Proc. IODP, 344, Upper slope Site U1413

Upper slope Site U1413¹

R.N. Harris, A. Sakaguchi, K. Petronotis, A.T. Baxter, R. Berg, A. Burkett, D. Charpentier, J. Choi, P. Diz Ferreiro, M. Hamahashi, Y. Hashimoto, K. Heydolph, L. Jovane, M. Kastner, W. Kurz, S.O. Kutterolf, Y. Li, A. Malinverno, K.M. Martin, C. Millan, D.B. Nascimento, S. Saito, M.I. Sandoval Gutierrez, E.J. Screaton, C.E. Smith-Duque, E.A. Solomon, S.M. Straub, W. Tanikawa, M.E. Torres, H. Uchimura, P. Vannucchi, Y. Yamamoto, Q. Yan, and X. Zhao²

Background and objectives

Integrated Ocean Drilling Program (IODP) Site U1413 (proposed Site CRIS-13B) targeted the upper slope of the Costa Rica margin, 30 km from the trench. This site is within the 3-D seismic data set along Line 2466 and crossing Line 4882 (Figs. F1, F2). Interplate earthquake relocations and interpretation of geodetic measurements show that this site is located above the seismogenic zone (S.L. Bilek, pers. comm., 2003; LaFemina et al., 2009).

The margin consists of slope sediment with a minimum thickness >1425 m. The primary purpose of drilling Site U1413 was to determine the nature, composition, and physical properties of the slope sediments. This site is also designed as a “pilot hole” in preparation for a proposed deeper CRISP Program B drilling. The location of this site represents a trade-off between being in the >500 m of water depth necessary for D/V Chikyu riser drilling and being over the seaward edge of the seismogenic zone so that drilling depths are a minimum. Additionally, it was important to locate the site within the 3-D seismic data volume.

In preparation for riser operations, engineering objectives included obtaining (1) shallow formation strength data for top hole design, (2) shear strength data to 100 meters below seafloor (mbsf), and (3) material for onshore geotechnical analysis.

Science objectives at Site U1413 included (1) documenting lithology and physical properties, (2) determining the stress orientation of the margin above the seismogenic zone, and (3) estimating the fluid-flow regime and role of slope sediment in fluid flow. Documenting periods of subsidence and uplift provides important information about the process of tectonic erosion that characterizes the Costa Rica margin. Stratigraphic correlation of multiple sites allows for estimating the relative motion of the margin.

¹ Harris, R.N., Sakaguchi, A., Petronotis, K., Baxter, A.T., Berg, R., Burkett, A., Charpentier, D., Choi, J., Diz Ferreiro, P., Hamahashi, M., Hashimoto, Y., Heydolph, K., Jovane, L., Kastner, M., Kurz, W., Kutterolf, S.O., Li, Y., Malinverno, A., Martin, K.M., Millan, C., Nascimento, D.B., Saito, S., Sandoval Gutierrez, M.I., Screaton, E.J., Smith-Duque, C.E., Solomon, E.A., Straub, S.M., Tanikawa, W., Torres, M.E., Uchimura, H., Vannucchi, P., Yamamoto, Y., Yan, Q., and Zhao, X., 2013. Upper slope Site U1413. In Harris, R.N., Sakaguchi, A., Petronotis, K., and the Expedition 344 Scientists, Proc. IODP, 344: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.344.107.2013

