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At Site U1421, the logged interval was below the BHA at 92 m WMSF and extended to 695 m WMSF. The logged interval, excluding the bottom-hole assembly (BHA), at Site U1420 was 89–288 m wireline log matched depth below seafloor (WMSF) due to borehole instability (see the “Site U1420” chapter ). As a result of concerns about borehole stability during logging, the density tool with its radioactive source was not included in this tool string thus, no in situ density measurements were made at Sites U1420 and U1421.
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At Site U1421, three holes were drilled, with Hole U1421A reaching total penetration of 1432.4 mbsf (driller’s seafloor depth = 729.7 m), and total recovery from all holes at Site U1421 was ~176 m.Īt Sites U1420 and U1421, shipboard scientists deployed a wireline tool string, which included NGR, sonic velocity, and resistivity tools (see the “Site U1420” and “Site U1421” chapters ). Core recovery was hindered at both sites by large clasts that jammed recovery equipment and resulted in 139.91m of recovered core (14%) over the 1020.8 m interval at Site U1420 (see the “Site U1420” chapter ). This process is described in detail in the “Methods” chapter (Jaeger et al., 2014a) and is schematically illustrated in Figure F2. From the working halves, point measurements of compressional wave velocity were taken with the P-wave caliper (PWC) instrument and discrete samples were collected for moisture and density (MAD) measurements, which consisted of bulk density, water content, porosity, and grain density.
#MATLAB 2014A FIGURE PROPERTIES ARCHIVE#
The archive half then passed through the Section Half Multisensor Logger (SHMSL) where reflection spectroscopy, colorimetry, magnetic susceptibility, and laser split-core surface analyses were performed. Natural gamma ray (NGR) measurements were taken before the splitting the cores into working and archive halves. After a period of temperature equilibration, the core was passed through the Whole-Round Multisensor Logger (WRMSL), which recorded GRA bulk density, magnetic susceptibility, and compressional wave velocity (using the P-wave velocity logger ). After the core came on deck, the whole-round core passed through the Special Task Multisensor Logger (STMSL) where gamma ray attenuation (GRA) bulk density and magnetic susceptibility measurements were collected. During drilling, the shipboard science party performed measurements of various physical properties at multiple scales and resolutions. Time-depth relationship, Site U1420.ĭoi:10.2204/iodp.proc.341.204.2017 Methods and materials Physical property dataĮxpedition 341 collected core and logging data on the continental shelf and slope at Sites U1420 and U1421 (Fig. Original WRMSL bulk density and fit, Site U1420.
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Compiled P-wave velocity measurements, Site U1421. Bulk density compilation and fits, Site U1421. P-wave velocity compilation and spline fits. Bulk density compilation and fits, Site U1420. Compiled P-wave velocity measurements, Site U1420. Core handling and physical property analyses. Site U1421 density and velocity compilation.Site U1420 density and velocity compilation.