Late Neogene Ice Drainage Changes in Prydz Bay, East Antarctica

Ocean Drilling Program data indicates a major compositional shift in debris flow deposits around 1.1 million years before present. The dataset, from Geoscience Australia, describes changes in the Lambert Glacier-Amery Ice Shelf drainage system during the late Neogene, including the deposition of a trough mouth fan prior to the Brunhes Matuyama Boundary (780 ka BP). It provides stratigraphic evidence for the evolution of ice discharge patterns and their interaction with climate cycles.

Use Cases

• Modeling past ice sheet dynamics based on described changes in flow patterns and erosion depth.
• Analyzing the relationship between glacial-interglacial cycles and ice discharge based on the mid-Pleistocene transition to 100 ka cycles.
• Reconstructing paleoenvironmental conditions from the composition and timing of debris flow deposits in the trough mouth fan.
• Studying sediment provenance shifts based on the change from Lambert Graben-derived to basement-derived material around 1.1 Ma BP.

Strengths

• Provides age control from Ocean Drilling Program data, including the Brunhes Matuyama Boundary (780 ka BP).
• Describes a specific compositional change in debris at around 1.1 million years before present.
• Focuses on a defined geographic region (Prydz Bay, Lambert Glacier system) and time period (late Neogene).

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

Geoscience Australia Data

Collection Method

Likely derived from Ocean Drilling Program core samples and geological analysis.

Time Range

Late Neogene, with specific events noted in the Early Pliocene and around 1.1 Ma BP.

Freshness

Last updated 2026-04-30 14:39:59.036107; freshness should be verified.

Geography

Prydz Bay and the Lambert Glacier-Amery Ice Shelf system, East Antarctica.