Igneous and Sedimentary Rocks Dredged from the Northern Macquarie Ridge

Geoscience Australia Data published a geological note on rock samples dredged from the northern Macquarie Ridge in the Southern Ocean. The dataset includes altered basalt, dolerite, gabbro, and sedimentary rocks collected from a previously unsampled area between 47° and 48° S. The data was last updated on 2026-03-25.

Use Cases

• Classifying rock types based on petrographic and geochemical descriptions.
• Analyzing the geological relationship between the northern Macquarie Ridge and the rest of the ridge system.
• Investigating sediment provenance based on descriptions of oceanic and continental sources.
• Testing tectonic models for the region based on the absence of evidence for subduction-related magmatism.

Strengths

• Data covers a previously unsampled portion of the Macquarie Ridge (47°-48° S).
• Rocks are described with petrographic and geochemical similarity to known MORB-like suites.
• Explicitly notes the absence of evidence for subduction-related magmatism.

Limitations

• Row count and column-level documentation are absent; field semantics must be inferred after download.
• Data may reflect geographic bias inherent to the specific dredge locations.

Provenance

Source

Geoscience Australia Data

Collection Method

Rocks were dredged using the commercial fishing vessel Amaltal Explorer.

Freshness

Last updated 2026-03-25 18:50:12.472481; freshness should be verified.

Geography

Northern Macquarie Ridge, Southern Ocean (47°-48° S, Puysegur Bank).