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A mica, pyroxene, ilmenite megacryst-bearing lamprophyre from Mt Woolooma, northeastern New South Wales

Created 17/10/2025

Updated 17/10/2025

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A narrow lamprophyre dyke, dated at 85 Ma, intrudes Early Carboniferous sediments at Mount Woolooma in northeast New South Wales. The lamprophyre contains megacrysts of titanbiotite (Mg18-21, 7-8% TiO2) and rare Ti-Al salite (Mg67-72 , 6-9% Al2O3), ilmenite (5% MgO), titanphlogopite (Mg61 , 9% TiO2) and apatite. The host rock consists of lamprophyric-textured titanphlogopite (Mg62-70, 7-8% TiO2), diopside-salite, olivine, kaersutite, and Ti-magnetite in a K-feldspar-rich base. The rock resembles a minette (mica-lamprophyre), but its bulk composition is richer in SiO2 and Al2O3 (53-54% SiO2 anhydrous, ~ 16% AI2O3), and poorer in MgO (3%), Ni and Cr (30 ppm) than many minettes elsewhere. The Mount Woolooma minette forms part of a diverse assemblage of alkaline igneous rocks from the Scone-Gloucester area. These include alkali olivine basalt, teschenite, biotite alnoite, kimberlite, and leucite monchiquite, many of which carry mantle xenoliths/xenocrysts and/or megacrysts.

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Title A mica, pyroxene, ilmenite megacryst-bearing lamprophyre from Mt Woolooma, northeastern New South Wales
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/cc8a6238-6fca-4911-a5b5-d7009d6a0b87
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        149.71,
        -31.82
      ],
      [
        151.82,
        -31.82
      ],
      [
        151.82,
        -30.16
      ],
      [
        149.71,
        -30.16
      ],
      [
        149.71,
        -31.82
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "A mica, pyroxene, ilmenite megacryst-bearing lamprophyre from Mt Woolooma, northeastern New South Wales". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/a-mica-pyroxene-ilmenite-megacryst-bearing-lamprophyre-from-mt-woolooma-northeastern-new-south-