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Hot-spot volcanism in St Andrew Strait, Papua New Guinea: geochemistry of a Quaternary bimodal rock suite

Created 17/10/2025

Updated 17/10/2025

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Four distinct volcanic rock types are found above a conjectured mantle hot spot in St Andrew Strait, northern Papua New Guinea. Hypersthene-normative basalts on Baluan Island are geochemically similar in most respects to those on oceanic islands and, together with voluminous alkali-rich rhyolites on Tuluman, Lou, and Pam Islands, constitute a strongly bimodal rock suite. The rhyolites are regarded as partial melts of basaltic crust isotopically similar to the basalts of Baluan, though with lower Sr, Rb, and Ba contents. In contrast, quartz-tholeiite basalts in the Fedarb Islands are isotopically distinct from the Baluan basalts. Dacite is also present in the Fedarb Islands, but not all of its geochemical features are consistent with a derivation by crystal fractionation from Fedarb quartz tholeiite. Like Iceland, St Andrew Strait may be underlain by a hot mantle diapir that has produced basaltic magmas as well as partial melting of basaltic crust.

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Title Hot-spot volcanism in St Andrew Strait, Papua New Guinea: geochemistry of a Quaternary bimodal rock suite
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/8f954211-3421-4a38-ad22-dea2b51b00b8
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        147.2,
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      ],
      [
        147.5,
        -2.6
      ],
      [
        147.5,
        -2.3
      ],
      [
        147.2,
        -2.3
      ],
      [
        147.2,
        -2.6
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Hot-spot volcanism in St Andrew Strait, Papua New Guinea: geochemistry of a Quaternary bimodal rock suite". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/hot-spot-volcanism-in-st-andrew-strait-papua-new-guinea-geochemistry-of-a-quaternary-bimodal-ro