Proc. IODP, 346, Site U1425

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Chapter contents Background and objectives Operations Transit from Site U1424 Hole U1425A Hole U1425B Hole U1425C Hole U1425D Return to Site U1425 Hole U1425E Transit from Site U1425 to Busan, Korea Lithostratigraphy Unit I Unit II Unit III Summary and discussion Biostratigraphy Calcareous nannofossils Radiolarians Diatoms Planktonic foraminifers Benthic foraminifers Mudline samples Geochemistry Sample summary Carbonate and organic carbon Manganese and iron Sulfate and barium Volatile hydrocarbons Alkalinity, ammonium, and phosphate Bromide Yellowness/Absorbance Calcium, magnesium, and strontium Chlorinity and sodium Potassium Boron and lithium Silica Rhizon commentary Preliminary conclusions Paleomagnetism Paleomagnetic samples and measurements Natural remanent magnetization and magnetic susceptibility Magnetostratigraphy Physical properties Thermal conductivity Moisture and density Magnetic susceptibility Natural gamma radiation Compressional wave velocity Vane shear stress Diffuse reflectance spectroscopy Summary Downhole measurements Logging operations Logging data quality Logging units FMS images In situ temperature and heat flow Stratigraphic correlation and sedimentation rates Construction of CCSF-A scale Construction of CCSF-D scale Estimation of gaps between cores based on core-log comparison Sedimentation rates References Figures F1. Bathymetric map. F2. Primary seismic Line St7 1-2. F3. Lithologic summary, Hole U1425B. F4. Lithologic summary, Hole U1425D. F5. Lithologic summary, Hole U1425E. F6. Hole-to-hole lithostratigraphic correlation. F7. Tephra layer distribution. F8. XRD peak intensity. F9. Subunit IA. F10. Slightly bioturbated gray clay. F11. Dark brown laminated intervals. F12. Heavy bioturbation near top of Subunit IA. F13. Euhedral pyrite crystals. F14. Subunit IB. F15. Subunit IIA. F16. Subunit IIB. F17. Moderate to heavy bioturbation. F18. Dolomite layer and concretion. F19. Slump folds. F20. Biosiliceous material, Unit III. F21. Biogenic silica, Subunit IIIA/IIIB boundary. F22. Opal-A and opal-CT. F23. Subunit IIIA. F24. Large vertical burrow. F25. Finely laminated diatom ooze. F26. Subunit IIIB. F27. Parallel laminations in siliceous claystone. F28. Green glauconite minerals. F29. Calcareous and siliceous microfossil biozonation. F30. Age-depth profile. F31. Siliceous and calcareous microfossil distribution. F32. Calcareous nannofossils. F33. Foraminifer distribution. F34. Planktonic foraminifers. F35. Benthic foraminifers. F36. Calcareous agglutinated foraminifers. F37. Interstitial water sampling plan. F38. Solid-phase contents. F39. Mn and Fe profiles. F40. Mn and Fe profiles, uppermost 9 m. F41. SO₄^2– concentrations. F42. Ba profiles. F43. Headspace CH₄ concentrations. F44. Dissolved alkalinity, NH₄⁺, and PO₄^3– profiles. F45. Dissolved alkalinity, NH₄⁺, and PO₄^3– profiles, shallow depth intervals. F46. Br^– concentrations. F47. Absorbance at 227 and 325 nm wavelength. F48. Ca, Mg, and Sr profiles. F49. Dissolved Ca, Mg, and Sr profiles, upper 20 m. F50. Cl^–, Na, and K profiles. F51. Na and K profiles, upper 20 m. F52. B, Li, and H₄SiO₄ profiles. F53. 