Proc. IODP, 346, Site U1426

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Chapter content Background and objectives Operations Transit from Site U1425 Hole U1426A Hole U1426B Hole U1426C Hole U1426D Lithostratigraphy Unit I Unit II Discussion Biostratigraphy Calcareous nannofossils Radiolarians Diatoms Planktonic foraminifers Benthic foraminifers Ostracods Mudline samples Geochemistry Sample summary Carbonate and organic carbon Manganese and iron Alkalinity, ammonium, and phosphate Volatile hydrocarbons Sulfate, sulfide, and barium Bromide Absorbance/Yellowness 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 In situ temperature and heat flow Stratigraphic correlation and sedimentation rates Age model and sedimentation rates References Figures F1. Bathymetric map. F2. Lithologic summary, Hole U1426A. F3. Lithologic summary, Hole U1426B. F4. Lithologic summary, Hole U1426C. F5. Lithologic summary, Hole U1426D. F6. Hole-to-hole correlation. F7. Vitric tephra layer. F8. Foraminifer-sand layer. F9. Turbidite layer showing normal grading. F10. Tephra layers distribution. F11. Subunit IA. F12. Bioturbated dark–light color banding. F13. Sediment with high nannofossil content. F14. Sediment with high dolomite content. F15. Subunit IB. F16. Unit II. F17. Unit II sediment. F18. XRD peak intensities. F19. Microfossil biozonation. F20. Age-depth profile. F21. Siliceous and calcareous microfossils. F22. Benthic foraminifer distribution. F23. Benthic foraminifers. F24. Ostracods. F25. Calcareous and agglutinated foraminifers. F26. Mudline benthic foraminifers. F27. AOM in marine sediment. F28. Solid-phase geochemistry. F29. Mn and Fe concentrations. F30. Alkalinity, NH₄⁺, and PO₄^3– profiles. F31. Alkalinity and NH₄⁺, interstitial water. F32. Headspace CH₄ concentrations. F33. Sulfur chemistry. F34. Ba concentrations. F35. Br– concentrations. F36. Absorbance. F37. Ca and Mg profiles. F38. Dissolved Ca, Mg, and Sr profiles. F39. Cl^–, Na, and K profiles. F40. B, Li, and Si concentrations. F41. 20 mT AF demagnetization. F42. AF demagnetization results. F43. Physical properties. F44. Discrete bulk density, grain density, porosity, water content, and shear strength. F45. GRA bulk density, discrete bulk density, grain density, NGR, and XRD. F46. MAD data. F47. Color reflectance. F48. Color reflectance comparison. F49. Heat flow. F50. Composited cores and splice. F51. Age model and sedimentation rates. Tables T1. Coring summary. T2. XRD analysis. T3. Visible tephra layers. T4. Microfossil bioevents. T5. Calcareous nannofossils. T6. Radiolarians. T7. Diatoms. T8. Planktonic foraminifers. T9. Benthic foraminifers. T10. CaCO₃, TC, TOC, and TN from squeeze cakes. T11. CaCO₃, TC, TOC, and TN from sediment. T12. Interstitial water chemistry. T13. Headspace gas concentrations. T14. Vacutainer gas concentrations. T15. Absorbance. T16. FlexIT data. T17. Core disturbance intervals. T18. Inclination, declination, and intensity data. T19. Polarity boundary. T20. APCT-3 profiles. T21. Vertical offsets. T22. Splice intervals. T23. CCSF-C depth scale. PDF file			Previous \| Next doi:10.2204/iodp.proc.346.107.2015 References Blum, P., 1997. Physical properties handbook: a guide to the shipboard measurement of physical properties of deep-sea cores. ODP Tech. Note, 26. doi:10.2973/odp.tn.26.1997 Borowski, W.S., Paull, C.K., and Ussler, W., III, 1996. Marine pore-water sulfate profiles indicate in situ methane flux from underlying gas hydrate. Geology, 24(7):655–658. doi:10.1130/0091-7613(1996)024<0655:MPWSPI>2.3.CO;2 Burdige, D.J., 2011. Temperature dependence of organic matter remineralization in deeply-buried marine sediments. Earth Planet. Sci. 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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., 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., 2015d. 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 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., 2015e. Site U1425. 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.346.106.2015 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., 2015f. Site U1427. 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.346.108.2015 Tamura, I., Yamazaki, H., and Mizuno, K., 2008. Characteristics for the recognition of Pliocene and early Pleistocene marker tephras in central Japan. Quat. 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