Vonhof, Hubert B; Smit, Jan; Brinkhuis, Henk; Montanari, Alessandro; Nederbragt, Alexandra J (2000): Carbon and oxygen isotope data for carbonates and benthic foraminifers from ODP Hole 113-689B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.713007, Supplement to: Vonhof, HB et al. (2000): Global cooling accelerated by early late Eocene impacts? Geology, 28(8), 687-690, https://doi.org/10.1130/0091-7613(2000)28%3C687:GCABEL%3E2.0.CO;2
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Abstract:
At Ocean Drilling Program Site 689 (Maud Rise, Southern Ocean), d18O records of fine-fraction bulk carbonate and benthic foraminifers indicate that accelerated climate cooling took place following at least two closely spaced early late Eocene extraterrestrial impact events. A simultaneous surface-water productivity increase, as interpreted from d13C data, is explained by enhanced water-column mixing due to increased latitudinal temperature gradients. These isotope data appear to be in concert with organic-walled dinoflagellate-cyst records across the same microkrystite-bearing impact-ejecta layer in the mid-latitude Massignano section (central Italy). In particular, the strong abundance increase of Thalassiphora pelagica is interpreted to indicate cooling or increased productivity at Massignano. Because impact-induced cooling processes are active on time scales of a few years at most, the estimated 100 k.y. duration of the cooling event appears to be too long to be explained by impact scenarios alone. This implies that a feedback mechanism, such as a global albedo increase due to extended snow and ice cover, may have sustained impact-induced cooling for a longer time after the impacts.
Further details:
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -64.517000 * Longitude: 3.099900
Date/Time Start: 1987-01-16T08:00:00 * Date/Time End: 1987-01-18T06:45:00
Event(s):
113-689B * Latitude: -64.517000 * Longitude: 3.099900 * Date/Time Start: 1987-01-16T08:00:00 * Date/Time End: 1987-01-18T06:45:00 * Elevation: -2091.0 m * Penetration: 297.3 m * Recovery: 229.45 m * Location: South Atlantic Ocean * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 297.3 m cored; 0 m drilled; 77.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Vonhof, HB; Smit, J; Brinkhuis, H et al. (2000): Carbon and oxygen isotope data of ODP Hole 113-689B carbonates, <63 µm fraction. https://doi.org/10.1594/PANGAEA.713005
- Vonhof, HB; Smit, J; Brinkhuis, H et al. (2000): (Table 2) Carbon and oxygen isotope data for benthic foraminifers from ODP Hole 113-689B. https://doi.org/10.1594/PANGAEA.713006