20 mT AF demagnetization F54. AF demagnetization results. F55. Physical properties. F56. Discrete bulk density, grain density, porosity, water content, and shear strength. F57. L*, GRA density, and discrete bulk density. F58. Color reflectance. F59. Downhole logs and logging units. F60. NGR logs, FMS images, and logging units. F61. Logging operations summary. F62. Correlation of downhole logs and FMS images. F63. FMS images. F64. Heat flow calculations. F65. Core alignment. F66. Correlation between NGR and HSGR logs. F67. Age model and sedimentation rates. Tables T1. Coring summary. T2. XRD analysis. T3. Visible tephra layers. T4. Diatoms. T5. Microfossil bioevents. T6. Calcareous nannofossils. T7. Radiolarians. T8. Planktonic foraminifers. T9. Benthic foraminifers. T10. CaCO₃, TC, TOC, and TN, squeeze cake samples. T11. CaCO₃, TC, TOC, and TN, sediment samples. T12. Interstitial water chemistry. T13. Absorbance. T14. Headspace gas concentrations. T15. FlexIT data. T16. Core disturbance intervals. T17. Inclination, declination, and intensity data. T18. Polarity boundaries. T19. APCT-3 profiles. T20. Vertical offsets. T21. Splice intervals. T22. Tie points. 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IODP, 346: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.346.101.2015 Tada, R., Murray, R.W., Alvarez Zarikian, C.A., Anderson, W.T., Jr, Bassetti, M.-A., Brace, B.J., Clemens, S.C., Dickens, G.R., Dunlea, A.G., Gallagher, S.J., Giosan, L., da Costa Gurgel, M.H., Henderson, A.C.G., Holbourn, A.E., Ikehara, K., Irino, T., Itaki, T., Karasuda, A., Kinsley, C.W., Kubota, Y., Lee, G.S., Lee, K.E., Lofi, J., Lopes, C.I.C.D., Peterson, L.C., Saavedra-Pellitero, M., Sagawa, T., Singh, R.K., Sugisaki, S., Toucanne, S., Wan, S., Xuan, C., Zheng, H., and Ziegler, M., 2015b. Methods. In Tada, R., Murray, R.W., Alvarez Zarikian, C.A., and the Expedition 346 Scientists, Proc. IODP, 346: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.346.102.2015 Tada, R., Murray, R.W., Alvarez Zarikian, C.A., Anderson, W.T., Jr., Bassetti, M.-A., Brace, B.J., Clemens, S.C., da Costa Gurgel, M.H., Dickens, G.R., Dunlea, A.G., Gallagher, S.J., Giosan, L., Henderson, A.C.G., Holbourn, A.E., Ikehara, K., Irino, T., Itaki, T., Karasuda, A., Kinsley, C.W., Kubota, Y., Lee, G.S., Lee, K.E., Lofi, J., Lopes, C.I.C.D., Peterson, L.C., Saavedra-Pellitero, M., Sagawa, T., Singh, R.K., Sugisaki, S., Toucanne, S., Wan, S., Xuan, C., Zheng, H., and Ziegler, M., 2015c. Site U1422. In Tada, R., Murray, R.W., Alvarez Zarikian, C.A., and the Expedition 346 Scientists, Proc. IODP, 346: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.346.103.2015 Tada, R., Murray, R.W., Alvarez Zarikian, C.A., Anderson, W.T., Jr, Bassetti, M.-A., Brace, B.J., Clemens, S.C., Dickens, G.R., Dunlea, A.G., Gallagher, S.J., Giosan, L., da Costa Gurgel, M.H., Henderson, A.C.G., Holbourn, A.E., Ikehara, K., Irino, T., Itaki, T., Karasuda, A., Kinsley, C.W., Kubota, Y., Lee, G.S., Lee, K.E., Lofi, J., Lopes, C.I.C.D., Peterson, L.C., Saavedra-Pellitero, M., Sagawa, T., Singh, R.K., Sugisaki, S., Toucanne, S., Wan, S., Xuan, C., Zheng, H., and Ziegler, M., 2015d. Site U1423. In Tada, R., Murray, R.W., Alvarez Zarikian, C.A., and the Expedition 346 Scientists, Proc. IODP, 346: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.346.104.2015 Tada, R., Murray, R.W., Alvarez Zarikian, C.A., Anderson, W.T., Jr, Bassetti, M.-A., Brace, B.J., Clemens, S.C., Dickens, G.R., Dunlea, A.G., Gallagher, S.J., Giosan, L., da Costa Gurgel, M.H., Henderson, A.C.G., Holbourn, A.E., Ikehara, K., Irino, T., Itaki, T., Karasuda, A., Kinsley, C.W., Kubota, Y., Lee, G.S., Lee, K.E., Lofi, J., Lopes, C.I.C.D., Peterson, L.C., Saavedra-Pellitero, M., Sagawa, T., Singh, R.K., Sugisaki, S., Toucanne, S., Wan, S., Xuan, C., Zheng, H., and Ziegler, M., 2015e. Site U1424. In Tada, R., Murray, R.W., Alvarez Zarikian, C.A., and the Expedition 346 Scientists, Proc. IODP, 346: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.346.105.2015 von Breymann, M.T., Brumsack, H., and Emeis, K.C., 1992. Depositional and diagenetic behavior of barium in the Japan Sea. 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