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http://dx.doi.org/10.9727/jmsk.2011.24.3.179

Be Age-dating of Marine Sediments from NE Pacific  

Choi, Hun-Soo (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kong, Gee-Soo (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Um, In-Kwon (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kim, Ji-Hoon (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Journal of the Mineralogical Society of Korea / v.24, no.3, 2011 , pp. 179-188 More about this Journal
Abstract
In order to investigate absolute age of marine sediment in the KR5 region, northeastern Pacific, we measured the Be isotope ($^{10}Be$ and $^{9}Be$) 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.
Keywords
Be age-dating; marine sediment; NE Pacific; sediment environment;
Citations & Related Records
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