de.pangaea.dataset758528 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-05-01T03:42:22Z https://doi.pangaea.de/10.1594/PANGAEA.758528 1991-01-01 publication https://doi.org/10.1594/PANGAEA.758528 Thierstein, Hans R

thierstein@erdw.ethz.ch

author Asaro, Frank author Ehrmann, Werner

ehrmann@rz.uni-leipzig.de

http://www.uni-leipzig.de/~geologie/Mitarbeiter/Ehrmann/ehrmann.htm information author Huber, Brian T

huberb@si.edu

https://orcid.org/0000-0002-0929-3175 information author Michel, Helen V author Sakai, Hideo author Schmitz, Birger author PANGAEA

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https://www.pangaea.de/ information publisher tableDigital Supplement to: Thierstein, Hans R; Asaro, Frank; Ehrmann, Werner; Huber, Brian T; Michel, Helen V; Sakai, Hideo; Schmitz, Birger (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 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. completed Thierstein, Hans R

thierstein@erdw.ethz.ch

principalInvestigator ODP Ocean Drilling Program theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 82.7878 82.7878 -62.709 -62.709 1988-01-11T18:45:00 1988-01-17T05:00:00 376.0 389.6 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. Sample code/label thematicClassification DSDP/ODP/IODP sample designation DEPTH, sediment/rock physicalMeasurement m m δ18O, carbonate physicalMeasurement fine fraction <38 µm ‰ PDB ‰ PDB δ13C, carbonate physicalMeasurement fine fraction <38 µm ‰ PDB ‰ PDB Iridium physicalMeasurement ng/kg ng/kg Smectite physicalMeasurement % % Illite physicalMeasurement % % Chlorite physicalMeasurement % % Calcium carbonate physicalMeasurement % % Microcarbonate physicalMeasurement % % Nannofossils, tertiary physicalMeasurement % % text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.758528?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 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 * METHOD/DEVICE: Drilling/drill rig 35 cores; 337.2 m cored; 0 m drilled; 43.3 % recovery 1988-01-11T18:45:00