Marine geology of the continental shelf off southeast Australia

The continental shelf width varies from 72 km east of Newcastle to 17 km east of Montague Island, with distinct inner, middle, and outer zones defined by morphology and sediment type. This dataset from the Australian Ocean Data Network, last updated in 2026, describes submarine canyons, sediment wedges, and the distribution of terrigenous and carbonate sediments across the shelf. It includes analysis of basement structures, heavy mineral suites, and the likely relict nature of most shelf sediments.

Use Cases

• Modeling shelf morphology and basement correlation based on described depth zones and terrace groups.
• Analyzing sediment distribution patterns based on described terrigenous and carbonate components.
• Studying geological processes like tilting and progradation based on the described sediment wedge and unconformity.
• Mapping heavy mineral suites for provenance studies based on the described amphibole-pyroxene-epidote and tourmaline-rutile-zircon distributions.

Strengths

• Description provides specific spatial measurements, such as shelf widths of 72 km and 17 km and depth zones from 60m to 140m.
• Includes detailed geological features like ten submarine canyons, an unconformity (SI), and basement highs/lows.
• Covers a defined geographic region between Sugarloaf Point and Gabo Island, New South Wales.

Limitations

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

Provenance

Source

Australian Ocean Data Network

Collection Method

Likely contains findings from marine geological surveys and seismic profiling.

Time Range

Likely includes modern observations and inferences about processes since the Late Cretaceous.

Freshness

Last updated 2026-04-10 22:20:29.056501; freshness should be verified.

Geography

Continental shelf off southeast Australia between Sugarloaf Point and Gabo Island, New South Wales.