Northern Lord Howe Rise submarine volcanic cones were mapped and dredged at 23-24°S, about 120 km apart. Dredged rocks include altered hyaloclastites and basalt, with interbedded micrites dated to the late Early Miocene (~16 Ma). Ferromanganese crusts up to 7 cm thick were sampled, with chemical analyses showing variations between the northern and southern cones.
Use Cases
- Analyze volcanic rock composition based on descriptions of hyaloclastites, basalt, and clinopyroxene phenocrysts
- Model ferromanganese crust growth rates based on the reported average of 3 mm/m.y.
- Study paleoenvironmental changes based on foraminifera indicating cool water deposition in the Early Miocene and warm water in the Late Miocene/Pliocene
- Correlate seamount locations with gravity highs to predict fields of small volcanic cones as suggested in the description
Strengths
- Includes specific geochemical data for ferromanganese crusts, such as copper (up to 0.08 wt%), nickel (up to 0.65%), and cobalt (up to 0.25%)
- Provides precise temporal context with micrite dating to late Early Miocene (~16 Ma)
- Contains detailed spatial coordinates for two dredged cones at 23-24°S, 120 km apart, with water depths of 750 m and 900 m
Limitations
- Column-level documentation is absent; field semantics must be inferred after download
- Row count is unknown, which may limit suitability assessment
Provenance
- Source
- Australian Ocean Data Network
- Collection Method
- Multibeam sonar swath-mapping and dredging operations
- Time Range
- Late Early Miocene (~16 Ma) to Pliocene
- Freshness
- Last updated 2026-04-16 15:34:55.052517; freshness should be verified
- Geography
- Northern Lord Howe Rise, at 23-24°S