/* DATA DESCRIPTION: Citation: Thierstein, Hans R; Asaro, Frank; Ehrmann, Werner; Huber, Brian T; Michel, Helen V; Sakai, Hideo; Schmitz, Birger (1991): Stable isotope ratios, iridium concentrations, and mineralogy of sediments at and around the Cretaceous/Tertiary boundary at ODP Hole 119-738C [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.758528, Supplement to: Thierstein, HR et al. (1991): The Cretaceous/Tertiary Boundary at Site 738, southern Kerguelen Plateau. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 849-867, https://doi.org/10.2973/odp.proc.sr.119.157.1991 Abstract: High-resolution stratigraphic evidence of an apparently complete carbonate-rich Cretaceous/Tertiary boundary interval in Section 119-738C-20R-5 from the southern Kerguelen Plateau is summarized and interpreted. The change of the calcareous nannoflora and of the planktonic foraminifers is spread over a laminated interval of about 15 cm thickness. The base of this laminated interval lies in uppermost Maestrichtian chalks, 2 cm below a distinct 2-mm-thick "gray clay" layer, which shows the highest iridium enrichment (18 ppb) measured in this section. No shocked quartz or microspherules, characteristic of an impact, were found. No change in the clay mineralogy, which could be expected for a large volcanic or impact event, could be identified. Elevated metal and iridium concentrations (> 1.6 ppb) occur already in the bioturbated uppermost Maestrichtian chalks several centimeters below the "gray clay" and decrease above the iridium peak gradually over a laminated 12-cm-thick interval to background values of 0.1-0.3 ppb Ir. Application of bio- and magnetochronology shows that the accumulation rates of carbonates and clays, but not of the metals, decreased dramatically at the Cretaceous/Tertiary boundary and thus, the lack of dilution may have led to the observed metal concentrations. Project(s): Ocean Drilling Program (ODP) (URI: https://www-odp.tamu.edu:443/) Coverage: LATITUDE: -62.709000 * LONGITUDE: 82.787800 DATE/TIME START: 1988-01-11T18:45:00 * DATE/TIME END: 1988-01-17T05:00:00 MINIMUM DEPTH, sediment/rock: 376.000 m * MAXIMUM DEPTH, sediment/rock: 389.600 m Event(s): 119-738C * LATITUDE: -62.709000 * LONGITUDE: 82.787800 * DATE/TIME START: 1988-01-11T18:45:00 * DATE/TIME END: 1988-01-17T05:00:00 * ELEVATION: -2263.0 m * PENETRATION: 533.8 m * RECOVERY: 146.03 m * LOCATION: Indian Ocean * CAMPAIGN: Leg119 * BASIS: Joides Resolution (URI: https://www-odp.tamu.edu:443/resolutn.html) * METHOD/DEVICE: Drilling/drill rig (DRILL) * COMMENT: 35 cores; 337.2 m cored; 0 m drilled; 43.3 % recovery Comment: The Cretaceous/Tertiary boundary clay is at Section 119-738C-20R-5, 96.0-96.2 cm. The samples for the nannofossil counts and microcarbonate estimates were taken at specific millimeter intervals. The samples for carbonate, clay mineralogical, and geochemical analyses were homogenized over 1-cm intervals and are listed at the corresponding centimeter levels. Parameter(s): Sample code/label (Sample label) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) * METHOD/DEVICE: DSDP/ODP/IODP