Proc. IODP, 340, Site U1395

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Chapter contents Background and objectives Operations Transit to Site U1395 Site U1395 Lithostratigraphy Unit A Unit B Unit C Unit D Unit E Unit F Unit G Unit H Unit I Paleontology and biostratigraphy Calcareous nannofossils Planktonic foraminifers Benthic foraminifers Geochemistry Physical properties Stratigraphic correlation between Holes U1395A and U1395B Gamma ray attenuation density, magnetic susceptibility, and P-wave velocity Thermal conductivity Shear strength P-wave velocity Moisture and density Downhole temperature Paleomagnetism Results Downhole logging Operations Data processing and quality assessment Logging stratigraphy Formation MicroScanner images References Figures F1. Site U1395 maps. F2. Pumice-rich bed. F3. Biozonation. F4. XRD patterns. F5. Solid-phase geochemical depth profiles. F6. Pore water geochemical depth profiles. F7. Magnetic susceptibility correlation. F8. Physical properties measurements. F9. Temperature as a function of depth. F10. Intensity, inclination, and declination, Hole U1395A. F11. Intensity, inclination, and declination, Hole U1395B. F12. Magnetic susceptibility correlations. F13. Biostratigraphy. F14. Tool string deployments. F15. Triple combo logs. F16. FMS-sonic logs. F17. Log comparison. F18. Spectral NGR measurements. F19. FMS images. Tables T1. Coring summary. T2. Solid-phase geochemistry. T3. Interstitial pore water. T4. Correlation point picks and depth shifts. T5. Paleomagnetism samples. PDF file			Previous \| Next doi:10.2204/iodp.proc.340.105.2013 Site U1395¹ Expedition 340 Scientists² Background and objectives Integrated Ocean Drilling Program (IODP) Site U1395 (proposed Site CARI-04D; 16°29.60′N, 61°57.09′W; 1191 meters below sea level [mbsl]) is located between Guadeloupe and Montserrat (Fig. F1). According to the site survey data, Site U1395 is located beside Deposit 2. Seismic reflection profiles indicated that drilling at Site U1395 could penetrate a succession of hemipelagic sediment and turbidites. The proposed total depth for this site was 244 meters below seafloor (mbsf). The objective for Site U1395 was to characterize the sedimentation processes related to volcanic activity in the Bouillante–Montserrat half graben. We planned to drill through hemipelagic sediment, turbidites, and tephra to retrieve a complete record of sediment. Work around the Canary Islands has shown that distal volcaniclastic turbidites generated by collapse events can be used to study the gross character of landslide emplacement (Wynn and Masson, 2003; Hunt et al., 2011). Results from Ocean Drilling Program (ODP) Hole 1223A off Hawaii identified the association of several turbiditic deposits with landslides, showing that the Koolau Volcano collapsed repeatedly and that landslides constituted a greater risk than previously thought (Garcia et al., 2006). Analysis of cores taken during the JCR123 cruise suggests that distal turbidites associated with Montserrat provide a record of all main pyroclastic flow events that entered the ocean during the current eruptive phase (since 1995). Information from these cores also records the waxing and waning phases of individual dome collapses (Trofimovs et al., 2006). Turbidites in cores recovered from this site should therefore provide a record of dome and flank collapses. With the retrieved material, it will also be possible to better constrain the long-term sedimentation rate in the northern part of the arc. ¹ Expedition 340 Scientists, 2013. Site U1395. In Le Friant, A., Ishizuka, O., Stroncik, N.A., and the Expedition 340 Scientists, Proc. IODP, 340: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.340.105.2013 ² Expedition 340 Scientists’ addresses. Publication: 17 August 2013 MS 340-105 Top of page \| Previous \| Next