Publication: 11 December 2013
MS 344-107

IODP Proceedings Volume contents Search


Expedition reports Research results Supplementary material Drilling maps Expedition bibliography
Chapter contents Background and objectives Operations Transit to Site U1413 Hole U1413A Hole U1413B Hole U1413C Lithostratigraphy and petrology Description of units X-ray diffraction analyses Depositional environment and correlation to Sites U1379 and U1378 (Expedition 334) Paleontology and biostratigraphy Calcareous nannofossils Radiolarians Benthic foraminifers Structural geology Geochemistry Inorganic geochemistry Organic geochemistry Physical properties Density and porosity Magnetic susceptibility Natural gamma radiation P-wave velocity Thermal conductivity Downhole temperature and heat flow Sediment strength Color spectrophotometry Electrical conductivity and formation factor Paleomagnetism Natural remanent magnetization of cores Paleomagnetic demagnetization results Magnetostratigraphy Downhole logging Logging operations Downhole log data quality Log characterization and logging units Borehole images and breakouts References Figures F1. In-line 2466. F2. Location of Expedition 344 drill sites. F3. Lithostratigraphic summary of Site U1413. F4. Unit I. F5. Sliding/slumping event in upper Unit I. F6. Sliding/slumping event in lower Unit I. F7. Tephra layer. F8. Unit III. F9. Sandstone to conglomerate horizon. F10. Laminated sandstone sequence. F11. Glauconite grains. F12. XRD patterns. F13. Benthic foraminifer assemblages. F14. Bedding dip angles, dip angles of faults, and fractures. F15. Bedding data. F16. High-angle reverse fault. F17. Fault kinematics. F18. Salinity, chloride, potassium and sodium. F19. Sulfate, methane, and alkalinity. F20. Alkalinity, sulfate, ammonium, calcium, and magnesium. F21. Strontium, lithium, manganese, boron, silica, and barium. F22. Hydrocarbons and C₁/C₂₊ ratios in headspace gas. F23. Hydrocarbons, CO₂, and C₁/C₂₊ ratios in void gas. F24. TC, IC, TOC, CaCO₃, TN, and C/N ratio. F25. GRA density. F26. Discrete samples. F27. Magnetic susceptibility. F28. NGR profiles. F29. P-wave velocity. F30. Thermal data. F31. Strength data. F32. Reflectance L, a, and b* profiles. F33. Formation factor. F34. Paleomagnetic measurements, Hole U1413A. F35. Paleomagnetic measurements, Hole U1413B. F36. Paleomagnetic measurements, Hole U1413C. F37. Pass-through section measurements. F38. Discrete sample measurements. F39. Magnetic observations. F40. Wireline tool strings. F41. Caliper and total gamma ray logs. F42. Wireline log data. F43. Log images. Tables T1. Coring summary. T2. Lithologic units. T3. Calcareous nannofossils. T4. Radiolarians. T5. Benthic foraminifers. T6. Uncorrected major element concentrations. T7. Sulfate-corrected major element concentrations. T8. Uncorrected minor element concentrations. T9. Corrected minor element concentrations. T10. Hydrocarbon gases. T11. Hydrocarbon and CO₂ gases. T12. TC, IC, TOC, CaCO₃, TN, and C/N ratios. PDF file			Previous \| Next doi:10.2204/iodp.proc.344.107.2013 Upper slope Site U1413¹ R.N. Harris, A. Sakaguchi, K. Petronotis, A.T. Baxter, R. Berg, A. Burkett, D. Charpentier, J. Choi, P. Diz Ferreiro, M. Hamahashi, Y. Hashimoto, K. Heydolph, L. Jovane, M. Kastner, W. Kurz, S.O. Kutterolf, Y. Li, A. Malinverno, K.M. Martin, C. Millan, D.B. Nascimento, S. Saito, M.I. Sandoval Gutierrez, E.J. Screaton, C.E. Smith-Duque, E.A. Solomon, S.M. Straub, W. Tanikawa, M.E. Torres, H. Uchimura, P. Vannucchi, Y. Yamamoto, Q. Yan, and X. Zhao² Background and objectives Integrated Ocean Drilling Program (IODP) Site U1413 (proposed Site CRIS-13B) targeted the upper slope of the Costa Rica margin, 30 km from the trench. This site is within the 3-D seismic data set along Line 2466 and crossing Line 4882 (Figs. F1, F2). Interplate earthquake relocations and interpretation of geodetic measurements show that this site is located above the seismogenic zone (S.L. Bilek, pers. comm., 2003; LaFemina et al., 2009). The margin consists of slope sediment with a minimum thickness >1425 m. The primary purpose of drilling Site U1413 was to determine the nature, composition, and physical properties of the slope sediments. This site is also designed as a “pilot hole” in preparation for a proposed deeper CRISP Program B drilling. The location of this site represents a trade-off between being in the >500 m of water depth necessary for D/V Chikyu riser drilling and being over the seaward edge of the seismogenic zone so that drilling depths are a minimum. Additionally, it was important to locate the site within the 3-D seismic data volume. In preparation for riser operations, engineering objectives included obtaining (1) shallow formation strength data for top hole design, (2) shear strength data to 100 meters below seafloor (mbsf), and (3) material for onshore geotechnical analysis. Science objectives at Site U1413 included (1) documenting lithology and physical properties, (2) determining the stress orientation of the margin above the seismogenic zone, and (3) estimating the fluid-flow regime and role of slope sediment in fluid flow. Documenting periods of subsidence and uplift provides important information about the process of tectonic erosion that characterizes the Costa Rica margin. Stratigraphic correlation of multiple sites allows for estimating the relative motion of the margin. ¹ Harris, R.N., Sakaguchi, A., Petronotis, K., Baxter, A.T., Berg, R., Burkett, A., Charpentier, D., Choi, J., Diz Ferreiro, P., Hamahashi, M., Hashimoto, Y., Heydolph, K., Jovane, L., Kastner, M., Kurz, W., Kutterolf, S.O., Li, Y., Malinverno, A., Martin, K.M., Millan, C., Nascimento, D.B., Saito, S., Sandoval Gutierrez, M.I., Screaton, E.J., Smith-Duque, C.E., Solomon, E.A., Straub, S.M., Tanikawa, W., Torres, M.E., Uchimura, H., Vannucchi, P., Yamamoto, Y., Yan, Q., and Zhao, X., 2013. Upper slope Site U1413. In Harris, R.N., Sakaguchi, A., Petronotis, K., and the Expedition 344 Scientists, Proc. IODP, 344: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.344.107.2013 ² Expedition 344 Scientists’ addresses. Publication: 11 December 2013 MS 344-107 Top of page \| Previous \| Next

Upper slope Site U14131

Background and objectives

Upper slope Site U1413¹