sample designation (URI: hdl:10013/epic.27914.d001) DEPTH, sediment/rock [m] (Depth sed) * GEOCODE δ18O, carbonate [‰ PDB] (δ18O carb) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) * COMMENT: fine fraction <38 µm δ13C, carbonate [‰ PDB] (δ13C carb) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) * COMMENT: fine fraction <38 µm Iridium [ng/kg] (Ir) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) Smectite [%] (Sme) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) Illite [%] (Ill) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) Chlorite [%] (Chl) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) Calcium carbonate [%] (CaCO3) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) Microcarbonate [%] (Microcarbonate) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) Nannofossils, tertiary [%] (Nannos tertiary) * PI: Thierstein, Hans R (thierstein@erdw.ethz.ch) License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 260 data points */ Sample label Depth sed [m] δ18O carb [‰ PDB] δ13C carb [‰ PDB] Ir [ng/kg] Sme [%] Ill [%] Chl [%] CaCO3 [%] Microcarbonate [%] Nannos tertiary [%] 119-738C-20R-5,43 376.630 390 90.5 6.1 2.5 83.7 119-738C-20R-5,50 376.700 95 59 119-738C-20R-5,55 376.750 -0.58 1.57 520 92.6 5.4 1.6 82.0 119-738C-20R-5,60 376.800 90 43 119-738C-20R-5,66 376.860 -0.59 1.54 920 92.6 6.3 1.0 81.0 119-738C-20R-5,69 376.890 90 62 119-738C-20R-5,70.5 376.905 95 54 119-738C-20R-5,76 376.960 -0.59 1.80 1030 88.1 7.4 4.4 77.0 119-738C-20R-5,80.2 377.002 90 85 119-738C-20R-5,82 377.020 -0.41 2.22 4240 90.4 8.4 0.8 76.8 95 46 119-738C-20R-5,83.5 377.035 -0.33 2.04 5540 93.7 4.1 1.0 77.2 99 7 119-738C-20R-5,84 377.040 -0.57 2.10 5100 93.2 4.1 1.9 78.5 80 7 119-738C-20R-5,84.1 377.041 90 30 119-738C-20R-5,85 377.050 6020 91.9 6.2 1.0 76.9 90 15 119-738C-20R-5,86.5 377.065 -0.86 1.99 5500 88.0 10.6 0.7 78.5 99 9 119-738C-20R-5,87 377.070 -0.53 2.00 6050 87.0 12.1 0.6 81.7 119-738C-20R-5,88 377.080 -0.52 2.17 5950 94.4 4.8 0.5 81.1 119-738C-20R-5,89.4 377.094 -0.71 2.43 6170 88.8 9.9 0.8 83.0 95 1 119-738C-20R-5,90 377.100 -0.72 2.25 7530 96.0 3.1 0.5 83.5 119-738C-20R-5,91 377.110 -0.53 2.40 8050 94.2 4.9 0.6 83.0 80 1 119-738C-20R-5,92 377.120 -0.56 2.53 9330 97.5 1.9 0.2 81.9 90 2 119-738C-20R-5,92.3 377.123 80 2 119-738C-20R-5,93 377.130 -0.79 2.44 9670 97.3 2.0 0.5 80.1 119-738C-20R-5,94.2 377.142 -0.63 2.50 10450 96.2 3.2 0.3 78.7 50 0 119-738C-20R-5,95.3 377.153 70 0 119-738C-20R-5,95.7 377.157 -0.62 2.43 13540 94.7 3.4 1.1 68.6 80 0 119-738C-20R-5,95.9 377.159 90 2 119-738C-20R-5,96.1 377.161 17760 91.0 8.2 0.3 69.0 50 2 119-738C-20R-5,96.4 377.164 -0.41 2.25 7710 91.0 6.8 1.9 90.7 90 0 119-738C-20R-5,97.5 377.175 -0.52 2.27 2540 88.2 7.5 3.8 96.0 119-738C-20R-5,98 377.180 -0.70 2.09 2130 88.5 6.5 3.3 96.3 0 119-738C-20R-5,99 377.190 -0.88 1.90 1790 93.7 4.5 1.1 96.9 119-738C-20R-5,99.8 377.198 70 0 119-738C-20R-5,100.3 377.203 -0.45 2.16 1640 88.1 8.6 2.9 97.0 119-738C-20R-5,101 377.210 -0.39 2.17 1650 88.5 8.3 3.0 97.2 90 0 119-738C-20R-4,130 376.000 -0.44 1.67 119-738C-20R-CC 379.900 -0.38 2.18 119-738C-21R-CC 389.600 -0.46 2.13