Cretaceous-Paleogene Boundary Stratigraphy from Lord Howe Rise Cores

Sediment cores from 540-590 meters below seafloor at DSDP Site 208 on the Lord Howe Rise provide stratigraphic data across the Cretaceous-Paleogene boundary. The dataset includes biostratigraphic, magnetostratigraphic, and geochemical measurements such as carbonate carbon isotopes (δ13Ccarb) and osmium concentrations. It was published in GSA Bulletin in 2021 by researchers including Junichiro Kuroda.

Use Cases

• Correlating the K/Pg boundary using osmium isotopic composition (187Os/188Os) and concentration peaks in sediment cores.
• Analyzing the global carbon cycle shift via the negative excursion in carbonate carbon isotopic composition (δ13Ccarb) across the boundary interval.
• Refining age models by integrating calcareous nannofossil biostratigraphy with magnetostratigraphic data from Site 208 cores.
• Assessing sediment deposition continuity around the K/Pg boundary using biostratigraphic indicators from the Maastrichtian to Danian/Selandian.

Strengths

• Multi-proxy dataset combining biostratigraphic, magnetostratigraphic, and geochemical data.
• Core samples span a 50-meter interval (540-590 mbsf) capturing Late Cretaceous to Paleocene sediments.
• Osmium isotopic data provides a specific marker with values reported between 0.12-0.16.

Limitations

• Sample size for key geochemical markers like osmium concentration is low, with one sample noted at <80 pg g-1.
• The study suggests the sedimentary record across the K/Pg boundary at Site 208 may not be completely continuous.
• Specific row and column counts, data formats, and sample sizes are not provided in the description.

Provenance

Source

Australian Ocean Data Network, derived from Deep Sea Drilling Project Leg 21, Site 208.

Collection Method

Analysis of sediment cores, including biostratigraphy, magnetostratigraphy, and geochemical measurements.

Time Range

Late Cretaceous (Maastrichtian) to Paleocene (Danian and Selandian).

Freshness

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Geography

Lord Howe Rise, Southwest Pacific, DSDP Site 208.