Igneous and Sedimentary Rocks Dredged from the Northern Macquarie Ridge

A collection of rock samples dredged from a previously unsampled portion of the Macquarie Ridge between 47° and 48° S. The rocks include altered basalt, dolerite, and gabbro, and were collected using the commercial fishing vessel Amaltal Explorer. The data was published by Geoscience Australia Data and was last updated on 2026-05-14.

Use Cases

• Petrographic analysis based on descriptions of altered basalt, dolerite, and gabbro.
• Geochemical comparison based on the MORB-like petrological affinity mentioned for the mafic-ultramafic suites.
• Tectonic provenance studies based on the mix of oceanic ridge and continental New Zealand sources for sedimentary rocks.
• Bathymetric and geological correlation studies based on the relationship between the Puysegur Bank and the rest of the ridge.

Strengths

• Samples were collected from a previously unsampled portion of the Macquarie Ridge.
• The description provides specific petrographic and geochemical context, comparing the rocks to known MORB-like suites.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data is provided in PDF and HTML formats, which may require extraction for computational analysis.

Provenance

Source

Geoscience Australia Data

Collection Method

Dredged from the seafloor using the commercial fishing vessel Amaltal Explorer.

Freshness

Last updated 2026-05-14 05:11:15.487434; freshness should be verified.

Geography

Northern Macquarie Ridge, Southern Ocean, specifically between 47° and 48° S.