法人産業技術総合研究所地質情報研究部門、共同)、米田 穣(東京大学総合研究博物館)

[HQR04-P02] Magnetostratigraphic chronology of Borehole HLL01, south coast of Laizhou Bay.

*xingyu Jiang1,2,3 (1.Asian marginal seas have played an important role in modulating regional energy and material exchanges and in deriving climatic and environmental evolutions. 、2.As an effective method, magnetostratigraphy establishes reliable geochronological framework, which is critical for reconstructing long-term history of climatic and environmental changes in the past. 、3.Due to that the previous long-term records were mainly located in the west and north Bohai Sea, thus a new Borehole HLL01, drilled in the Laizhou Bay with a length 450 m, was studied. )

キーワード:Laizhou Bay; magnetostratigraphy; sediment; Pliocene; Pleistocene

Asian marginal seas have played an important role in modulating regional energy and material exchanges and in deriving climatic and environmental evolutions. As an effective method, magnetostratigraphy establishes reliable geochronological framework, which is critical for reconstructing long-term history of climatic and environmental changes in the past. Due to that the previous long-term records were mainly located in the west and north Bohai Sea, thus a new Borehole HLL01, drilled in the Laizhou Bay with a length 450 m, was studied. The main results are as follows: (1) The HLL01 magnetostratigraphy, containing 272 samples with reliable ChRMs and 10 normal and 9 reverse magnetozones, were identified. (2) Comparing with the ATNTS2012, the HLL01 magnetostratigraphy recorded C3An.2n to C1nchrons, and its bottom age was about 6.6 Ma. (3) Boundaries between the Miocene and Pliocene and between the Pliocene and Pleistocene were located at 340 m and 140 m depth, respectively. (4) Through comparison with the previous results from the west and north Bohai Sea, it is inferred that the period since the late Miocene around the Bohai Basin was predominated by thermal subsidence, but their environmental history in various subunits were different.