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Robinson, Nicole; Ravizza, Gregory E; Coccioni, Rodolfo; Peucker-Ehrenbrink, Bernhard; Norris, Richard D (2009): Marine osmium isotope record across the Cretaceous-Tertiary boundary [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.785723, Supplement to: Robinson, N et al. (2009): A high-resolution marine 187Os/188Os record for the late Maastrichtian: Distinguishing the chemical fingerprints of Deccan volcanism and the KP impact event. Earth and Planetary Science Letters, 281(3-4), 159-168, https://doi.org/10.1016/j.epsl.2009.02.019

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Published: 2009 (exact date unknown) • DOI registered: 2012-08-06

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Abstract:
A composite late Maastrichtian (65.5 to 68.5 Ma) marine osmium (Os) isotope record, based on samples from the Southern Ocean (ODP Site 690), the Tropical Pacific Ocean (DSDP Site 577), the South Atlantic (DSDP Site 525) and the paleo-Tethys Ocean demonstrates that subaerially exposed pelagic carbonates can record seawater Os isotope variations with a fidelity comparable to sediments recovered from the seafloor. New results provide robust evidence of a 20% decline in seawater 187Os/188Os over a period of about 200 kyr early in magnetochron C29r well below the Cretaceous-Paleogene Boundary (KPB), confirming previously reported low-resolution data from the South Atlantic Ocean. New results also confirm a second more rapid decline in 187Os/188Os associated with the KPB that is accompanied by a significant increase in Os concentrations. Complementary platinum (Pt) and iridium (Ir) concentration data indicate that the length scale of diagenetic remobilization of platinum group elements from the KPB is less than 1 m and does not obscure the pre-KPB decline in 187Os/188Os. Increases in bulk sediment Ir concentrations and decreases in bulk carbonate content that coincide with the Os isotope shift suggest that carbonate burial flux may have been lower during the initial decline in 187Os/188Os. We speculate that diminished carbonate burial rate may have been the result of ocean acidification caused by Deccan volcanism.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -9.224246 * Median Longitude: 42.763442 * South-bound Latitude: -65.160000 * West-bound Longitude: 1.204800 * North-bound Latitude: 43.360000 * East-bound Longitude: 157.723233
Date/Time Start: 1980-06-10T00:00:00 * Date/Time End: 1987-01-23T20:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S7) Os/Ir and Pt/Ir ratios in DSDP Hole 74-525A. https://doi.org/10.1594/PANGAEA.785720
  2. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S4) Os isotope and platinum group element content in DSDP Site 86-577. https://doi.org/10.1594/PANGAEA.785713
  3. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S3) Calcium carbonate content in ODP Hole 113-690C and DSDP Site 86-577. https://doi.org/10.1594/PANGAEA.785712
  4. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S2) Major element composition of ODP Hole 113-690C sediments. https://doi.org/10.1594/PANGAEA.785711
  5. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S5) Os isotope and platinum group element content in ODP Hole 113-690C. https://doi.org/10.1594/PANGAEA.785718
  6. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S8) Re-Os analyses of sediment leaches and associated age corrections for ODP Hole 113-690C and DSDP Holes 86-577A and 74-525A. https://doi.org/10.1594/PANGAEA.785721
  7. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S6) Os isotope and platinum group element content in the Bottaccione Section, Gubbio. https://doi.org/10.1594/PANGAEA.785719
  8. Robinson, N; Ravizza, GE; Coccioni, R et al. (2009): (Table S8) Re-Os analyses of sediment leaches and associated age corrections for the Bottaccione Section, Gubbio. https://doi.org/10.1594/PANGAEA.785722