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Be Age-dating of Marine Sediments from NE Pacific
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 Title & Authors
Be Age-dating of Marine Sediments from NE Pacific
Choi, Hun-Soo; Kong, Gee-Soo; Um, In-Kwon; Kim, Ji-Hoon;
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In order to investigate absolute age of marine sediment in the KR5 region, northeastern Pacific, we measured the Be isotope ( and ) of box core (BC08-02-13) sediment with depth. Core sediment is divided into three sedimentary facies (Facies I, Facies II, FaciesIII). Facies I mainly consists of brown to dark brown (10YR4/3) homogeneous mud with high water content. Facies II shows brownish yellow (10YR6/6) color. The unconformity is recognized at the boundary between Facies I and Facies II, Facies III consists of very dark brown (10YR2/2) mud. Many bioturbated burrows are observed at FaciesII and FaciesIII. Based on Be dating results, FaciesIII and Facies II had been deposited before 3.7 Ma and 2.3 Ma, respectively. After 2.3 Ma, the upper part of Facies II was eroded due to the change of sedimenary environment. Facies I has been deposited since 1.8 Ma. The unconformity located at the boundary between Facies I and Facies II may be driven by the envrionmental change due to the migration of Intertropical Convergence Zone.
Be age-dating;marine sediment;NE Pacific;sediment environment;
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지자기 방향변화 및 베릴륨 동위원소비를 이용한 북동 적도 태평양 주상시료의 층서확립,김원년;형기성;공기수;

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