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Late Proterozoic peralkaline intrusives of the Alligator Rivers region, Northern Territory

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Created 20/01/2025

Updated 20/01/2025

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The Mudginberri and Maningkorrirr Phonolites in the Alligator Rivers region consist of swarms of discordant peralkaline dykes that intrude Archaean to late Early Proterozoic rocks. Samples have given a Rb-Sr isotopic age of 1316 Ma. The dykes are phonolitic in composition and typically porphyritic, containing alkali feldspar, nepheline, sodic pyroxene, and minor biotite and apatite. In some small globules of mostly alkali feldspar may be products of liquid immiscibility. The dykes intrude part of the stable North Australian Craton and may represent late differentiates of concealed alkaline magma, as there are no other alkaline intrusive rocks known in the region. Alternatively, they may have formed by incipient melting in the upper mantle and deep crust.

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Title Late Proterozoic peralkaline intrusives of the Alligator Rivers region, Northern Territory
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/4faa7ca8-9cf7-4bf4-b342-4414b2acdd0f
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[131.65, -14.22], [134.29, -14.22], [134.29, -11.99], [131.65, -11.99], [131.65, -14.22]]]}
Data Portal data.gov.au