Rock Samples from Northern Macquarie Ridge in the Southern Ocean

Dredged rock samples from the northern Macquarie Ridge (47°-48° S) in the Southern Ocean. The collection includes altered basalt, dolerite, gabbro, and sedimentary rocks, analyzed for petrographic and geochemical properties. Data was contributed by the Australian Ocean Data Network and last updated in April 2026.

Use Cases

• Classify rock types (e.g., altered basalt, dolerite, gabbro) based on petrographic descriptions.
• Analyze geochemical signatures to determine MORB-like petrological affinity of mafic-ultramafic suites.
• Correlate sedimentary rock compositions to identify source regions (oceanic Macquarie Ridge vs. continental New Zealand).
• Assess geological relationships between the northern Puysegur Bank and the southern Macquarie Ridge sections.

Strengths

• Data covers a previously unsampled portion of the Macquarie Ridge (47°-48° S).
• Findings are compared against samples from a wider latitudinal range (49° to 58° S) collected by previous investigators.

Limitations

• Sample size and specific row count for rock specimens are not provided.
• Primary data formats (PDF, HTML) are not structured for direct computational analysis.
• Temporal range for sample collection is unspecified.

Provenance

Source

Australian Ocean Data Network

Collection Method

Rocks dredged using the commercial fishing vessel Amaltal Explorer.

Time Range

null

Freshness

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Geography

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