Ando, Atsushi; Kaiho, Kunio; Kawahata, Hodaka; Kakegawa, Takeshi (2008): Stable carbon and oxygen isotope ratios of bulk sediment from DSDP Hole 62-463 (Appendix A) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.706068, Supplement to: Ando, A et al. (2008): Timing and magnitude of early Aptian extreme warming: Unraveling primary d18O variation in indurated pelagic carbonates at Deep Sea Drilling Project Site 463, central Pacific Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology, 260(3-4), 463-476, https://doi.org/10.1016/j.palaeo.2007.12.007
Always quote citation above when using data! You can download the citation in several formats below.
Published: 2008-10-16 • DOI registered: 2008-11-13
Abstract:
In order to elucidate early Aptian marine paleotemperature evolution across the period of enhanced organic carbon (Corg)-burial [Oceanic Anoxic Event (OAE) 1a], stable isotope analyses were performed on pelagic limestones at Deep Sea Drilling Project Site 463, central Pacific Ocean. The delta18O data exhibit a distinct anomaly by ~-2 per mil spanning the OAE 1a interval (i.e., a ~6 m-thick, phytoplanktonic Corg-rich unit constrained by magneto-, bio- and delta13C stratigraphy). Elucidation of paleotemperature significance of the delta18O shift is made by taking account of recent Sr/Ca evidence at the same section, which revealed that geochemical signals in carbonate-poor lithologies are relatively unaltered against burial diagenesis. By discriminating delta18O values from carbonate-poor samples (CaCO3 contents=5-30 wt.%), it appears that an abrupt rise in seasurface temperatures (SSTs) by 8 °C (=-1.7 per mil shift in delta18O) occurred immediately before OAE 1a, whereas a cooling mode likely prevailed during the peak Corg-burial. In terms of its stratigraphic relationship as to the Corg-rich interval and to a pronounced negative delta13C excursion, as well as its timescale, the observed SST rise resembles those associated with the Paleocene-Eocene thermal maximum and, more strikingly, Jurassic Toarcian OAE. This observation is consistent with the hypothesis that these paleoenvironmental events were driven by a common causal mechanism, which was likely initiated by the greenhouse effect via massive release of CH4 or CO2 from the isotopically-light carbon reservoir and terminated by a negative productivity feedback.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 21.350200 * Longitude: 174.667800
Date/Time Start: 1978-08-02T00:00:00 * Date/Time End: 1978-08-02T00:00:00
Minimum DEPTH, sediment/rock: 566.40 m * Maximum DEPTH, sediment/rock: 653.38 m
Event(s):
62-463 * Latitude: 21.350200 * Longitude: 174.667800 * Date/Time: 1978-08-02T00:00:00 * Elevation: -2525.0 m * Penetration: 822.5 m * Recovery: 305.5 m * Location: North Pacific/SEAMOUNT * Campaign: Leg62 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 92 cores; 820.5 m cored; 0 m drilled; 37.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Ando, Atsushi | DSDP/ODP/IODP sample designation | ||
| 3 | Lithology/composition/facies | Lithology | Ando, Atsushi | |||
| 4 | δ18O, carbonate | δ18O carb | ‰ PDB | Ando, Atsushi | Isotope ratio mass spectrometry | |
| 5 | δ13C, carbonate | δ13C carb | ‰ PDB | Ando, Atsushi | Isotope ratio mass spectrometry | |
| 6 | Sample comment | Sample comment | Ando, Atsushi | RT = Rutgers University (Micromass Optima mass spectrometer), TH = Tohoku University (Finnigan MAT Delta S mass spectrometer) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
260 data points